PYQ Vault

Day 474: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 29 Jun 2022

    141
    A box contains 0.90 g0.90\text{ }g of liquid water in equilibrium with water vapour at 27∘C27^{\circ}C. The equilibrium vapour pressure of water at 27∘C27^{\circ}C is 32.032.0 Torr. When the volume of the box is increased, some of the liquid water evaporates to maintain the equilibrium pressure. If all the liquid water evaporates, then the volume of the box must be litre. [nearest integer] (Given: R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1} ) (Ignore the volume of the liquid water and assume water vapours behave as an ideal gas.)
  2. Question 2

    Structure of Atom. Asked once: 11 Apr 2023

    34
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface. Reason R: When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place. In the light of the above statements, choose the most appropriate answer from the options given below:

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  3. Question 3

    The d- and f-Block Elements. Asked once: 29 Jul 2022

    36
    The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:

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  4. Question 4

    The p-Block Elements. Asked once: 30 Jan 2024

    34
    Given below are the two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A): There is a considerable increase in covalent radius from NN to PP. However, from As to Bi only a small increase in covalent radius is observed. Reason (R): covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statement, choose the most appropriate answer from the options given below:

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 29 Jan 2024

    37
    The major product( P)P) in the following reaction is

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