Question : The number of significant figures in 0.004050 is
2
3
4
5
Correct Answer : 4
Question : Which quantum number determines the orientation of an orbital in space?
Principal quantum number
Azimuthal quantum number
Magnetic quantum number
Spin quantum number
Correct Answer : Magnetic quantum number
Question : A gas occupies 2.0 L at 1 atm and 300 K. What volume will it occupy at 2 atm and 600 K?
1.0 L
2.0 L
3.0 L
4.0 L
Correct Answer : 2.0 L
Question : For a first-order reaction, the half-life is 20 minutes. The time required for 87.5% completion of the reaction is
20 min
40 min
60 min
80 min
Correct Answer : 60 min
Question : Which of the following has the highest lattice enthalpy?
NaCl
MgO
KCl
CaO
Correct Answer : CaO
Question : The pH of a 0.001 M HCl solution is
1
2
3
4
Correct Answer : 3
Question : In the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), addition of an inert gas at constant volume will
Shift the equilibrium towards NH3
Shift the equilibrium towards N2 and H2
Not affect the equilibrium composition
Increase the equilibrium constant
Correct Answer : Not affect the equilibrium composition
Question : The oxidation state of chromium in K2Cr2O7 is
+3
+4
+6
+7
Correct Answer : +6
Question : Which of the following complexes exhibits geometrical isomerism?
[Co(NH3)6]3+
[Pt(NH3)2Cl2]
[Zn(NH3)4]2+
[Co(en)3]3+
Correct Answer : [Pt(NH3)2Cl2]
Question : Which element has the highest first ionisation enthalpy among the following?
B
C
N
O
Correct Answer : N
Question : The hybridisation of carbon atoms in benzene is
sp
sp2
sp3
sp3d
Correct Answer : sp2
Question : Which reagent is most suitable for converting propan-1-ol into propene?
Concentrated H2SO4, heat
Dilute H2SO4, room temperature
NaOH(aq)
H2/Pd
Correct Answer : Concentrated H2SO4, heat
Question : The major product formed when propene reacts with HBr in the absence of peroxide is
1-bromopropane
2-bromopropane
1,2-dibromopropane
2-bromopropanol
Correct Answer : 2-bromopropane
Question : Which of the following compounds gives a positive iodoform test?
Methanol
Ethanol
Propan-1-ol
Propan-2-ol
Correct Answer : Ethanol
Question : Which of the following is the strongest acid?
CH3COOH
ClCH2COOH
Cl2CHCOOH
Cl3CCOOH
Correct Answer : Cl3CCOOH
Question : The monomer used in the manufacture of natural rubber is
Ethene
Styrene
Isoprene
Vinyl chloride
Correct Answer : Isoprene
Question : Which of the following vitamins is water-soluble?
Vitamin A
Vitamin D
Vitamin E
Vitamin C
Correct Answer : Vitamin C
Question : A solution contains 0.1 mol of glucose dissolved in 900 g of water. Its molality is approximately
0.011 m
0.111 m
1.11 m
11.1 m
Correct Answer : 0.111 m
Question : Which colligative property is most suitable for determining the molar mass of proteins?
Relative lowering of vapour pressure
Elevation in boiling point
Depression in freezing point
Osmotic pressure
Correct Answer : Osmotic pressure
Question : If ΔH for a reaction is positive and ΔS is positive, the reaction is spontaneous
At all temperatures
Only at low temperatures
Only at high temperatures
At no temperature
Correct Answer : Only at high temperatures
Question : The electrode potential of a standard hydrogen electrode is
+1.00 V
0.00 V
−1.00 V
+0.059 V
Correct Answer : 0.00 V
Question : During electrolysis of molten NaCl, the product formed at the cathode is
Cl2
Na
NaOH
H2
Correct Answer : Na
Question : Which of the following ions is diamagnetic?
Fe2+
Co2+
Ni2+
Zn2+
Correct Answer : Zn2+
Question : The shape of XeF4 molecule is
Tetrahedral
Trigonal bipyramidal
Square planar
See-saw
Correct Answer : Square planar
Question : Which of the following oxides is amphoteric?
Na2O
MgO
Al2O3
SO2
Correct Answer : Al2O3
Question : The bond order of O2 molecule according to molecular orbital theory is
1
1.5
2
2.5
Correct Answer : 2
Question : Which of the following species has the largest ionic radius?
