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Day 302: JEE Mains Chemistry

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

  1. Question 1

    Chemical Thermodynamics. Asked once: 11 Apr 2023 (same type asked 4 times) See all 4 of this type

    56
    Solid fuel used in rocket is a mixture of Fe2O3Fe_{2}O_{3} and AlAl (in ratio 1:21:2 ). The heat evolved (kJ)(kJ) per gram of the mixture is___ (Nearest integer) Given: ΔHfθ(Al2O3)=−1700 kJ mol−1\Delta H_{f}^{\theta}\left( Al_{2}O_{3} \right)= - 1700\text{ }kJ{\text{ }mol}^{- 1}
    ΔHf⊖(Fe2O3)=−840 kJ mol−1\Delta H_{f}^{\ominus}\left( Fe_{2}O_{3} \right)= - 840\text{ }kJ{\text{ }mol}^{- 1}
    Molar mass of Fe,AlFe,Al and OO are 56,27 and 16 g16\text{ }g mol−1mol^{- 1} respectively.

  2. Question 2

    Classification of Elements and Periodicity. Asked once: 2021 Paper 25 (same type asked 4 times) See all 4 of this type

    46
    Match List-I with List-II. List -I List-II Electronic ΔiH\Delta_{i}H in kJmol−1kJmol^{- 1} configuration of elements (A) 1s22s21s^{2}2s^{2} (i) 801 (B) 1s22s22p41s^{2}2s^{2}2p^{4} (ii) 899 (C) 1s22s22p31s^{2}2s^{2}2p^{3} (iii) 1314 (D) 1s22s22p11s^{2}2s^{2}2p^{1} (iv) 1402

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  3. Question 3

    Solutions. Asked once: 27 Jan 2024 (same type asked 4 times) See all 4 of this type

    37
    A solution of two miscible liquids showing negative deviation from Raoult's law will have:

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  4. Question 4

    Biomolecules. Asked once: 2021 Paper 10 (same type asked 4 times) See all 4 of this type

    36
    Deficiency of vitamin KK causes:

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  5. Question 5

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

    55
    The value of log⁡K\log K for the reaction A⇋BA \leftrightharpoons B at 298 K298\text{ }K is (Nearest integer) Given: ΔH0=−54.07 kJ mol−1\Delta H^{0}= - 54.07\text{ }kJ{\text{ }mol}^{- 1}
    ΔS∘=10JK−1 mol−1\Delta S^{\circ}= 10JK^{- 1}{\text{ }mol}^{- 1}
    (( Take 2.303×8.314×298=5705)2.303 \times 8.314 \times 298 = 5705)