PYQ Vault

Day 533: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 29 Jul 2022

    123
     C(s)+O2( g)→CO2( g)+400 kJ\ C(s) +O_{2}(\text{ }g) \rightarrow CO_{2}(\text{ }g) + 400\text{ }kJ
    C(s)+12O2( g)→CO(g)+100 kJC(s) +\frac{1}{2}O_{2}(\text{ }g) \rightarrow CO(g) + 100\text{ }kJ
    When coal of purity 60%60\% is allowed to burn in presence of insufficient oxygen, 60%60\% of carbon is converted into ' COCO ' and the remaining is converted into ' CO2 ′CO_{2}\ ^{'} '. The heat generated when 0.6 kg0.6\text{ }kg of coal is burnt is____

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  2. Question 2

    Classification of Elements and Periodicity. Asked once: 29 Jun 2022

    126
    Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason RR : The four electrons in 2p2p orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct answer from the options given below.

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  3. Question 3

    Haloalkanes and Haloarenes. Asked once: 28 Jun 2022

    135
    In the above reaction ' AA ' is

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  4. Question 4

    Hydrocarbons. Asked once: 31 Jan 2024

    126
    Major product of the following reaction is -

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  5. Question 5

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 27 Jan 2024

    132
    Bond line formula of HOCH(CN)2HOCH(CN)_{2} is:

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