SRMJEEE Chemistry PYQs from 2015–2025 with Detailed Solutions
1. The IUPAC name of \( \ce{CH3-CH(OH)-CH2-CHO} \) is:
a) 3-Hydroxybutanal
b) 2-Hydroxybutanal
c) 1-Hydroxybutanal
d) 4-Hydroxybutanal
View Answer
a) 3-Hydroxybutanal
Explanation: Longest chain = 4C, \( \ce{-CHO} \) at C1, \( \ce{-OH} \) at C3 → 3-hydroxybutanal.
SRMJEEE 20232. The oxidation state of sulfur in \( \ce{SO4^{2-}} \) is:
a) +4
b) +6
c) +2
d) -2
View Answer
b) +6
Explanation: \( x + 4(-2) = -2 \Rightarrow x = +6 \).
SRMJEEE 20193. The hybridization of carbon in \( \ce{CO2} \) is:
a) sp
b) sp²
c) sp³
d) dsp²
View Answer
a) sp
Explanation: Linear geometry → sp hybridization.
SRMJEEE 20214. The monomer of PVC is:
a) Ethylene
b) Vinyl chloride
c) Styrene
d) Tetrafluoroethylene
View Answer
b) Vinyl chloride
Explanation: \( \ce{CH2=CHCl} \).
SRMJEEE 20205. The rate of a zero-order reaction has units:
a) s⁻¹
b) mol L⁻¹ s⁻¹
c) L mol⁻¹ s⁻¹
d) mol² L⁻² s⁻¹
View Answer
b) mol L⁻¹ s⁻¹
Explanation: Rate = k → [concentration][time]⁻¹.
SRMJEEE 20246. The shape of \( \ce{XeF4} \) is:
a) Tetrahedral
b) Square planar
c) Trigonal bipyramidal
d) Octahedral
View Answer
b) Square planar
Explanation: 6 electron pairs, 2 lone pairs → square planar.
SRMJEEE 20227. The pH of 0.01 M \( \ce{HCl} \) is:
a) 1
b) 2
c) 12
d) 13
View Answer
b) 2
Explanation: \( [\ce{H+}] = 0.01 = 10^{-2} \Rightarrow \text{pH} = 2 \).
SRMJEEE 20188. The catalyst used in Contact process is:
a) Fe
b) \( \ce{V2O5} \)
c) Pt
d) Ni
View Answer
b) \( \ce{V2O5} \)
Explanation: \( 2\ce{SO2 + O2 -> 2SO3} \).
SRMJEEE 20239. The number of moles in 44 g \( \ce{CO2} \) is:
a) 1
b) 2
c) 0.5
d) 4
View Answer
a) 1
Explanation: Molar mass = 44 g/mol → 44/44 = 1 mol.
SRMJEEE 201710. The bond order of \( \ce{O2} \) is:
a) 1
b) 1.5
c) 2
d) 2.5
View Answer
c) 2
Explanation: (10 – 6)/2 = 2.
SRMJEEE 202511. The number of unpaired electrons in \( \ce{Ni^{2+}} \) (atomic number 28) is:
a) 0
b) 1
c) 2
d) 3
View Answer
c) 2
Explanation: \( \ce{Ni}: [Ar] 4s^2 3d^8 \to \ce{Ni^{2+}}: [Ar] 3d^8 \) → 2 unpaired electrons in \( t_{2g} \).
SRMJEEE 202312. The IUPAC name of \( \ce{(CH3)2CHCH2CHO} \) is:
a) 3-Methylbutanal
b) 2-Methylbutanal
c) 2,2-Dimethylpropanal
d) Pentanal
View Answer
a) 3-Methylbutanal
Explanation: Chain: 4C, \( \ce{-CHO} \) at C1, methyl at C3 → 3-methylbutanal.
SRMJEEE 202113. The molarity of 98% \( \ce{H2SO4} \) (d = 1.8 g/mL) is:
a) 10 M
b) 18 M
c) 9 M
d) 15 M
View Answer
b) 18 M
Explanation: Mass of \( \ce{H2SO4} \) in 1L = 0.98 × 1800 = 1764 g → M = 1764 / 98 ≈ 18 M.
