PYQ Vault

Day 220: JEE Mains Chemistry

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

  1. Question 1

    Biomolecules. Asked once: 10 Apr 2023 (same type asked 6 times) See all 6 of this type

    38
    The one that does not stabilize 2∘2^{\circ} and 3∘3^{\circ} structures of proteins is

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 21 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    32
    14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K . Which of the following statements is incorrect? [Given : Molar mass in gmol−1gmol^{- 1} of Ca−40,Cl−35.5,H−1Ca - 40,Cl - 35.5,H - 1 ]

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  3. Question 3

    The p-Block Elements. Asked once: 4 Apr 2025 (same type asked 6 times) See all 6 of this type

    37
    Given below are two statements : Statement I : Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of pπ−pπp\pi - p\pi bond with oxygen . Statement II : Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it. In the light of given statements, choose the correct answer from the options given below.

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  4. Question 4

    Hydrocarbons. Asked once: 23 Jan 2025 (same type asked 6 times) See all 6 of this type

    125
    A compound ' X ' absorbs 2 moles of hydrogen and ' X ' upon oxidation with KMnO4/H+KMnO_{4}/H^{+} gives the three products shown (propanone, ethanoic acid and 4-oxopentanoic acid). The total number of σ\sigma bonds present in the compound ' X ' is ______\_\_\_\_\_\_ .
  5. Question 5

    Chemical Bonding and Molecular Structure. Asked once: 13 Apr 2023 (same type asked 6 times) See all 6 of this type

    34
    In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one?

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