PYQ Vault

Day 19: MH HSC Class 12 Chemistry

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

  1. Question 1

    Introduction to Polymer Chemistry. This type asked 6 times: Mar 2016, Mar 2018, Mar 2019, Feb 2020, Feb 2024, Jul 2025. This one: Jul 2025

    Q. 25
    (a) Write chemical reaction for preparation of Teflon. (b) Write structure of monomer of natural rubber. (c) Give two uses of high density polyethene [HDP].

  2. Question 2

    Chemical Kinetics. This type asked 5 times: Mar 2016, Mar 2019, Mar 2023, Jul 2024, Jun 2026. This one: Mar 2023

    Q. 27(i)
    Show that, time required for 99.9% completion of a first order reaction is three times the time required for 90% completion.

  3. Question 3

    Coordination Compounds. This type asked 5 times: Mar 2014, Mar 2017, Feb 2020, Feb 2024, Feb 2026. This one: Feb 2026

    Q. 29(i)
    Calculate effective atomic number of Fe2+\mathrm{Fe^{2+}} in [Fe(CN)6]4−\mathrm{[Fe(CN)_6]^{4-}} [Given : (Z = 26)]

  4. Question 4

    Coordination Compounds. This type asked 5 times: Mar 2015, Feb 2020, Jul 2024, Feb 2025, Feb 2026. This one: Feb 2026

    Select and write the correct answer for the following multiple choice type of questions :
    Q.1.vii
    The co-ordination complex ions [Co(NH3)5(NO2)]2+\mathrm{[Co(NH_3)_5(NO_2)]^{2+}} and [Co(NH3)5(ONO)]2+\mathrm{[Co(NH_3)_5(ONO)]^{2+}} are _____ of each other.

    Tap an option to check your answer.

  5. Question 5

    Transition and Inner Transition Elements. This type asked 5 times: Mar 2019, Feb 2024, Jul 2024, Feb 2025, Feb 2026. This one: Feb 2026

    Q. 19(i)
    (i) Write observed electronic configuration of chromium (Z = 24). (ii) Calculate magnetic moment of Ti3+\mathrm{Ti^{3+}} by using spin only formula. (Z of Ti = 22)