Na+
Mg2+
F−
O2−
Correct Answer : O2−
Question : The major product obtained on hydration of ethyne in the presence of HgSO4 and H2SO4 is
Ethanol
Ethanal
Ethene
Ethanoic acid
Correct Answer : Ethanal
Question : Which of the following compounds undergoes Cannizzaro reaction?
CH3CHO
C6H5CHO
CH3CH2CHO
CH3COCH3
Correct Answer : C6H5CHO
Question : Which of the following is an example of a condensation polymer?
Polythene
PVC
Teflon
Nylon-6,6
Correct Answer : Nylon-6,6
Question : The major product of nitration of nitrobenzene is
o-Dinitrobenzene
m-Dinitrobenzene
p-Dinitrobenzene
Benzene diazonium nitrate
Correct Answer : m-Dinitrobenzene
Question : Which reagent can distinguish between aldehydes and ketones?
NaBH4
Tollens' reagent
LiAlH4
H2/Ni
Correct Answer : Tollens' reagent
Question : The number of unpaired electrons in Mn2+ is
1
3
5
7
Correct Answer : 5
Question : Which of the following statements about an ideal gas is correct?
Its molecules have significant intermolecular forces
Its molecules occupy appreciable volume
It obeys PV = nRT under all conditions
Its molecules are stationary
Correct Answer : It obeys PV = nRT under all conditions
Question : For the equilibrium CaCO3(s) ⇌ CaO(s) + CO2(g), the equilibrium constant Kp is
P(CO2)
1/P(CO2)
P(CaO)P(CO2)/P(CaCO3)
P(CaCO3)/P(CaO)
Correct Answer : P(CO2)
Question : The unit of rate constant for a second-order reaction is
s−1
mol L−1 s−1
L mol−1 s−1
L2 mol−2 s−1
Correct Answer : L mol−1 s−1
Question : Which of the following is a characteristic of an SN1 reaction?
It occurs in a single elementary step
Its rate depends only on substrate concentration
It favours primary alkyl halides strongly
It proceeds through a carbanion intermediate
Correct Answer : Its rate depends only on substrate concentration
Question : Which of the following has the highest boiling point?
CH3CH2CH3
CH3OCH3
CH3CH2OH
CH3CHO
Correct Answer : CH3CH2OH
Question : The correct increasing order of acidic strength is
H2O < NH3 < CH4
CH4 < NH3 < H2O
NH3 < CH4 < H2O
CH4 < H2O < NH3
Correct Answer : CH4 < NH3 < H2O
Question : Which of the following compounds contains both ionic and covalent bonds?
CH4
NaCl
NH4Cl
Cl2
Correct Answer : NH4Cl
Question : The magnetic moment of a species having three unpaired electrons is approximately
1.73 BM
2.83 BM
3.87 BM
5.92 BM
Correct Answer : 3.87 BM
Question : Which of the following is the strongest reducing agent among alkali metals in aqueous solution?
Li
Na
K
Cs
Correct Answer : Li
Question : The oxidation of a primary alcohol under controlled conditions generally gives
Ketone
Aldehyde
Ether
Ester
Correct Answer : Aldehyde
Question : Which of the following is an electron-deficient molecule?
CH4
NH3
BF3
H2O
Correct Answer : BF3
Question : The number of atoms present in 0.5 mol of helium is approximately
1.505 × 10^23
3.011 × 10^23
6.022 × 10^23
12.044 × 10^23
Correct Answer : 3.011 × 10^23
Question : Which of the following compounds shows optical isomerism?
2-propanol
2-butanol
2-methylpropan-2-ol
Ethanol
Correct Answer : 2-butanol
Question : The coordination number of Co in [Co(NH3)6]Cl3 is
3
4
6
9
Correct Answer : 6
Question : Which of the following is NOT a property of transition elements?
Variable oxidation states
Formation of coloured ions
Formation of complex compounds
Complete absence of catalytic activity
Correct Answer : Complete absence of catalytic activity
Question : The major product of the reaction of benzene with CH3Cl in the presence of anhydrous AlCl3 is
Chlorobenzene
Toluene
Ethylbenzene
Benzyl chloride
Correct Answer : Toluene
Question : Which of the following carbohydrates is a non-reducing sugar?
