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Day 520: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. Asked once: 2021 Paper 26

    58
    If the activation energy of a reaction is 80.9 kJ mol−180.9\text{ }kJ{\text{ }mol}^{- 1}, the fraction of molecules at 700 K700\text{ }K, having enough energy to react to form products is e−xe^{-x}. The value of xx is ______. (Rounded off to the nearest integer) [Use R=8.31JK−1 mol−1R = 8.31JK^{- 1}{\text{ }mol}^{- 1}]

  2. Question 2

    Chemical Thermodynamics. Asked once: 31 Jan 2023

    52
    The enthalpy change for the conversion of 12Cl2( g)\frac{1}{2}Cl_{2}\left( \text{ }g \right) to Cl−(aq)Cl^{-}\left( aq \right) is (−)( - ) ____\_\_\_\_ kJ mol−1kJ\,mol^{- 1} (Nearest integer) Given : Δdis HCl2( g)⊖=240 kJ mol−1,ΔegHCl(g)⊖=−350 kJ mol−1,ΔhydH⊖Cl(g)−=−380 kJ mol−1\Delta_{\text{dis~}}H_{Cl_{2\left( \text{ }g \right)}}^{\ominus}= 240\text{ }kJ{\text{ }mol}^{- 1},\Delta_{eg}H_{Cl_{\left( g \right)}}^{\ominus}= - 350\text{ }kJ{\text{ }mol}^{- 1},\Delta_{hyd}H^{\ominus}Cl_{\left( g \right)}^{-}= - 380\text{ }kJ{\text{ }mol}^{- 1}

  3. Question 3

    Classification of Elements and Periodicity. Asked once: 25 Jan 2023

    123
    Given below are two statements, one is labelled as Assertion AA and the other is labelled as Reason RR Assertion A: Carbon forms two important oxides - COCO and CO2CO_{2}. COCO is neutral whereas CO2CO_{2} is acidic in nature Reason RR : CO2CO_{2} can combine with water in a limited way to form carbonic acid, while COCO is sparingly soluble in water In the light of the above statements, choose the most appropriate answer from the options given below

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  4. Question 4

    Haloalkanes and Haloarenes. Asked once: 24 Jan 2023

    49
    Assertion A: Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases. Reason R:I−R:I^{-}is a good nucleophile as well as a good leaving group. In the light of the above statements, choose the correct answer from the options given below

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  5. Question 5

    Hydrocarbons. Asked once: 5 Apr 2024

    133
    Consider the given chemical reaction: Product "A" is:

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