PYQ Vault

Day 470: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 25 Jul 2022

    53
    The pressure of a moist gas at 27∘C27^{\circ}C is 4 atm4\text{ }atm. The volume of the container is doubled at the same temperature. The new pressure of the moist gas is …×10−1 atm\ldots \times 10^{-1}\text{ }atm. (Nearest integer) (Given: The vapour pressure of water at 27∘C27^{\circ}C is 0.4 atm0.4\text{ }atm)
  2. Question 2

    Structure of Atom. Asked once: 15 Apr 2023

    38
    Given below are two statements: Statement I: According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised. Statement II: The concept of electron in Bohr's orbit, violates the Heisenberg uncertainty principle. 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: 25 Jan 2023

    135
    A chloride salt solution acidified with dil. HNO3HNO_{3} gives a curdy white precipitate, [A], on addition of AgNO3AgNO_{3}. [A] on treatment with NH4OHNH_{4}OH gives a clear solution, BB. A and B are respectively

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  4. Question 4

    The p-Block Elements. Asked once: 31 Jan 2024

    132
    Choose the correct statements from the following (A) All group 16 elements form oxides of general formula EO2EO_{2} and EO3EO_{3} where E=S,Se,TeE = S,Se,Te and Po. Both the types of oxides are acidic in nature. (B) TeO2TeO_{2} is an oxidising agent while SO2SO_{2} is reducing in nature. (C) The reducing property decreases from H2 SH_{2}\text{ }S to H2TeH_{2}Te down the group. (D) The ozone molecule contains five lone pairs of electrons. Choose the correct answer from the options given below:

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 31 Jan 2024

    39
    Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Alcohols react both as nucleophiles and electrophiles. Reason R: Alcohols react with active metals such as sodium, potassium and aluminum to yield corresponding alkoxides and liberate hydrogen. In the light of the above statements, choose the correct answer from the options given below:

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