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Day 139: JEE Mains Chemistry

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

  1. Question 1

    The d- and f-Block Elements. Asked once: 4 Apr 2025 (same type asked 4 times) See all 4 of this type

    102
    The incorrect relationship in the following pairs in relation to ionisation enthalpies is:

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  2. Question 2

    Biomolecules. Asked once: 6 Apr 2023 (same type asked 4 times) See all 4 of this type

    44
    Match List I with List II
    List I (Vitamin)List II (Deficiency)
    (A)Vitamin A(I)Beri-Beri
    (B)Thiamine(II)Cheilosis
    (C)Ascorbic acid(III)Xerophthalmia
    (D)Riboflavin(IV)Scurvy
    Choose the correct answer from the options given below:

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  3. Question 3

    Chemical Thermodynamics. Asked once: 21 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    48
    Use the following data:
    SubstanceΔfH⊖(500 K)/kJ mol−1\Delta_{f}H^{\ominus}(500\text{ }K)/kJ\,mol^{-1}S⊖(500 K)/J K−1mol−1S^{\ominus}(500\text{ }K)/J\,K^{-1}mol^{-1}
    AB(g)AB(g)32222
    A2(g)A_{2}(g)6146
    B2(g)B_{2}(g)x280
    One mole each of A2(g)A_{2}(g) and B2(g)B_{2}(g) are taken in a 1L closed flask and allowed to establish the equilibrium at 500 K .
    A2( g)+B2( g)⇌2AB(g)A_{2}(\text{ }g) + B_{2}(\text{ }g) \rightleftharpoons 2AB(g)
    The value of xx (in kJ mol−1kJ\,mol^{-1}) is ____\_\_\_\_ (Nearest integer) (Given: log⁡K=2.2, R=8.3 JK−1mol−1\log K = 2.2,\ R = 8.3\ JK^{- 1}mol^{- 1} )

  4. Question 4

    Coordination Compounds. Asked once: 6 Apr 2024 (same type asked 4 times) See all 4 of this type

    139
    Match List-I with List-II LIST- I LIST- II Tetrahedral Complex Electronic configuration (A) TiCl4TiCl_{4} (I) e2,t20e^{2},t_{2}^{0} (B) [FeO4]2−\left\lbrack FeO_{4} \right\rbrack^{2 -} (II) e4,t23e^{4},t_{2}^{3} (C) [FeCl4]−\left\lbrack FeCl_{4} \right\rbrack^{-} (III) e0,t20e^{0},t_{2}^{0} (D) [CoCl4]2−\left\lbrack CoCl_{4} \right\rbrack^{2 -} (IV) e2,t23e^{2},t_{2}^{3} Choose the correct answer from the option given below:

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  5. Question 5

    Amines. Asked once: 21 Jan 2026 S1 (same type asked 4 times) See all 4 of this type

    35
    An organic compound (P)(P) on treatment with aqueous ammonia under hot condition forms compound (Q)(Q) which on heating with Br2Br_{2} and KOH forms compound (R) having molecular formula C6H7NC_{6}H_{7}N. Names of P,QP,Q and R respectively are.

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