SRMJEEE 202414. The geometry of \( \ce{PCl5} \) is:
a) Trigonal bipyramidal
b) Tetrahedral
c) Square pyramidal
d) Octahedral
View Answer
a) Trigonal bipyramidal
Explanation: 5 bond pairs → sp³d → trigonal bipyramidal.
SRMJEEE 202015. The buffer solution is:
a) \( \ce{HCl + NaCl} \)
b) \( \ce{CH3COOH + CH3COONa} \)
c) \( \ce{NaOH + NaCl} \)
d) \( \ce{H2SO4 + Na2SO4} \)
View Answer
b) \( \ce{CH3COOH + CH3COONa} \)
Explanation: Weak acid + its salt with strong base.
SRMJEEE 201916. The oxidation state of Cr in \( \ce{K2Cr2O7} \) is:
a) +3
b) +6
c) +7
d) +12
View Answer
b) +6
Explanation: 2(+1) + 2x + 7(-2) = 0 → 2x = 12 → x = +6.
SRMJEEE 202217. The monomer of natural rubber is:
a) Chloroprene
b) Neoprene
c) Isoprene
d) Styrene
View Answer
c) Isoprene
Explanation: \( \ce{CH2=C(CH3)-CH=CH2} \).
SRMJEEE 201818. The solubility of \( \ce{AgCl} \) if \( K_{sp} = 1.8 \times 10^{-10} \) is:
a) \( 1.8 \times 10^{-10} \) M
b) \( 1.34 \times 10^{-5} \) M
c) \( 1.8 \times 10^{-5} \) M
d) \( 3.6 \times 10^{-10} \) M
View Answer
b) \( 1.34 \times 10^{-5} \) M
Explanation: \( s^2 = 1.8 \times 10^{-10} \Rightarrow s = \sqrt{1.8 \times 10^{-10}} \approx 1.34 \times 10^{-5} \).
SRMJEEE 202319. The unit of rate constant for a first-order reaction is:
a) s⁻¹
b) mol L⁻¹ s⁻¹
c) L mol⁻¹ s⁻¹
d) L² mol⁻² s⁻¹
View Answer
a) s⁻¹
Explanation: Rate = k[A] → k = s⁻¹.
SRMJEEE 202120. The magnetic moment of \( \ce{[Fe(H2O)6]^{2+}} \) is:
a) 0 BM
b) 1.73 BM
c) 4.9 BM
d) 5.92 BM
View Answer
c) 4.9 BM
Explanation: \( \ce{Fe^{2+}} \) (d⁶), high spin → 4 unpaired → \( \sqrt{24} \approx 4.9 \) BM.
SRMJEEE 202521. The functional group in acetone is:
a) Aldehyde
b) Ketone
c) Alcohol
d) Carboxylic acid
View Answer
b) Ketone
Explanation: \( \ce{(CH3)2C=O} \).
SRMJEEE 201722. The pH of 0.1 M \( \ce{CH3COOH} \) (\( K_a = 1.8 \times 10^{-5} \)) is:
a) 2.37
b) 2.87
c) 4.74
d) 5.74
View Answer
b) 2.87
Explanation: \( \text{pH} = \frac{1}{2} [\text{p}K_a - \log C] = \frac{1}{2} [4.74 - (-1)] = 2.87 \).
SRMJEEE 202223. The shape of \( \ce{SF4} \) is:
a) Tetrahedral
b) Trigonal bipyramidal
c) See-saw
d) Square planar
View Answer
c) See-saw
Explanation: 5 electron pairs, 1 lone pair → see-saw.
SRMJEEE 202024. The catalyst in Haber process is:
a) \( \ce{V2O5} \)
b) Pt
c) Fe
d) Ni
View Answer
c) Fe
Explanation: Finely divided iron with promoters.
SRMJEEE 201925. The number of moles in 36 g of water is:
a) 1
b) 2
c) 3
d) 4
View Answer
b) 2
Explanation: 36 / 18 = 2 mol.
