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Day 20: JEE Mains Chemistry

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

  1. Question 1

    Chemical Kinetics. This type asked 5 times: 2021 Paper 21, 27 Jun 2022, 29 Jun 2022, 31 Jan 2023, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 5 of this type

    49
    For reaction A→PA \rightarrow P, rate constant k=1.5×103 s−1k = 1.5 \times 10^{3}{\text{ }s}^{- 1} at 27∘C27^{\circ}C. If activation energy for the above reaction is 60 kJ mol−160\text{ }kJ{\text{ }mol}^{- 1}, then the temperature (in  ∘C\ ^{\circ}C ) at which rate constant, k=4.5×103 s−1k = 4.5 \times 10^{3}{\text{ }s}^{- 1} is ____\_\_\_\_ . (Nearest integer) Given : log⁡2=0.30,log⁡3=0.48,R=8.3 J K−1 mol−1\log2 = 0.30,\log3 = 0.48,R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1}, ln⁡10=2.3\ln10 = 2.3

  2. Question 2

    Solutions. This type asked 5 times: 2021 Paper 13, 2021 Paper 22, 30 Jan 2024, 22 Jan 2025, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 5 of this type

    39
    Consider the following aqueous solutions. (I) 2.2 g Glucose in 125 mL of solution. (II) 1.9 g Calcium chloride in 250 mL of solution. (III) 9.0 g Urea in 500 mL of solution. (IV) 20.5 g Aluminum sulphate in 750 mL of solution. The correct increasing order of boiling point of these solutions will be: [Given: Molar mass in gmol−1:H=1,C=12, N=14gmol^{- 1}:H = 1,C = 12,\text{ }N = 14, O=16,Cl=35.5,Ca=40,Al=27O = 16,Cl = 35.5,Ca = 40,Al = 27 and S=32S = 32 ]

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  3. Question 3

    The p-Block Elements. This type asked 5 times: 2021 Paper 1, 29 Jul 2022, 29 Jan 2023, 31 Jan 2023, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 5 of this type

    42
    Consider the following reactions. Na2B4O7→Δ2X+Y\mathrm{Na_2B_4O_7 \xrightarrow{\Delta} 2X + Y} CuSO4+Y→non-luminous flameZ+SO3\mathrm{CuSO_4 + Y \xrightarrow{\text{non-luminous flame}} Z + SO_3} 2Z+2X+C→luminous flame2Q+Na2B4O7+CO\mathrm{2Z + 2X + C \xrightarrow{\text{luminous flame}} 2Q + Na_2B_4O_7 + CO} The oxidation states of Cu in Z and Q, respectively are:

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  4. Question 4

    Solutions. This type asked 5 times: 28 Jul 2022, 24 Jan 2023, 2 Apr 2025, 23 Jan 2026 S2, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 5 of this type

    28
    At T(K),2T(K),2 moles of liquid A and 3 moles of liquid BB are mixed. The vapour pressure of ideal solution formed is 320 mm Hg . At this stage, one mole of A and one mole of BB are added to the solution. The vapor pressure is now measured as 328.6 mm Hg . The vapour pressure (in mm Hg ) of A and B are respectively:

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  5. Question 5

    Biomolecules. This type asked 5 times: 24 Jan 2023, 29 Jan 2023, 1 Feb 2024, 2 Apr 2025, 24 Jan 2026 S2. This one: 24 Jan 2026 S2 See all 5 of this type

    28
    The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is :

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