PRACTICE QUESTION PAPER

SECTION A

Q1. What would be the major product formed when (CH₃)₃C–OH is heated at 358 K in the presence of H₃PO₄:
(a) (CH₃)₃COOH
(b) (CH₃)₃CHO
(c) (CH₃)₂CH=CH₂
(d) (CH₃)₃C–O–C–(CH₃)₃

Q2. The complex [Co(NH₃)₅(NO₂)]Cl₂ is obtained in yellow and red coloured forms. The difference in colour is attributed to:
(a) Coordination isomerism
(b) Facial isomerism
(c) Linkage isomerism
(d) Solvate isomerism

Q3. Which of the following purines (nitrogenous bases with two-ring structure) are common to RNA and DNA?
(a) Adenine, Thymine
(b) Guanine, Thymine
(c) Thymine, Cytosine
(d) Adenine, Guanine

Q4. India’s first pipeline was laid to transport crude oil in Digboi, Assam. Which method would be used to prevent corrosion of these pipelines?
(a) Barrier protection
(b) Alloying
(c) Cathodic protection
(d) Anodising

Q5. Which of the following alkyl iodide cannot be produced by the reaction of HI with an appropriate ether?
(a) (CH₃)₃C–CH₂–I
(b) (CH₃)₂CH–I
(c) C₆H₅CH₂–I
(d) C₆H₅–I

Q6. What is the order and molecularity of hydrolysis of sucrose if the rate law is Rate = k′[C₁₂H₂₂O₁₁]?
(a) Order zero, molecularity one
(b) Order two, molecularity two
(c) Order two, molecularity one
(d) Order one, molecularity two

Q7. The electronic configuration of Ni in the complex Ni(CO)₄ would be:
(a) t₂⁶e⁴
(b) t₂⁶e²
(c) e⁴t₂⁶
(d) e⁴t₂⁴

Q8. Ankit has been given a primary amine, a secondary amine, a secondary alcohol and a tertiary alcohol. Which reagent can identify all?
(a) Tollen’s reagent and bromine water
(b) 2,4-DNP and Lucas reagent
(c) Hinsberg’s reagent and Lucas reagent
(d) Sodium metal and Hinsberg’s reagent

Q9. Which of the following is not true about enzymes?
(a) All enzymes are fibrous proteins
(b) Enzymes are needed in small quantities
(c) Enzymes reduce activation energy
(d) Enzymes are specific

Q10. Identify products (1) and (2):
C₂H₅Cl + KCN → (1)
C₂H₅Cl + KNO₂ → (2)
(a) (1) C₂H₅CN (2) C₂H₅NO₂
(b) (1) C₂H₅NC (2) C₂H₅NO₂
(c) (1) C₂H₅CN (2) C₂H₅ONO
(d) (1) C₂H₅NC (2) C₂H₅ONO

Q11. “Greater number of electrons from (n−1)d in addition to ns electrons are involved in metallic bonding.” Which case results from this?
(a) Vanadium forms complexes
(b) Platinum acts as catalyst
(c) Chromium has higher melting point than V and Mn
(d) Manganese shows +2 to +7 oxidation states

Q12. Which reaction can be used to obtain benzaldehyde from benzene?
(a) Rosenmund reduction
(b) Stephen’s reaction
(c) Etard reaction
(d) Gattermann-Koch reaction

Q13.
Assertion (A): Phenol with Br₂ in CS₂ gives ortho and para bromophenol.
Reason (R): CS₂ is a low-polarity solvent leading to monobromination.
(a) Both true and R explains A
(b) Both true but R does not explain A
(c) A true, R false
(d) A false, R true

Q14.
Assertion (A): At high pressure, decomposition of ammonia is first order.
Reason (R): Concentration of ammonia on catalyst surface does not change.
(a) Both true and R explains A
(b) Both true but R does not explain A
(c) A true, R false
(d) A false, R true

Q15.
Assertion (A): Ionisation enthalpy of Fe²⁺ is lower than Mn²⁺.
Reason (R): Fe²⁺ has 3d⁵4s¹ configuration.
(a) Both true and R explains A
(b) Both true but R does not explain A
(c) A true, R false
(d) A false, R true

Q16.
Assertion (A): Halogens are ortho-para directing.
Reason (R): Halogens are electron-withdrawing.
(a) Both true and R explains A
(b) Both true but R does not explain A
(c) A true, R false
(d) A false, R true

SECTION B

Q17.
(a) Out of Co³⁺ and Cr²⁺ which liberates hydrogen from dilute acid and why?
(b) Why are transition metals effective catalysts? Name catalyst in Haber process.

Q18. Comment on sigma and pi bonding in metal carbonyls.

Q19.
(a) Give amines with basic strength greater and less than N-methylmethanamine (gas).
(b) Give isomeric amines with boiling point less and more than N-ethyl ethanamine.

Q20. Consider reactions:
H₂O₂ + I⁻ → H₂O + IO⁻
H₂O₂ + IO⁻ → H₂O + I⁻ + O₂

Q21.
(a) Write the rate law.
(b) Effect on rate if peroxide concentration is doubled.
OR
Half-life based question on samples A and B.

Q22. Arrange:
(a) n-Butane, propan-1-ol, propanal, acetone, methoxymethane (boiling point)
(b) Acetaldehyde, acetone, acetophenone (reactivity)

SECTION C

Q23. Energy diagram of hydrogenation of ethene – answer parts (a), (b), (c).

Q24.
(a) Endothermic mixing of liquids
(b) Osmotic pressure relation
(c) Melting point comparison

Q25. Give reasons related to EDTA complex, high-spin complexes and colour change of Ti³⁺ complex.
OR
Coordination chemistry question.

Q26. Identify compounds A, B, C from organic reactions.

Q27. KMnO₄ and KI reaction – reactions, reason and structure of MnO₄⁻.

Q28. Electrolysis of aqueous CuSO₄ – identify current types and products.

SECTION D

Q29. Case-based question on bends in divers and Henry’s law.

Q30. Case-based question on reactions of chloroethane and chlorobenzene.
OR
Product formation question.

SECTION E

Q31. Organic chemistry structure, acidity and identification question.
OR
Organic conversions and oxidation question.

Q32. Electrochemistry numerical and cell potential question.
OR
Galvanic cell and conductivity graph.

Q33.
(a) Carbohydrate structure, linkage and Haworth projection
(b) Disaccharide identification
(c) Inversion of sucrose
OR
Nucleic acid and protein structure question.