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Day 122: JEE Mains Chemistry

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

  1. Question 1

    Coordination Compounds. Asked once: 21 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    40
    Given below are two statements: Statement I: Among [Cu(NH3)4]2+,[Ni(en)3]2+\left\lbrack Cu\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +},\left\lbrack Ni(en)_{3} \right\rbrack^{2 +}, [Ni(NH3)6]2+\left\lbrack Ni\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} and [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}, [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +} has the maximum number of unpaired electrons. Statement II: The number of pairs among {[NiCl4]2−,[Ni(CO)4]},{[NiCl4]2−,[Ni(CN)4]2−}\left\{ \left\lbrack {NiCl}_{4} \right\rbrack^{2 -},\left\lbrack Ni(CO)_{4} \right\rbrack \right\},\left\{ \left\lbrack {NiCl}_{4} \right\rbrack^{2 -},\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} \right\} and {[Ni(CO)4], [Ni(CN)4]2−}\left\{ \left\lbrack Ni(CO)_{4} \right\rbrack,\ \left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} \right\} that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below:

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  2. Question 2

    Some Basic Concepts of Chemistry. Asked once: 28 Jan 2025 (same type asked 6 times) See all 6 of this type

    47
    Quantitative analysis of an organic compound (X) shows following % composition. C : 14.5% Cl : 64.46% H: 1.8%, the rest being oxygen. The empirical formula mass of the compound (X) is _____\_\_\_\_\_ ×10−1\times10^{- 1} (Given molar mass in gmol−1gmol^{- 1} of C:12,H:1C:12,H:1, O:16,Cl:35.5)O:16,Cl:35.5)

  3. Question 3

    Structure of Atom. Asked once: 1 Feb 2024 (same type asked 6 times) See all 6 of this type

    133
    The number of radial node/s for 3p3p orbital is:

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  4. Question 4

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

    103
    The α\alpha - Helix and β\beta - Pleated sheet structures of protein are associated with its:

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  5. Question 5

    Some Basic Concepts of Chemistry. Asked once: 22 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    31
    In the reaction, 2Al(s)+6HCl(aq)→2Al3+(aq)+6Cl−(aq)+3H2(g)2Al(s) + 6HCl(aq) \rightarrow 2Al^{3 +}(aq) + 6Cl^{-}(aq) + 3H_{2}(g), which of the following statements is correct?

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