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Day 353: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 27 Jul 2022 (same type asked 7 times) See all 7 of this type

    31
    250 g250\text{ }g solution of DD-glucose in water contains 10.8%10.8\% of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are H,1u;C,12u;O,16uH,1u;C,12u;O,16u )

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 14 Jun 2022 (same type asked 7 times) See all 7 of this type

    31
    If a rocket runs on a fuel (C15H30)\left( C_{15}H_{30} \right) and liquid oxygen, the weight of oxygen required and CO2CO_{2} released for every litre of fuel respectively are: (Given: density of the fuel is 0.756 g/mL0.756\text{ }g/mL )

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  3. Question 3

    Equilibrium. Asked once: 26 Jul 2022 (same type asked 6 times) See all 6 of this type

    56
    At 298 K298\text{ }K, the equilibrium constant is 2×10152 \times10^{15} for the reaction:
    Cu(s)+2Ag+(aq)⇌Cu2+(aq)+2Ag(s)Cu(s) + 2Ag^{+}(aq) \rightleftharpoons Cu^{2 +}(aq) + 2Ag(s)
    The equilibrium constant for the reaction
    12Cu2+(aq)+Ag(s)⇌12Cu(s)+Ag+(aq)\frac{1}{2}Cu^{2 +}(aq) + Ag(s) \rightleftharpoons\frac{1}{2}Cu(s) +Ag^{+}(aq)
    is x×10−8x \times10^{- 8}. The value of xx is (Nearest Integer)

  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 25 Jun 2022 (same type asked 6 times) See all 6 of this type

    35
    Number of electron deficient molecules among the following PH3, B2H6,CCl4,NH3,LiHPH_{3},{\text{ }B}_{2}H_{6},CCl_{4},NH_{3},LiH and BCl3BCl_{3} is

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  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 25 Jan 2023 (same type asked 6 times) See all 6 of this type

    143
    Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8%85.8\% carbon is (Given: Molar mass of A=84 g mol−1A = 84\text{ }g{\text{ }mol}^{- 1} )