Glucose
Fructose
Maltose
Sucrose
Correct Answer : Sucrose
Question : A buffer solution contains equal concentrations of a weak acid and its conjugate base. If pKa of the acid is 4.76, the pH of the buffer is
2.38
4.76
7.00
9.52
Correct Answer : 4.76
Question : Which of the following gases deviates most from ideal behaviour at low temperature and high pressure?
H2
He
NH3
Ne
Correct Answer : NH3
Question : In an electrochemical cell, electrons flow through the external circuit from
Cathode to anode
Anode to cathode
Salt bridge to cathode
Cathode to salt bridge
Correct Answer : Anode to cathode
Question : The IUPAC name of CH3CH(CH3)CH2OH is
2-methylpropan-1-ol
2-methylpropan-2-ol
3-methylpropan-1-ol
Butan-2-ol
Correct Answer : 2-methylpropan-1-ol
Question : Which of the following reactions is an example of disproportionation?
Zn + CuSO4 → ZnSO4 + Cu
2H2O2 → 2H2O + O2
HCl + NaOH → NaCl + H2O
CaCO3 → CaO + CO2
Correct Answer : 2H2O2 → 2H2O + O2
Question : The enthalpy change for formation of one mole of a compound from its constituent elements in their standard states is called
Bond enthalpy
Lattice enthalpy
Standard enthalpy of formation
Ionisation enthalpy
Correct Answer : Standard enthalpy of formation
Question : Which of the following compounds reacts fastest with aqueous AgNO3?
CH3Cl
CH3CH2Cl
(CH3)2CHCl
(CH3)3CCl
Correct Answer : (CH3)3CCl
Question : The number of sigma and pi bonds in benzene is
6 sigma, 6 pi
12 sigma, 3 pi
9 sigma, 3 pi
12 sigma, 6 pi
Correct Answer : 12 sigma, 3 pi
Question : Which of the following elements has the highest electronegativity?
F
Cl
O
N
Correct Answer : F
Question : A 10% w/w solution of NaOH contains
10 g NaOH in 100 g solution
10 g NaOH in 100 mL solution
10 mol NaOH in 100 g solution
10 g NaOH in 1 L solution
Correct Answer : 10 g NaOH in 100 g solution
Question : Which of the following is the correct order of stability of carbocations?
CH3+ > 1° > 2° > 3°
3° > 2° > 1° > CH3+
1° > 2° > 3° > CH3+
2° > 3° > 1° > CH3+
Correct Answer : 3° > 2° > 1° > CH3+
Question : The major product formed when 2-bromobutane is heated with alcoholic KOH is
Butan-1-ol
But-1-ene
But-2-ene
Butane
Correct Answer : But-2-ene
Question : Which of the following statements about hydrogen bonding is correct?
It occurs only between identical molecules
It is weaker than van der Waals forces in all cases
It significantly affects the boiling point of water
It requires a metal atom
Correct Answer : It significantly affects the boiling point of water
Question : The common ion effect is best illustrated by the decrease in solubility of AgCl when
HNO3 is added
AgNO3 is added
NH3 is added
Water is added
Correct Answer : AgNO3 is added
Question : Which of the following species is isoelectronic with Ne?
Na+
Mg2+
F−
All of these
Correct Answer : All of these
Question : In the extraction of aluminium by electrolysis, cryolite is added primarily to
Oxidise aluminium ions
Lower the melting point of alumina
Increase the density of aluminium
Prevent oxidation of aluminium
Correct Answer : Lower the melting point of alumina
Question : Which of the following is used as a catalyst in the Haber process?
Fe
Ni
V2O5
Pt
Correct Answer : Fe
Question : The major product of oxidation of propan-2-ol with acidified K2Cr2O7 is
Propanal
Propanoic acid
Propanone
Ethanone
Correct Answer : Propanone
Question : Which of the following compounds has the maximum number of lone pairs on its central atom?
NH3
H2O
BF3
CH4
Correct Answer : H2O
Question : The standard Gibbs energy change for a spontaneous reaction under standard conditions is
Positive
Zero
Negative
Always equal to ΔH
Correct Answer : Negative
Question : Which of the following will have the highest osmotic pressure at the same temperature and concentration, assuming complete dissociation?
