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Day 29: JEE Mains Chemistry

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

  1. Question 1

    Solutions. This type asked 4 times: 27 Jan 2024, 31 Jan 2024, 23 Jan 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 4 of this type

    27
    Given below are two statements : Given : Molar mass of C,H,O,ClC,H,O,Cl are 12,1,1612,1,16 and 35.5 g mol−135.5\text{ }g{\text{ }mol}^{- 1}, respectively. Statement I : In 30%(w/w)30\%(w/w) solution of methanol in CCl4{CCl}_{4} (at T K ), the mole fraction of CCl4{CCl}_{4} is equal to 0.33 . Statement II : Mixture of methanol and CCl4{CCl}_{4} shows positive deviation from Raoult's law. In the light of the above statements, choose the correct answer from the option given below :

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  2. Question 2

    Some Basic Concepts of Chemistry. This type asked 4 times: 28 Jun 2022, 26 Jul 2022, 28 Jan 2026 S1, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 4 of this type

    48
    500 mL of 0.2MMnO4−0.2M{MnO}_{4}^{-}solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard x M thiosulphate solution in presence of starch till the end point. If 300 mL of thiosulphate was consumed, then the value of x is ____\_\_\_\_ .

  3. Question 3

    The d- and f-Block Elements. This type asked 4 times: 1 Feb 2024, 4 Apr 2025, 22 Jan 2026 S2, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 4 of this type

    35
    The correct order of first (ΔiH1)\left( \Delta_{i}H_{1} \right) and second (ΔiH2)\left( \Delta_{i}H_{2} \right) ionisation enthalpy values of Cr and Mn are : (A) ΔiH1:Cr>Mn\Delta_{i}H_{1}:Cr > Mn (B) ΔiH2:Cr>Mn\Delta_{i}H_{2}:Cr > Mn (C) ΔiH1:Mn>Cr\Delta_{i}H_{1}:Mn > Cr (D) ΔiH2:Mn>Cr\Delta_{i}H_{2}:Mn > Cr Choose the correct answer from the options given below :

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  4. Question 4

    Biomolecules. This type asked 4 times: 2021 Paper 10, 2021 Paper 25, 6 Apr 2023, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 4 of this type

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

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  5. Question 5

    Chemical Thermodynamics. This type asked 4 times: 6 Apr 2023, 27 Jan 2024, 21 Jan 2026 S1, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 4 of this type

    50
    Consider the reaction X⇌YX \rightleftharpoons Y at 300 K . If ΔHθ\Delta H^{\theta} and K are 28.40 kJ mol−128.40\text{ }kJ{\text{ }mol}^{- 1} and 1.8×10−71.8 \times 10^{- 7} at the same temperature, then the magnitude of ΔSθ\Delta S^{\theta} for the reaction in JK−1 mol−1JK^{- 1}{\text{ }mol}^{- 1} is ____\_\_\_\_ .(Nearest Integer). (Given : R=8.3JK−1 mol−1,ln⁡10=2.3R = 8.3{JK}^{- 1}{\text{ }mol}^{- 1},\ln10 = 2.3, log⁡3=0.48,log⁡2=0.30\log3 = 0.48,\log2 = 0.30