PYQ Vault

Day 434: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 12 Apr 2023

    39
    A metal chloride contains 55.0%55.0\% of chlorine by weight. 100 mL100\text{ }mL vapours of the metal chloride at STP weigh 0.57 g0.57\text{ }g. The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is 35.5u35.5u )

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  2. Question 2

    Structure of Atom. Asked once: 29 Jan 2025

    102
    For hydrogen like species, which of the following graphs provides the most appropriate representation of E vs Z plot for a constant n ? [E : Energy of the stationary state, Z : atomic number, n=n = principal quantum number]

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  3. Question 3

    The d- and f-Block Elements. Asked once: 31 Jan 2024

    41
    Identify correct statements from below: (A) The chromate ion is square planar. (B) Dichromates are generally prepared from chromates. (C) The green manganate ion is diamagnetic. (D) Dark green coloured K2MnO4K_{2}MnO_{4} disproportionates in a neutral or acidic medium to give permanganate. (E) With increasing oxidation number of transition metal, ionic character of the oxides decreases. Choose the correct answer from the options given below:

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  4. Question 4

    The p-Block Elements. Asked once: 9 Apr 2024

    36
    The F−F^{-}ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

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  5. Question 5

    Alcohols, Phenols and Ethers. Asked once: 8 Apr 2024

    34
    Identify the major products AA and BB respectively in the following set of reactions.

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