Glucose
NaCl
CaCl2
Al2(SO4)3
Correct Answer : Al2(SO4)3
Question : Which of the following compounds is aromatic?
Cyclobutane
Cyclooctatetraene
Cyclopentadienyl anion
Cyclopentadienyl cation
Correct Answer : Cyclopentadienyl anion
Question : The major product when aniline reacts with bromine water is
Bromobenzene
p-Bromoaniline
2,4,6-Tribromoaniline
m-Bromoaniline
Correct Answer : 2,4,6-Tribromoaniline
Question : Which of the following is a Lewis acid?
NH3
OH−
BF3
Cl−
Correct Answer : BF3
Question : If 2 mol of an ideal gas expands isothermally and reversibly from 10 L to 20 L at 300 K, the work done by the gas is approximately
−3.46 kJ
+3.46 kJ
−6.92 kJ
+6.92 kJ
Correct Answer : +3.46 kJ
Question : Which of the following elements forms the most stable +1 oxidation state due to the inert pair effect?
Tl
Al
Ga
B
Correct Answer : Tl
Question : The reaction of phenol with CHCl3 and NaOH followed by acidification gives mainly
Benzoic acid
Salicylaldehyde
Benzaldehyde
Salicylic acid
Correct Answer : Salicylaldehyde
Question : Which of the following has the lowest bond dissociation enthalpy?
F2
Cl2
Br2
I2
Correct Answer : I2
Question : In a galvanic cell, if E°cell is positive, then
ΔG° is positive
The cell reaction is spontaneous under standard conditions
K is always less than 1
The cell cannot produce electrical energy
Correct Answer : The cell reaction is spontaneous under standard conditions
Question : Which of the following compounds gives a precipitate with FeCl3 due to phenolate formation?
Ethanol
Phenol
Diethyl ether
Acetic acid
Correct Answer : Phenol
Question : The percentage of nitrogen by mass in urea, CO(NH2)2, is approximately
23.3%
36.8%
46.7%
53.3%
Correct Answer : 46.7%
Question : Which of the following has the greatest number of possible stereoisomers?
2,3-dichlorobutane
2-chloropropane
1,2-dichloroethane
Propene
Correct Answer : 2,3-dichlorobutane
Question : The oxidation state of sulphur in H2SO5 is
+4
+5
+6
+7
Correct Answer : +6
Question : Which of the following is the correct order of acidic strength of hydrogen halides in aqueous solution?
HF < HCl < HBr < HI
HI < HBr < HCl < HF
HCl < HF < HBr < HI
HF < HI < HBr < HCl
Correct Answer : HF < HCl < HBr < HI
Question : A catalyst increases the rate of a reaction by
Increasing the equilibrium constant
Increasing the activation energy
Providing an alternative pathway with lower activation energy
Increasing the enthalpy change of reaction
Correct Answer : Providing an alternative pathway with lower activation energy
Question : Which of the following is the major product when 1-bromopropane reacts with alcoholic KOH?
Propane
Propene
Propan-1-ol
Propanal
Correct Answer : Propene
Question : The total number of atoms present in one molecule of H2SO4 is
5
6
7
8
Correct Answer : 7
Question : Which of the following complexes is expected to be diamagnetic?
[Fe(CN)6]4−
[FeF6]3−
[CoF6]3−
[NiCl4]2−
Correct Answer : [Fe(CN)6]4−
Question : Which of the following is the correct order of increasing bond angle?
H2O < NH3 < CH4
NH3 < H2O < CH4
CH4 < NH3 < H2O
H2O < CH4 < NH3
Correct Answer : H2O < NH3 < CH4
Question : The product formed when benzene diazonium chloride is warmed with water is
Aniline
Phenol
Chlorobenzene
Nitrobenzene
Correct Answer : Phenol
Question : Which of the following is not a colligative property?
Relative lowering of vapour pressure
Elevation of boiling point
Depression of freezing point
Viscosity
Correct Answer : Viscosity
Question : The coordination number of each sodium ion in crystalline NaCl is
4
6
8
12
Correct Answer : 6
Question : Which of the following is the most stable conformation of n-butane?
Eclipsed
Gauche
Anti
Fully eclipsed
Correct Answer : Anti
Question : When one mole of CaCO3 decomposes completely, the volume of CO2 produced at STP is approximately
11.2 L
22.4 L
44.8 L
5.6 L
Correct Answer : 22.4 L
Question : Which of the following is an example of a basic buffer?