SRMJEEE 201626. The product of Cannizzaro reaction of formaldehyde is:
a) Formic acid + Methanol
b) Formic acid only
c) Methanol only
d) CO₂ + H₂
View Answer
a) Formic acid + Methanol
Explanation: Disproportionation: \( 2\ce{HCHO} \to \ce{HCOOH} + \ce{CH3OH} \).
SRMJEEE 202327. The hybridization in \( \ce{C2H4} \) is:
a) sp
b) sp²
c) sp³
d) sp³d
View Answer
b) sp²
Explanation: Trigonal planar carbon → sp².
SRMJEEE 202128. The conductivity of strong electrolyte:
a) Increases on dilution
b) Decreases on dilution
c) Remains same
d) Becomes zero
View Answer
b) Decreases on dilution
Explanation: Number of ions per unit volume decreases.
SRMJEEE 202429. The bond order of \( \ce{N2} \) is:
a) 1
b) 2
c) 3
d) 2.5
View Answer
c) 3
Explanation: (10 – 4)/2 = 3.
SRMJEEE 202030. The reagent used in HVZ reaction is:
a) \( \ce{Br2/Fe} \)
b) \( \ce{Br2/P} \)
c) \( \ce{Cl2/hv} \)
d) \( \ce{I2/NaOH} \)
View Answer
b) \( \ce{Br2/P} \)
Explanation: Hell-Volhard-Zelinsky: \( \ce{RCH2COOH -> RCHBrCOOH} \).
SRMJEEE 201831. The lattice energy is highest for:
a) \( \ce{NaCl} \)
b) \( \ce{MgO} \)
c) \( \ce{CaF2} \)
d) \( \ce{KCl} \)
View Answer
b) \( \ce{MgO} \)
Explanation: Higher charge (+2, –2) and smaller ions.
SRMJEEE 202232. The IUPAC name of \( \ce{CH3COCH2COCH3} \) is:
a) Pentane-2,4-dione
b) Hexane-2,5-dione
c) Butane-2,3-dione
d) Pentane-1,3-dione
View Answer
a) Pentane-2,4-dione
Explanation: 5C chain, carbonyls at 2 and 4.
SRMJEEE 201933. The half-life of a reaction is halved when concentration is doubled. The order is:
a) 0
b) 1
c) 2
d) 3
View Answer
c) 2
Explanation: \( t_{1/2} \propto 1/[A]_0 \) → second order.
SRMJEEE 202334. The coordination number in \( \ce{CsCl} \) is:
a) 4
b) 6
c) 8
d) 12
View Answer
c) 8
Explanation: Body-centered cubic → 8:8 coordination.
SRMJEEE 202135. The gas evolved when \( \ce{Zn} \) reacts with dil. \( \ce{H2SO4} \) is:
a) \( \ce{O2} \)
b) \( \ce{H2} \)
c) \( \ce{SO2} \)
d) \( \ce{H2S} \)
View Answer
b) \( \ce{H2} \)
Explanation: \( \ce{Zn + H2SO4 -> ZnSO4 + H2} \).
SRMJEEE 201736. The reagent to convert \( \ce{RCH2OH \to RCHO} \) is:
a) \( \ce{K2Cr2O7/H+} \)
b) PCC
c) \( \ce{LiAlH4} \)
d) \( \ce{NaBH4} \)
View Answer
b) PCC
Explanation: Pyridinium chlorochromate stops at aldehyde.
SRMJEEE 202437. The number of π bonds in \( \ce{C6H6} \) is:
a) 3
b) 6
c) 9
d) 12
View Answer
b) 6
Explanation: 3 double bonds → 6 π electrons (delocalized).
SRMJEEE 202038. The molar conductivity of \( \ce{CH3COOH} \) at infinite dilution is:
a) Higher than \( \ce{HCl} \)
b) Lower than \( \ce{NaCl} \)
c) Equal to \( \ce{KOH} \)
d) Cannot be predicted
View Answer
b) Lower than \( \ce{NaCl} \)
Explanation: Weak electrolyte → lower \( \Lambda_m^0 \).
