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Day 28: JEE Mains Chemistry

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

  1. Question 1

    Amines. This type asked 5 times: 2021 Paper 1, 2021 Paper 4, 2021 Paper 10, 28 Jun 2022, 28 Jul 2022. This one: 28 Jul 2022 See all 5 of this type

    135
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason RR Assertion A: Aniline on nitration yields ortho, meta & para nitro derivatives of aniline. Reason R: Nitrating mixture is a strong acidic mixture. In the light of the above statements, choose the correct answer from the options given below

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  2. Question 2

    The p-Block Elements. This type asked 5 times: 2021 Paper 6, 2021 Paper 9, 2021 Paper 19, 25 Jun 2022, 26 Jul 2022. This one: 26 Jul 2022 See all 5 of this type

    146
    The number of non-ionisable protons present in the product BB obtained from the following reaction is
     . C2H5OH+PCl3→C2H5Cl+A\text{~.~}C_{2}H_{5}OH +PCl_{3}\rightarrow C_{2}H_{5}Cl + A
    A+PCl3→BA +PCl_{3}\rightarrow B

  3. Question 3

    Amines. This type asked 4 times: 2021 Paper 10, 25 Jun 2022, 27 Jun 2022, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    43
    Which statements are True? (A) In Hoffmann bromamide degradation, 4 moles of NaOH and 2 moles of Br2{Br}_{2} are consumed per mole of an amide (B) Hoffmann bromamide reaction is not given by alkyl amides. (C) Primary amines can be synthesized by Hoffmann bromamide degradation. (D) Secondary amide on reaction with Br2{Br}_{2} and NaOH will give secondary amine. (E) The by-products of Hoffmann degradation are Na2CO3,NaBr{Na}_{2}{CO}_{3},NaBr and H2OH_{2}O. Choose the correct answer from the options given below :

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  4. Question 4

    Chemical Thermodynamics. This type asked 4 times: 11 Apr 2023, 30 Jan 2024, 5 Apr 2024, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    49
    Consider the reaction :
    2H2 S( g)+3O2( g)→2H2O(l)+2SO2( g)2H_{2}\text{ }S(\text{ }g) + 3O_{2}(\text{ }g) \rightarrow 2H_{2}O(l) + 2{SO}_{2}(\text{ }g)
    The magnitude of enthalpy change for the reaction in kJmol−1kJ{mol}^{- 1} is ____\_\_\_\_ . (Nearest integer) Given : ΔfH⊖(H2 S)=−20.1 kJ mol−1\Delta_{f}H^{\ominus}\left( H_{2}\text{ }S \right) = - 20.1\text{ }kJ{\text{ }mol}^{- 1}
    ΔfHΘ(H2O)=−286.0 kJ mol−1\Delta_{f}H^{\Theta}\left( H_{2}O \right) = - 286.0\text{ }kJ{\text{ }mol}^{- 1}
    ΔfHΘ(SO2)=−297.0 kJ mol−1\Delta_{f}H^{\Theta}\left( {SO}_{2} \right) = - 297.0\text{ }kJ{\text{ }mol}^{- 1}

  5. Question 5

    Classification of Elements and Periodicity. This type asked 4 times: 2021 Paper 25, 29 Jul 2022, 22 Jan 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    33
    Match List-I with List-II.
    List-I Electronic configuration of neutral atom (where n=2n = 2)List-II 1st1^{st} Ionization Energy (kJ mol−1kJ\,mol^{-1})
    (A)ns2{ns}^{2}(I)2080
    (B)ns2np1ns^{2}np^{1}(II)899
    (C)ns2np3ns^{2}np^{3}(III)800
    (D)ns2np6ns^{2}np^{6}(IV)1402
    Choose the correct answer from the options given below :

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