CH3COOH + CH3COONa
NH4OH + NH4Cl
HCl + NaCl
HNO3 + KNO3
Correct Answer : NH4OH + NH4Cl
Question : The major product formed by dehydration of 2-methyl-2-butanol is
2-methyl-1-butene
2-methyl-2-butene
3-methyl-1-butene
But-2-ene
Correct Answer : 2-methyl-2-butene
Question : Which of the following statements regarding lanthanide contraction is correct?
Atomic size increases regularly from La to Lu
It is caused by poor shielding of 4f electrons
It is caused by complete shielding by 5d electrons
It occurs only in actinides
Correct Answer : It is caused by poor shielding of 4f electrons
Question : The pH of a 0.01 M NaOH solution at 25°C is
2
10
12
14
Correct Answer : 12
Question : Which of the following reactions converts an alkyl halide into an alcohol?
R–X + Mg → R–MgX
R–X + KOH(aq) → R–OH
R–X + KCN → R–CN
R–X + NaI → R–I
Correct Answer : R–X + KOH(aq) → R–OH
Question : The shape of NH3 molecule is
Linear
Trigonal planar
Trigonal pyramidal
Tetrahedral
Correct Answer : Trigonal pyramidal
Question : Which of the following compounds has the highest dipole moment?
BF3
CO2
NH3
CCl4
Correct Answer : NH3
Question : For a reaction, doubling the concentration of a reactant doubles the rate. The order with respect to that reactant is
Zero
First
Second
Third
Correct Answer : First
Question : Which of the following is an example of an addition polymer?
Nylon-6,6
Bakelite
Terylene
Polythene
Correct Answer : Polythene
Question : The reagent used in the Reimer-Tiemann reaction is
CHCl3 and NaOH
Zn-Hg and HCl
NaBH4
Br2 and FeBr3
Correct Answer : CHCl3 and NaOH
Question : Which of the following elements does not belong to the transition series?
Zn
Fe
Co
Cr
Correct Answer : Zn
Question : A compound has empirical formula CH2O and molar mass 180 g mol−1. Its molecular formula is
CH2O
C2H4O2
C6H12O6
C3H6O3
Correct Answer : C6H12O6
Question : Which of the following is the strongest nucleophile in a polar protic solvent?
F−
Cl−
Br−
I−
Correct Answer : I−
Question : The oxidation number of oxygen in H2O2 is
−2
−1
0
+1
Correct Answer : −1
Question : Which of the following statements about the d-block elements is correct?
All d-block elements are transition elements
Zn, Cd and Hg are typical transition elements
Transition elements generally form coloured ions
Transition elements never exhibit variable oxidation states
Correct Answer : Transition elements generally form coloured ions
Question : If the solubility product of AgCl is 1.0 × 10−10, its molar solubility in pure water is approximately
1.0 × 10−5 M
1.0 × 10−10 M
1.0 × 10−2 M
1.0 × 10−20 M
Correct Answer : 1.0 × 10−5 M
Question : Which of the following compounds undergoes polymerisation to form PVC?
CH2=CH2
CH2=CHCl
CF2=CF2
CH2=CH–CH3
Correct Answer : CH2=CHCl
Question : The major product of hydroboration-oxidation of propene is
Propan-1-ol
Propan-2-ol
Propanal
Propanone
Correct Answer : Propan-1-ol
Question : Which of the following ions is most stable in aqueous solution?
Li+
Na+
K+
Cs+
Correct Answer : Li+
Question : The van't Hoff factor for completely dissociated CaCl2 is
1
2
3
4
Correct Answer : 3
Question : Which of the following is a neutral oxide?
Na2O
CO2
CO
SO2
Correct Answer : CO
Question : In Friedel-Crafts acylation of benzene, the electrophile is
R+
RCO+
Cl+
NO2+
Correct Answer : RCO+
Question : Which of the following compounds can exhibit cis-trans isomerism?
CH2=CH2
CH3CH=CHCH3
CH3CH2CH3
CH3CH2Cl
Correct Answer : CH3CH=CHCH3
Question : The heat absorbed at constant pressure is equal to
ΔU
ΔH
ΔG
ΔS
Correct Answer : ΔH
Question : Which of the following is the correct electronic configuration of Fe3+?