SRMJEEE 201939. The product of \( \ce{RMgX + CO2} \) followed by \( \ce{H3O+} \) is:
a) ROH
b) RCHO
c) RCOOH
d) RCOR
View Answer
c) RCOOH
Explanation: Carboxylic acid with one extra carbon.
SRMJEEE 202240. The strongest nucleophile is:
a) \( \ce{Cl^-} \)
b) \( \ce{Br^-} \)
c) \( \ce{I^-} \)
d) \( \ce{F^-} \)
View Answer
c) \( \ce{I^-} \)
Explanation: In protic solvent, larger size → better nucleophile.
SRMJEEE 202141. The oxidation state of S in \( \ce{H2S2O8} \) is:
a) +6
b) +7
c) +5
d) +8
View Answer
b) +7
Explanation: 2(+1) + 2x + 8(-2) = 0 → 2x = 14 → x = +7.
SRMJEEE 202342. The geometry of \( \ce{NH4^+} \) is:
a) Trigonal planar
b) Tetrahedral
c) Pyramidal
d) Linear
View Answer
b) Tetrahedral
Explanation: sp³, 4 bond pairs.
SRMJEEE 201843. The emf of the cell \( \ce{Zn | Zn^{2+} (1M) || Cu^{2+} (1M) | Cu} \) is 1.1 V. \( E^\circ_{\ce{Cu^{2+}/Cu}} = 0.34 \) V. Then \( E^\circ_{\ce{Zn^{2+}/Zn}} \) is:
a) -0.76 V
b) +0.76 V
c) -1.1 V
d) +1.1 V
View Answer
a) -0.76 V
Explanation: \( E^\circ = E^\circ_{\ce{cathode}} - E^\circ_{\ce{anode}} \Rightarrow 1.1 = 0.34 - E^\circ_{\ce{Zn}} \Rightarrow E^\circ_{\ce{Zn}} = -0.76 \) V.
SRMJEEE 202444. The monomer of Teflon is:
a) Vinyl chloride
b) Tetrafluoroethylene
c) Styrene
d) Acrylonitrile
View Answer
b) Tetrafluoroethylene
Explanation: \( \ce{CF2=CF2} \).
SRMJEEE 202045. The order of reactivity of alcohols with \( \ce{HCl} \) is:
a) 1° > 2° > 3°
b) 3° > 2° > 1°
c) 2° > 1° > 3°
d) 1° > 3° > 2°
View Answer
b) 3° > 2° > 1°
Explanation: Stability of carbocation.
SRMJEEE 201946. The number of atoms in 4.4 g \( \ce{CO2} \) is:
a) \( 6.022 \times 10^{22} \)
b) \( 1.806 \times 10^{23} \)
c) \( 3 \times 6.022 \times 10^{23} \)
d) \( 1.806 \times 10^{24} \)
View Answer
c) \( 3 \times 6.022 \times 10^{23} \)
Explanation: 4.4 g = 0.1 mol → 0.1 × 3 × \( N_A \) = \( 3 \times 6.022 \times 10^{23} \).
SRMJEEE 202247. The compound with zero dipole moment is:
a) \( \ce{CH3Cl} \)
b) \( \ce{CH2Cl2} \)
c) \( \ce{CHCl3} \)
d) \( \ce{CCl4} \)
View Answer
d) \( \ce{CCl4} \)
Explanation: Symmetrical tetrahedral.
SRMJEEE 202148. The activation energy is lowest for:
a) Exothermic reaction
b) Endothermic reaction
c) Catalyzed reaction
d) Uncatalyzed reaction
View Answer
c) Catalyzed reaction
Explanation: Catalyst lowers \( E_a \).
SRMJEEE 202349. The product of \( \ce{CH3CHO + HCN} \) is:
a) \( \ce{CH3CH2CN} \)
b) \( \ce{CH3CH(OH)CN} \)
c) \( \ce{CH3COOH} \)
d) \( \ce{CH3CH2OH} \)
View Answer
b) \( \ce{CH3CH(OH)CN} \)
Explanation: Cyanohydrin formation.
