PYQ Vault

Day 283: JEE Mains Chemistry

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

  1. Question 1

    Alcohols, Phenols and Ethers. Asked once: 10 Apr 2023 (same type asked 8 times) See all 8 of this type

    134
    The correct order for acidity of the following hydroxyl compound is: Choose the correct answer from the options given below:

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  2. Question 2

    The p-Block Elements. Asked once: 1 Feb 2024 (same type asked 7 times) See all 7 of this type

    38
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : PH3PH_{3} has lower boiling point than NH3NH_{3}. Reason (R) : In liquid state NH3NH_{3} molecules are associated through vander waal's forces, but PH3PH_{3} molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:

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  3. Question 3

    Structure of Atom. Asked once: 22 Jan 2025 (same type asked 7 times) See all 7 of this type

    34
    Radius of the first excited state of Helium ion is given as : a0→a_{0}\rightarrow radius of first stationary state of hydrogen atom.

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  4. Question 4

    Chemical Kinetics. Asked once: 31 Jan 2024 (same type asked 7 times) See all 7 of this type

    142
    r=k[A]r = k\lbrack A\rbrack for a reaction, 50%50\% of AA is decomposed in 120 minutes. The time taken for 90%90\% decomposition of AA is ____ minutes.
  5. Question 5

    Solutions. Asked once: 12 Apr 2023 (same type asked 7 times) See all 7 of this type

    56
    80 mole percent of MgCl2MgCl_{2} is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of MgCl2MgCl_{2} at 38∘C38^{\circ}C is ____mm Hg. (Nearest integer) Given: Vapour pressure of water at 38∘C38^{\circ}C is 50 mmHgmmHg