PYQ Vault

Day 99: MH HSC Class 12 Chemistry

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

  1. Question 1

    Aldehydes, Ketones and Carboxylic Acids. Asked once: Mar 2017

    Q.6.iii
    How is ethanoic acid prepared from dry ice??

  2. Question 2

    Chemical Thermodynamics. Asked once: Mar 2016

    Q.1.vii
    Describe enthalpy of sublimation. How is it related to enthalpy of fusion and enthalpy of vaporization?

  3. Question 3

    Aldehydes, Ketones and Carboxylic Acids. Asked once: Mar 2017

    Q.7
    Define racemic mixture. Give the IUPAC\text{IUPAC} name of \text{of }.

  4. Question 4

    Chemical Thermodynamics. Asked once: Mar 2016

    Q.3.iii
    Calculate C-Cl\text{C-Cl} bond enthalpy from the following reaction: CH3Cl(g)+Cl2(g)→CH2Cl2(g)+HCl(g)\text{CH}_{3}\text{Cl}(g) + \text{Cl}_{2}(g) \rightarrow \text{CH}_{2}\text{Cl}_{2}(g) + \text{HCl}(g); ΔH∘=−104 kJ\Delta\text{H}^{\circ} = - 104\text{ kJ}. If CH4,CH3Cl,CH2Cl2 and H-Cl\text{CH}_{4},\text{CH}_{3}\text{Cl},\text{CH}_{2}\text{Cl}_{2}\text{ and H-Cl} bond enthalpies are 414,243,431 and 431 kJ mol−1414,243,431\text{ and }431\text{ kJ mol}^{- 1} respectively.

  5. Question 5

    Aldehydes, Ketones and Carboxylic Acids. Asked once: Mar 2015

    Q.6.ii
    How is ethylamine prepared from methyl iodide?