PYQ Vault

Day 24: 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 4 times: Mar 2015, Mar 2017, Mar 2022, Feb 2025. This one: Feb 2025

    Q.26
    Mention the types of polymers formed on the basis of intermolecular forces. Write any two uses of low density polyethylene.

  2. Question 2

    Chemical Thermodynamics. This type asked 4 times: Mar 2017, Mar 2022, Feb 2024, Jul 2024. This one: Jul 2024

    Q. 18
    Calculate the standard enthalpy of the reaction : SiO2(s)+3C(graphite)→SiC(s)+2CO(g)\mathrm{SiO_{2(s)} + 3C_{(graphite)} \rightarrow SiC_{(s)} + 2CO_{(g)}} from the following reactions : (i) Si(s)+O2(g)→SiO2(s)\mathrm{Si_{(s)} + O_{2(g)} \rightarrow SiO_{2(s)}}, ΔrH∘=−911 kJ\Delta_r H^{\circ} = -911\ \mathrm{kJ} (ii) 2C(graphite)+O2(g)→2CO(g)\mathrm{2C_{(graphite)} + O_{2(g)} \rightarrow 2CO_{(g)}}, ΔrH∘=−221 kJ\Delta_r H^{\circ} = -221\ \mathrm{kJ} (iii) Si(s)+C(graphite)→SiC(s)\mathrm{Si_{(s)} + C_{(graphite)} \rightarrow SiC_{(s)}}, ΔrH∘=−65.3 kJ\Delta_r H^{\circ} = -65.3\ \mathrm{kJ}

  3. Question 3

    Electrochemistry. This type asked 4 times: Mar 2014, Mar 2017, Mar 2019, Mar 2023. This one: Mar 2023

    Answer the following questions:
    Q.2.viii
    Calculate molar conductivity for 0.5 M BaCl2\mathrm{BaCl_2} if its conductivity at 298 K is 0.01 Ω−1 cm−10.01\ \Omega^{-1}\ \mathrm{cm^{-1}}.

  4. Question 4

    Amines. This type asked 3 times: Feb 2020, Feb 2024, Jun 2026. This one: Jun 2026

    Select and write the correct answers for the following multiple choice type of questions :
    Q.1.viii
    Preparation of ethanamine from acetonitrile represents −-

    Tap an option to check your answer.

  5. Question 5

    Biomolecules. This type asked 3 times: Mar 2023, Feb 2024, Jun 2026. This one: Feb 2024

    Select and write the correct answer for the following multiple choice type of questions :
    Q.1.ii
    The linkage present in Lactose is _____.

    Tap an option to check your answer.