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Day 210: JEE Mains Chemistry

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

  1. Question 1

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 7 Apr 2025 (same type asked 10 times) See all 10 of this type

    46
    An organic compound weighing 500 mg , produced 220 mg of CO2{CO}_{2}. on complete combustion. The percentage composition of carbon in the compound is ____ %\%. (nearest integer) (Given molar mass in gmol−1g{mol}^{- 1} of C:12,O:16C:12,O:16 )

  2. Question 2

    Coordination Compounds. Asked once: 5 Apr 2024 (same type asked 10 times) See all 10 of this type

    41
    Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr=24,Mn=25,Fe=26,Co=27Cr = 24,Mn = 25,Fe = 26,Co = 27 ]

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  3. Question 3

    Chemical Bonding and Molecular Structure. Asked once: 11 Apr 2023 (same type asked 10 times) See all 10 of this type

    148
    The maximum number of lone pairs of electrons on the central atom from the following species is__ ClO3 −,XeF4,SF4ClO_{3}\ ^{-},XeF_{4},SF_{4} and I3−I_{3}^{-}

  4. Question 4

    Amines. Asked once: 4 Apr 2025 (same type asked 9 times) See all 9 of this type

    101
    The correct order of basicity for the following molecules is:

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  5. Question 5

    Coordination Compounds. Asked once: 24 Jan 2026 S2 (same type asked 9 times) See all 9 of this type

    32
    The wavelengths of light absorbed by the following complexes are in the order: (I) [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +}; (II) [Co(H2O)6]3+\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{3 +}; (III) [Co(CN)6]3−\left\lbrack Co(CN)_{6} \right\rbrack^{3 -}; (IV) [Co(NH3)5(H2O)]3+\left\lbrack Co\left( NH_{3} \right)_{5}\left( H_{2}O \right) \right\rbrack^{3 +}; (V) [CoF6]3−\left\lbrack CoF_{6} \right\rbrack^{3 -}

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