PYQ Vault

Day 32: MH HSC Class 12 Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Chemical Kinetics. This type asked 2 times: Feb 2025, Feb 2026. This one: Feb 2026

    Q. 13
    A chemical reaction occurs in two steps : (i) NO2Cl(g)→slowNO2(g)+Cl(g)\mathrm{NO_2Cl_{(g)} \xrightarrow{slow} NO_{2(g)} + Cl_{(g)}} (ii) NO2Cl(g)+Cl(g)→fastNO2(g)+Cl2(g)\mathrm{NO_2Cl_{(g)} + Cl_{(g)} \xrightarrow{fast} NO_{2(g)} + Cl_{2(g)}} (a) Write down the rate law. (b) Identify the reaction intermediate.

  2. Question 2

    Chemical Kinetics. This type asked 2 times: Mar 2019, Feb 2026. This one: Feb 2026

    Q. 26(ii)
    The rate of A+B→P\mathrm{A + B \rightarrow P} is 3.6×10−2 mol/dm3/s3.6 \times 10^{-2}\ \mathrm{mol/dm^{3}/s}. When [A] = 0.2 M and [B] = 0.1 M. Calculate the rate constant if reaction is first order in B and second order in A.

  3. Question 3

    Halogen Derivatives. This type asked 2 times: Feb 2024, Feb 2026. This one: Feb 2026

    Select and write the correct answer for the following multiple choice type of questions :
    Q.1.iii
    Acetonitrile may be prepared by heating the following reactants :

    Tap an option to check your answer.

  4. Question 4

    Aldehydes, Ketones and Carboxylic Acids. This type asked 2 times: Mar 2022, Jul 2025. This one: Jul 2025

    Q. 14
    Write a note on Haloform reaction.

  5. Question 5

    Amines. This type asked 2 times: Jul 2024, Jul 2025. This one: Jul 2025

    Q. 23
    (a) What is the action of following on ethylamine −- (i) Hinsberg reagent (ii) Nitrous acid (b) Write increasing order of basicity for CH3NH2\mathrm{CH_3NH_2}, (CH3)2NH\mathrm{(CH_3)_2NH} and (CH3)3N\mathrm{(CH_3)_3N}