SRMJEEE 201850. The electronic configuration of \( \ce{Cr} \) (Z=24) is:
a) [Ar] 4s² 3d⁴
b) [Ar] 4s¹ 3d⁵
c) [Ar] 4s² 3d⁵
d) [Ar] 4s¹ 3d⁴
View Answer
b) [Ar] 4s¹ 3d⁵
Explanation: Half-filled d-subshell stability.
SRMJEEE 202051. The reaction \( \ce{CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O} \) is catalyzed by:
a) \( \ce{NaOH} \)
b) \( \ce{HCl} \)
c) \( \ce{H2SO4} \)
d) \( \ce{KMnO4} \)
View Answer
c) \( \ce{H2SO4} \)
Explanation: Conc. \( \ce{H2SO4} \) acts as a dehydrating agent and catalyst in esterification.
SRMJEEE 202352. The shape of \( \ce{BrF5} \) is:
a) Square pyramidal
b) Octahedral
c) Square planar
d) Trigonal bipyramidal
View Answer
a) Square pyramidal
Explanation: 6 electron pairs (5 bonding + 1 lone pair) → square pyramidal.
SRMJEEE 202153. The molarity of 49% \( \ce{H2SO4} \) (density = 1.4 g/mL) is:
a) 5 M
b) 7 M
c) 10 M
d) 14 M
View Answer
b) 7 M
Explanation: Mass in 1L = 0.49 × 1400 = 686 g → M = 686 / 98 ≈ 7 M.
SRMJEEE 202454. The reagent used to convert alkene to alcohol is:
a) \( \ce{OsO4} \)
b) Cold alkaline \( \ce{KMnO4} \)
c) \( \ce{O3/Zn} \)
d) \( \ce{B2H6} \)
View Answer
b) Cold alkaline \( \ce{KMnO4} \)
Explanation: Syn dihydroxylation → vicinal diol.
SRMJEEE 202055. The pH of a solution containing 0.1 M \( \ce{NH3} \) (\( K_b = 1.8 \times 10^{-5} \)) is:
a) 2.74
b) 5.74
c) 11.13
d) 9.25
View Answer
c) 11.13
Explanation: \( \text{pOH} = \frac{1}{2} [\text{p}K_b - \log C] = 2.87 \Rightarrow \text{pH} = 14 - 2.87 = 11.13 \).
SRMJEEE 202256. The oxidation state of nitrogen in \( \ce{N2O} \) is:
a) +1
b) +2
c) +3
d) +4
View Answer
a) +1
Explanation: \( 2x + (-2) = 0 \Rightarrow x = +1 \).
SRMJEEE 201957. The monomer of Bakelite is:
a) Phenol + Formaldehyde
b) Urea + Formaldehyde
c) Melamine + Formaldehyde
d) Ethylene glycol + Terephthalic acid
View Answer
a) Phenol + Formaldehyde
Explanation: Cross-linked phenol-formaldehyde resin.
SRMJEEE 202358. The unit of equilibrium constant for \( \ce{N2 + 3H2 ⇌ 2NH3} \) is:
a) \( \text{mol L}^{-1} \)
b) \( \text{L}^2 \text{mol}^{-2} \)
c) \( \text{mol}^2 \text{L}^{-2} \)
d) Dimensionless
View Answer
c) \( \text{mol}^2 \text{L}^{-2} \)
Explanation: \( K_c = \frac{[\ce{NH3}]^2}{[\ce{N2}][\ce{H2}]^3} \Rightarrow \text{mol}^2 \text{L}^{-2} \).
SRMJEEE 202159. The rate constant of a reaction doubles when temperature increases from 300 K to 310 K. Activation energy is:
a) 52.9 kJ/mol
b) 62.9 kJ/mol
c) 72.9 kJ/mol
d) 82.9 kJ/mol
View Answer
a) 52.9 kJ/mol
Explanation: \( \ln 2 = \frac{E_a}{R} \left( \frac{10}{300 \times 310} \right) \Rightarrow E_a \approx 52.9 \) kJ/mol.