[Ar] 3d3
[Ar] 3d4
[Ar] 3d5
[Ar] 3d6
Correct Answer : [Ar] 3d5
Question : Which of the following compounds is most reactive towards electrophilic aromatic substitution?
Benzene
Nitrobenzene
Aniline
Chlorobenzene
Correct Answer : Aniline
Question : The number of moles of electrons required to deposit one mole of Al from Al3+ is
1
2
3
4
Correct Answer : 3
Question : Which of the following statements is correct for an exothermic reaction?
ΔH is positive
Heat is absorbed from surroundings
ΔH is negative
Products always have higher enthalpy than reactants
Correct Answer : ΔH is negative
Question : Which of the following reagents converts an aldehyde into a primary alcohol?
KMnO4
LiAlH4
PCC
Conc. H2SO4
Correct Answer : LiAlH4
Question : The oxidation state of nitrogen in NH4NO3 for the nitrogen atoms is
Both +5
Both −3
−3 and +5
−2 and +4
Correct Answer : −3 and +5
Question : Which of the following has the maximum boiling point?
HF
HCl
HBr
HI
Correct Answer : HF
Question : The equilibrium constant of a reaction is 1.0 × 10^5. The reaction under standard conditions is
Strongly product-favoured
Strongly reactant-favoured
At equilibrium with equal concentrations
Impossible to predict
Correct Answer : Strongly product-favoured
Question : Which of the following is a secondary amine?
CH3NH2
(CH3)2NH
(CH3)3N
C6H5NH2
Correct Answer : (CH3)2NH
Question : The number of geometrical isomers possible for [Pt(NH3)2Cl2] is
1
2
3
4
Correct Answer : 2
Question : Which of the following is the most acidic hydrogen-containing compound?
CH4
NH3
H2O
HF
Correct Answer : HF
Question : In the contact process for manufacture of H2SO4, the catalyst used for oxidation of SO2 is
Fe2O3
V2O5
Ni
Pt only
Correct Answer : V2O5
Question : Which of the following is a primary standard substance commonly used in acid-base titration?
NaOH
HCl
Na2CO3
NH4OH
Correct Answer : Na2CO3
Question : The product of the reaction between ethanal and HCN is
Ethanol
2-hydroxypropanenitrile
Ethanoic acid
Acetamide
Correct Answer : 2-hydroxypropanenitrile
Question : Which of the following molecules has zero dipole moment?
NH3
H2O
BF3
SO2
Correct Answer : BF3
Question : The number of atoms in 4.4 g of CO2 is approximately
6.022 × 10^22
1.204 × 10^23
1.806 × 10^23
2.408 × 10^23
Correct Answer : 1.806 × 10^23
Question : Which of the following is an example of an interstitial compound?
Fe3C
NaCl
KBr
CaO
Correct Answer : Fe3C
Question : Which of the following is formed when aniline is treated with NaNO2 and HCl at 0–5°C?
Nitrobenzene
Benzenediazonium chloride
Phenylhydroxylamine
Chlorobenzene
Correct Answer : Benzenediazonium chloride
Question : The half-life of a zero-order reaction is proportional to
Initial concentration
Square of initial concentration
Inverse of initial concentration
Independent of initial concentration
Correct Answer : Initial concentration
Question : Which of the following is the correct order of reactivity of alkyl halides towards SN2 reaction?
CH3X > 1° > 2° > 3°
3° > 2° > 1° > CH3X
2° > 1° > CH3X > 3°
1° > 3° > 2° > CH3X
Correct Answer : CH3X > 1° > 2° > 3°
Question : Which of the following compounds is a zwitterion in the solid state?
Glucose
Glycine
Ethanol
Urea
Correct Answer : Glycine
Question : The shape of SF6 is
Tetrahedral
Octahedral
Square planar
Trigonal bipyramidal
Correct Answer : Octahedral
Question : If the concentration of a reactant is increased in an equilibrium reaction, the system generally shifts
To consume some of the added reactant
To produce more of the added reactant
Only towards products if ΔH is positive
Only towards reactants
Correct Answer : To consume some of the added reactant
Question : Which of the following is an example of a weak electrolyte?
