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Day 204: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. Asked once: 28 Jul 2022 (same type asked 2 times) See all 2 of this type

    50
    For kinetic study of the reaction of iodide ion with H2O2H_{2}O_{2} at room temperature: (A) Always use freshly prepared starch solution. (B) Always keep the concentration of sodium thiosulphate solution less than that of KI solution. (C) Record the time immediately after the appearance of blue colour. (D) Record the time immediately before the appearance of blue colour. (E) Always keep the concentration of sodium thiosulphate solution more than that of KI solution. Choose the correct answer from the options given below:

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  2. Question 2

    Coordination Compounds. Asked once: 2021 Paper 22 (same type asked 2 times) See all 2 of this type

    43
    The denticity of an organic ligand, biuret is:

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  3. Question 3

    Equilibrium. Asked once: 25 Jul 2022 (same type asked 2 times) See all 2 of this type

    34
    20 mL20\text{ }mL of 0.1MNH4OH0.1MNH_{4}OH is mixed with 40 mL40\text{ }mL of 0.05MHCl0.05MHCl. The pHpH of the mixture is nearest to: (Given: Kb(NH4OH)=1×10−5,log⁡2=0.30K_{b}\left( NH_{4}OH \right)= 1 \times10^{- 5},\log2 = 0.30, log⁡3=0.48,log⁡5=0.69,log⁡7=0.84\log3 = 0.48,\log5 = 0.69,\log7 = 0.84, log⁡11=1.04)\log11 = 1.04)

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  4. Question 4

    Chemical Kinetics. Asked once: 14 Jun 2022 (same type asked 2 times) See all 2 of this type

    55
    The rate constants for decomposition of acetaldehyde have been measured over the temperature range 00−1000 K00 - 1000\text{ }K. The data has been analysed by plotting ln⁡k\ln k vs 103 T\frac{10^{3}}{\text{ }T} graph. The value of activation energy for the reaction is ____\_\_\_\_ kJ mol−1kJ\ mol^{- 1} (Nearest integer) (Given : R=8.31 J K−1 mol−1R = 8.31\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} )

  5. Question 5

    Solutions. Asked once: 25 Jul 2022 (same type asked 2 times) See all 2 of this type

    122
    Two solutions AA and BB are prepared by dissolving 1 g1\text{ }g of non-volatile solutes XX and YY. respectively in 1 kg1\text{ }kg of water. The ratio of depression in freezing points for AA and BB is found to be 1:41:4. The ratio of molar masses of XX and YY is:

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