SRMJEEE 202460. The complex \( [\ce{Ni(CN)4}]^{2-} \) is:
a) Square planar, diamagnetic
b) Tetrahedral, paramagnetic
c) Square planar, paramagnetic
d) Octahedral, diamagnetic
View Answer
a) Square planar, diamagnetic
Explanation: \( \ce{Ni^{2+}} \) (d⁸), strong field \( \ce{CN^-} \) → dsp² → no unpaired electrons.
SRMJEEE 202061. The van’t Hoff factor for \( \ce{CaCl2} \) is:
a) 1
b) 2
c) 3
d) 4
View Answer
c) 3
Explanation: \( \ce{CaCl2 -> Ca^{2+} + 2Cl^-} \) → 3 ions.
SRMJEEE 201962. The compound that does not show iodoform test is:
a) Acetophenone
b) Acetaldehyde
c) Benzaldehyde
d) Ethanol
View Answer
c) Benzaldehyde
Explanation: Requires \( \ce{CH3CO-} \) or \( \ce{CH3CH(OH)-} \).
SRMJEEE 202263. The spin-only magnetic moment of \( \ce{Fe^{3+}} \) is:
a) 1.73 BM
b) 3.87 BM
c) 4.90 BM
d) 5.92 BM
View Answer
d) 5.92 BM
Explanation: d⁵ high spin → 5 unpaired → \( \sqrt{35} \approx 5.92 \) BM.
SRMJEEE 202364. The geometry of \( \ce{XeF6} \) is:
a) Distorted octahedral
b) Pentagonal bipyramidal
c) Square pyramidal
d) Trigonal bipyramidal
View Answer
a) Distorted octahedral
Explanation: 7 electron pairs → distorted due to lone pair.
SRMJEEE 202165. The reagent to distinguish 1° and 2° amine is:
a) \( \ce{HNO2} \)
b) \( \ce{CHCl3/KOH} \)
c) \( \ce{NaOH} \)
d) \( \ce{HCl} \)
View Answer
a) \( \ce{HNO2} \)
Explanation: 1° → N₂ gas, 2° → oily layer.
SRMJEEE 202066. The number of moles in 64 g of \( \ce{O2} \) is:
a) 1
b) 2
c) 3
d) 4
View Answer
b) 2
Explanation: 64 / 32 = 2 mol.
SRMJEEE 201867. The product of \( \ce{C6H5CHO + CH3MgBr} \) followed by hydrolysis is:
a) \( \ce{C6H5CH2OH} \)
b) \( \ce{C6H5CH(OH)CH3} \)
c) \( \ce{C6H5COCH3} \)
d) \( \ce{C6H5CH3} \)
View Answer
b) \( \ce{C6H5CH(OH)CH3} \)
Explanation: Grignard + aldehyde → secondary alcohol.
SRMJEEE 202468. The cell constant is given by:
a) \( \kappa \times R \)
b) \( l/A \)
c) \( \kappa / R \)
d) \( A/l \)
View Answer
b) \( l/A \)
Explanation: Distance between electrodes / area.
SRMJEEE 202269. The order of reaction if rate = \( k[A]^2[B] \) is:
a) 1
b) 2
c) 3
d) 0
View Answer
c) 3
Explanation: 2 + 1 = 3.
SRMJEEE 202170. The hybridization of carbon in graphite is:
a) sp
b) sp²
c) sp³
d) dsp²
View Answer
b) sp²
Explanation: Planar hexagonal layers.
SRMJEEE 201971. The antiseptic used in hospitals is:
a) Iodine
b) Phenol
c) Ethanol
d) Chlorine
View Answer
b) Phenol
Explanation: Carbolic acid (0.2% solution).
SRMJEEE 202372. The oxidation state of Cl in \( \ce{HClO4} \) is:
a) +5
b) +6
c) +7
d) +8
View Answer
c) +7
Explanation: \( +1 + x + 4(-2) = 0 \Rightarrow x = +7 \).
SRMJEEE 202073. The number of σ bonds in \( \ce{C6H6} \) is:
a) 6
b) 9
c) 12
d) 15
View Answer
c) 12
Explanation: 6 C–C + 6 C–H = 12 σ bonds.