HCl
NaOH
CH3COOH
NaCl
Correct Answer : CH3COOH
Question : The major product of reaction of 1-bromopropane with Mg in dry ether followed by CO2 and acidic hydrolysis is
Methane
Ethane
Propanoic acid
Butanoic acid
Correct Answer : Butanoic acid
Question : Which of the following metals is extracted by electrolytic reduction of its molten salt?
Na
Cu
Fe
Zn
Correct Answer : Na
Question : The bond angle in a linear molecule is
90°
109.5°
120°
180°
Correct Answer : 180°
Question : Which of the following is the strongest base in aqueous solution?
NH3
CH3NH2
(CH3)2NH
(CH3)3N
Correct Answer : (CH3)2NH
Question : The major product obtained by oxidation of ethylbenzene with hot alkaline KMnO4 followed by acidification is
Benzyl alcohol
Benzoic acid
Phenol
Styrene
Correct Answer : Benzoic acid
Question : Which of the following statements about adsorption is correct?
It is always a bulk phenomenon
It occurs only in gases
It is generally a surface phenomenon
It is independent of temperature
Correct Answer : It is generally a surface phenomenon
Question : The number of lone pairs on the central atom in XeF2 is
1
2
3
4
Correct Answer : 3
Question : Which of the following has the highest electron affinity in the periodic table?
F
Cl
O
N
Correct Answer : Cl
Question : The reaction CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O is an example of
Hydrolysis
Esterification
Amination
Halogenation
Correct Answer : Esterification
Question : The molarity of a solution containing 5.85 g of NaCl (molar mass = 58.5 g mol⁻¹) in 500 mL solution is:
0.1 M
0.2 M
0.5 M
1.0 M
Correct Answer : 0.2 M
Question : Which quantum number determines the shape of an orbital?
Principal quantum number
Azimuthal quantum number
Magnetic quantum number
Spin quantum number
Correct Answer : Azimuthal quantum number
Question : A gas occupies 2.0 L at 1 atm pressure. If its volume is reduced to 1.0 L at constant temperature, the final pressure will be:
0.5 atm
1 atm
2 atm
4 atm
Correct Answer : 2 atm
Question : Which of the following has the highest first ionisation enthalpy?
Na
Mg
Al
Si
Correct Answer : Si
Question : The oxidation state of chromium in K₂Cr₂O₇ is:
+3
+4
+6
+7
Correct Answer : +6
Question : Which of the following is the strongest acid?
CH₃COOH
ClCH₂COOH
Cl₂CHCOOH
CCl₃COOH
Correct Answer : CCl₃COOH
Question : The hybridisation of carbon atoms in benzene is:
sp
sp²
sp³
sp³d
Correct Answer : sp²
Question : Which reagent is commonly used to distinguish aldehydes from ketones?
Lucas reagent
Tollens' reagent
Conc. H₂SO₄
Baeyer's reagent
Correct Answer : Tollens' reagent
Question : The number of atoms present in 0.25 mol of helium is approximately:
1.505 × 10²³
3.011 × 10²³
6.022 × 10²³
1.204 × 10²⁴
Correct Answer : 1.505 × 10²³
Question : Which of the following elements belongs to the d-block?
K
Ca
Sc
Ga
Correct Answer : Sc
Question : For a first-order reaction, the half-life is:
Directly proportional to initial concentration
Inversely proportional to initial concentration
Independent of initial concentration
Proportional to the square of initial concentration
Correct Answer : Independent of initial concentration
Question : Which compound gives a positive iodoform test?
Methanol
Ethanol
Propanol
Methanoic acid
Correct Answer : Ethanol
Question : The coordination number of cobalt in [Co(NH₃)₆]Cl₃ is:
3
4
6
9
Correct Answer : 6
Question : Which of the following is paramagnetic?
N₂
O₂
CO
CN⁻
Correct Answer : O₂
Question : The pH of a 0.001 M HCl solution at 25°C is:
1
2
3
4
Correct Answer : 3
Question : Which of the following undergoes SN1 reaction most readily?
CH₃Cl
C₂H₅Cl
(CH₃)₂CHCl
(CH₃)₃CCl
Correct Answer : (CH₃)₃CCl
Question : The shape of XeF₄ molecule is:
Tetrahedral
Square planar
Trigonal bipyramidal
See-saw
Correct Answer : Square planar
Question : In an electrolytic cell, electrical energy is converted into:
Chemical energy
Mechanical energy
Nuclear energy
Thermal energy only
Correct Answer : Chemical energy
Question : Which of the following polymers is formed by condensation polymerisation?
