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Day 41: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. This type asked 4 times: 26 Jun 2022, 29 Jan 2024, 31 Jan 2024, 28 Jan 2025. This one: 28 Jan 2025 See all 4 of this type

    48
    The molarity of a 70%70\% (mass // mass) aqueous solution of a monobasic acid (X) is ____\_\_\_\_ M(Nearest integer) [Given : Density of aqueous solution of (X)(X) is 1.25 g mL−11.25\text{ }g{\text{ }mL}^{- 1} Molar mass of the acid is 70 g mol−170\text{ }g{\text{ }mol}^{- 1} ]

  2. Question 2

    Equilibrium. This type asked 4 times: 14 Jun 2022, 29 Jun 2022, 22 Jan 2025, 24 Jan 2025. This one: 24 Jan 2025 See all 4 of this type

    46
    37.8 g N2O537.8\text{ }g{\text{ }N}_{2}O_{5} was taken in a 1 L reaction vessel and allowed to undergo the following reaction at 500 K
    2 N2O5( g)→2 N2O4( g)+O2( g)2{\text{ }N}_{2}O_{5(\text{ }g)}\rightarrow 2{\text{ }N}_{2}O_{4(\text{ }g)}+O_{2(\text{ }g)}
    The total pressure at equilibrium was found to be 18.65 bar. Then, Kp=Kp = _____\_\_\_\_\_ ×10−2\times10^{- 2} [nearest integer] Assume N2O5N_{2}O_{5} to behave ideally under these conditions Given : R=0.082R = 0.082 bar Lmol−1 K−1Lmol^{- 1}{\text{ }K}^{- 1}

  3. Question 3

    Equilibrium. This type asked 4 times: 2021 Paper 4, 25 Jun 2022, 29 Jul 2022, 24 Jan 2025. This one: 24 Jan 2025 See all 4 of this type

    32
    Ksp for Cr(OH)3Cr(OH)_{3} is 1.6×10−301.6 \times10^{- 30}. What is the molar solubility of this salt in water?

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  4. Question 4

    Alcohols, Phenols and Ethers. This type asked 4 times: 8 Apr 2023, 1 Feb 2024, 5 Apr 2024, 23 Jan 2025. This one: 23 Jan 2025 See all 4 of this type

    107
    Given below are two statements: Statement (I). The boiling points of alcohols and phenols increase with increase in the number of C -atoms. Statement (II): The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes. In the light of the above statements, choose the correct answer from the options given below:

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  5. Question 5

    The d- and f-Block Elements. This type asked 4 times: 2021 Paper 25, 14 Jun 2022, 8 Apr 2024, 23 Jan 2025. This one: 23 Jan 2025 See all 4 of this type

    120
    Consider the following reactions
    K2Cr2O7→KOH−H2O[ A]→H2SO4−H2O[ B]+K2SO4K_{2}Cr_{2}O_{7}\underset{-H_{2}O}{\overset{KOH}{\rightarrow}}\lbrack\text{ }A\rbrack\underset{-H_{2}O}{\overset{H_{2}SO_{4}}{\rightarrow}}\lbrack\text{ }B\rbrack +K_{2}SO_{4}
    The products [A]\lbrack A\rbrack and [B]\lbrack B\rbrack, respectively are :

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