SRMJEEE 202274. The standard reduction potential of \( \ce{Li^+/Li} \) is:
a) -3.04 V
b) -0.76 V
c) +0.34 V
d) 0 V
View Answer
a) -3.04 V
Explanation: Most negative → strongest reducing agent.
SRMJEEE 202175. The monomer of nylon-6 is:
a) Adipic acid + Hexamethylenediamine
b) Caprolactam
c) Terephthalic acid + Ethylene glycol
d) Phenol + Formaldehyde
View Answer
b) Caprolactam
Explanation: Ring-opening polymerization.
SRMJEEE 201976. The reaction \( \ce{RCOOH + PCl5 -> RCOCl + POCl3 + HCl} \) is used to prepare:
a) Ester
b) Acid chloride
c) Amide
d) Anhydride
View Answer
b) Acid chloride
Explanation: Conversion of –COOH to –COCl.
SRMJEEE 202477. The unit cell of diamond is:
a) FCC with 8 atoms
b) BCC with 4 atoms
c) FCC with 4 atoms
d) Simple cubic
View Answer
a) FCC with 8 atoms
Explanation: 4 atoms in FCC + 4 inside tetrahedral voids = 8.
SRMJEEE 202078. The molecule with highest bond energy is:
a) \( \ce{H2} \)
b) \( \ce{N2} \)
c) \( \ce{O2} \)
d) \( \ce{F2} \)
View Answer
b) \( \ce{N2} \)
Explanation: Triple bond → highest bond energy (946 kJ/mol).
SRMJEEE 202379. The radioactive isotope used in PET scan is:
a) C-14
b) I-131
c) F-18
d) P-32
View Answer
c) F-18
Explanation: Fluorodeoxyglucose (FDG) contains \( \ce{^{18}F} \).
SRMJEEE 202280. The product of \( \ce{RMgX + HCHO} \) followed by hydrolysis is:
a) RCHO
b) RCH₂OH
c) RCOOH
d) RCOR
View Answer
b) RCH₂OH
Explanation: Primary alcohol.
SRMJEEE 202181. The molar conductivity at infinite dilution is highest for:
a) \( \ce{CH3COOH} \)
b) \( \ce{HCl} \)
c) \( \ce{NaCl} \)
d) \( \ce{NH4OH} \)
View Answer
b) \( \ce{HCl} \)
Explanation: Strong acid → highest ion mobility.
SRMJEEE 202082. The most reactive towards SN1 is:
a) \( \ce{CH3Br} \)
b) \( \ce{(CH3)3CBr} \)
c) \( \ce{CH3CH2Br} \)
d) \( \ce{C6H5Br} \)
View Answer
b) \( \ce{(CH3)3CBr} \)
Explanation: 3° carbocation most stable.
SRMJEEE 202483. The ligand in \( [\ce{Co(NH3)6}]^{3+} \) is:
a) Neutral
b) Anionic
c) Cationic
d) Zwitterionic
View Answer
a) Neutral
Explanation: \( \ce{NH3} \) is neutral ligand.
SRMJEEE 201984. The geometry of \( \ce{ClF3} \) is:
a) T-shaped
b) Trigonal planar
c) Tetrahedral
d) Linear
View Answer
a) T-shaped
Explanation: 5 electron pairs, 2 lone pairs → T-shaped.
SRMJEEE 202385. The reagent used in Swarts reaction is:
a) \( \ce{AgF} \)
b) \( \ce{HF} \)
c) \( \ce{SbF3} \)
d) \( \ce{NaF} \)
View Answer
c) \( \ce{SbF3} \)
Explanation: \( \ce{RCl + SbF3 -> RF} \).
SRMJEEE 202186. The number of molecules in 18 g of \( \ce{H2O} \) is:
a) \( 6.022 \times 10^{23} \)
b) \( 6.022 \times 10^{22} \)
c) \( 3.011 \times 10^{23} \)
d) \( 1.204 \times 10^{24} \)
View Answer
a) \( 6.022 \times 10^{23} \)
Explanation: 18 g = 1 mol → \( N_A \) molecules.