Polythene
PVC
Teflon
Nylon-6,6
Correct Answer : Nylon-6,6
Question : The enthalpy change for a reaction is −100 kJ mol⁻¹. The reaction is:
Endothermic
Exothermic
Thermoneutral
Impossible
Correct Answer : Exothermic
Question : Which of the following has the greatest lattice enthalpy?
NaCl
KCl
MgO
CaO
Correct Answer : MgO
Question : The major product obtained when propene reacts with HBr in the presence of peroxide is:
1-bromopropane
2-bromopropane
1,2-dibromopropane
Propan-2-ol
Correct Answer : 1-bromopropane
Question : Which of the following is an example of a Lewis acid?
NH₃
H₂O
BF₃
OH⁻
Correct Answer : BF₃
Question : The number of sigma and pi bonds in ethyne (C₂H₂), respectively, is:
2 and 2
3 and 2
3 and 1
4 and 2
Correct Answer : 3 and 2
Question : If the equilibrium constant Kc for a reaction is very large, the equilibrium mixture contains predominantly:
Reactants
Products
Equal amounts of reactants and products
Only catalysts
Correct Answer : Products
Question : Which of the following is the correct order of acidic strength?
CH₄ < NH₃ < H₂O < HF
HF < H₂O < NH₃ < CH₄
NH₃ < CH₄ < H₂O < HF
CH₄ < H₂O < NH₃ < HF
Correct Answer : CH₄ < NH₃ < H₂O < HF
Question : A solution contains 0.1 mol glucose dissolved in 900 g water. The mole fraction of glucose is approximately:
0.001
0.002
0.01
0.1
Correct Answer : 0.002
Question : Which of the following compounds exhibits geometrical isomerism?
CH₂=CH₂
CH₃CH=CH₂
CH₃CH=CHCH₃
(CH₃)₂C=CH₂
Correct Answer : CH₃CH=CHCH₃
Question : The catalyst used in the Haber process is:
Fe
V₂O₅
Ni
Pt
Correct Answer : Fe
Question : Which of the following is the most stable carbocation?
CH₃⁺
CH₃CH₂⁺
(CH₃)₂CH⁺
(CH₃)₃C⁺
Correct Answer : (CH₃)₃C⁺
Question : The standard electrode potential of a galvanic cell is positive when:
The cell reaction is non-spontaneous
The cell reaction is spontaneous
ΔG° is positive
K is less than 1
Correct Answer : The cell reaction is spontaneous
Question : Which of the following oxides is amphoteric?
Na₂O
MgO
Al₂O₃
SO₃
Correct Answer : Al₂O₃
Question : The major product of dehydration of 2-butanol with concentrated H₂SO₄ is:
But-1-ene
But-2-ene
Butane
Butanal
Correct Answer : But-2-ene
Question : For a reaction A → products, doubling the concentration of A doubles the reaction rate. The order of the reaction with respect to A is:
Zero
First
Second
Third
Correct Answer : First
Question : Which of the following species has the largest bond angle?
NH₃
H₂O
CH₄
BF₃
Correct Answer : BF₃
Question : The oxidation number of sulfur in H₂SO₄ is:
+2
+4
+6
−2
Correct Answer : +6
Question : Which vitamin is also known as ascorbic acid?
Vitamin A
Vitamin B₁
Vitamin C
Vitamin D
Correct Answer : Vitamin C
Question : A buffer solution can be prepared by mixing:
HCl and NaCl
NaOH and KCl
CH₃COOH and CH₃COONa
H₂SO₄ and Na₂SO₄
Correct Answer : CH₃COOH and CH₃COONa
Question : Which of the following statements about transition elements is correct?
They generally have completely filled d-orbitals in their atoms
They commonly show variable oxidation states
They never form coloured ions
They are all diamagnetic
Correct Answer : They commonly show variable oxidation states
Question : When aniline is treated with NaNO₂ and HCl at 0–5°C, the product formed is:
Nitrobenzene
Phenol
Benzenediazonium chloride
Chlorobenzene
Correct Answer : Benzenediazonium chloride