SRMJEEE 201887. The product of \( \ce{C6H5NH2 + (CH3CO)2O} \) is:
a) Aniline
b) Acetanilide
c) Benzamide
d) Nitrobenzene
View Answer
b) Acetanilide
Explanation: Acetylation of amine.
SRMJEEE 202288. Osmotic pressure is a:
a) Colligative property
b) Intensive property
c) Extensive property
d) Chemical property
View Answer
a) Colligative property
Explanation: Depends on number of particles.
SRMJEEE 202089. The bond order in \( \ce{NO} \) is:
a) 1.5
b) 2
c) 2.5
d) 3
View Answer
c) 2.5
Explanation: (10 – 5)/2 = 2.5.
SRMJEEE 202490. The refrigerant used in modern ACs is:
a) \( \ce{CCl4} \)
b) \( \ce{CF2Cl2} \)
c) \( \ce{R-134a} \)
d) \( \ce{NH3} \)
View Answer
c) \( \ce{R-134a} \)
Explanation: 1,1,1,2-Tetrafluoroethane (HFC).
SRMJEEE 202391. The reagent used to distinguish aldehyde and ketone is:
a) Fehling’s solution
b) 2,4-DNP
c) NaOH
d) \( \ce{I2/NaOH} \)
View Answer
a) Fehling’s solution
Explanation: Aldehydes give red ppt; ketones do not.
SRMJEEE 201992. The geometry of \( \ce{BF3} \) is:
a) Trigonal planar
b) Tetrahedral
c) Pyramidal
d) Linear
View Answer
a) Trigonal planar
Explanation: sp², 120° bond angle.
SRMJEEE 202193. The half-life of a first-order reaction is 20 min. Time for 75% completion is:
a) 20 min
b) 40 min
c) 60 min
d) 80 min
View Answer
b) 40 min
Explanation: 75% → 2 half-lives → 2 × 20 = 40 min.
SRMJEEE 202494. The unit of cell constant is:
a) cm⁻¹
b) S cm⁻¹
c) ohm
d) mho
View Answer
a) cm⁻¹
Explanation: \( l/A \) → cm⁻¹.
SRMJEEE 202295. The strongest acid is:
a) \( \ce{HClO} \)
b) \( \ce{HClO2} \)
c) \( \ce{HClO3} \)
d) \( \ce{HClO4} \)
View Answer
d) \( \ce{HClO4} \)
Explanation: Acid strength increases with oxygen atoms.
SRMJEEE 202096. The number of σ and π bonds in \( \ce{C2H2} \) is:
a) 3σ, 2π
b) 5σ, 1π
c) 3σ, 1π
d) 4σ, 2π
View Answer
a) 3σ, 2π
Explanation: \( \ce{H-C#C-H} \) → 2 C–H σ, 1 C–C σ, 2 C–C π.
SRMJEEE 201897. The van’t Hoff factor for \( \ce{K2SO4} \) is:
a) 1
b) 2
c) 3
d) 4
View Answer
c) 3
Explanation: \( \ce{K2SO4 -> 2K+ + SO4^{2-}} \) → 3 ions.
SRMJEEE 202398. The coordination number of \( \ce{Na+} \) in \( \ce{NaCl} \) is:
a) 4
b) 6
c) 8
d) 12
View Answer
b) 6
Explanation: Rock salt structure → 6:6 coordination.
SRMJEEE 201999. The paramagnetic species among the following is:
a) \( \ce{CN^-} \)
b) \( \ce{NO^+} \)
c) \( \ce{O2^-} \)
d) \( \ce{CO} \)
View Answer
c) \( \ce{O2^-} \)
Explanation: 17 electrons → 1 unpaired.
SRMJEEE 2025100. The reaction \( \ce{2N2O5 -> 4NO2 + O2} \) is:
a) Zero order
b) First order
c) Second order
d) Third order
View Answer
b) First order
Explanation: Rate = \( k[\ce{N2O5}] \).
SRMJEEE 2021