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Day 279: JEE Mains Chemistry

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

  1. Question 1

    Coordination Compounds. Asked once: 23 Jan 2026 S1 (same type asked 9 times) See all 9 of this type

    34
    Given below are two statements : Statement I: [CoBr4]2−\left\lbrack {CoBr}_{4} \right\rbrack^{2 -} ion will absorb light of lower energy than [CoCl4]2−\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} ion. Statement II : In [CoI4]2−\left\lbrack {CoI}_{4} \right\rbrack^{2 -} ion, the energy separation between the two set of d-orbitals is more than [CoCl4]2−\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} ion. In the light of the above statements, choose the correct answer from the options given below :

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  2. Question 2

    Coordination Compounds. Asked once: 8 Apr 2024 (same type asked 9 times) See all 9 of this type

    49
    Number of complexes with even number of electrons in t2 gt_{2\text{ }g} orbitals is - [Fe(H2O)6]2+,[Co(H2O)6]2+,[Co(H2O)6]3+\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{3 +},
    [Cu(H2O)6]2+,[Cr(H2O)6]2+\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +}

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  3. Question 3

    Coordination Compounds. Asked once: 9 Apr 2024 (same type asked 9 times) See all 9 of this type

    42
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The total number of geometrical isomers shown by [Co(en)2Cl2]+\left\lbrack Co(en)_{2}Cl_{2} \right\rbrack^{+}complex ion is three Reason (R): [Co(en)2Cl2]+\left\lbrack Co(en)_{2}Cl_{2} \right\rbrack^{+}complex ion has an octahedral geometry. In the light of the above statements, choose the most appropriate answer from the options given below:

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 22 Jan 2025 (same type asked 9 times) See all 9 of this type

    47
    In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl . The percentage composition of chlorine in the compound is ____\_\_\_\_ %\%. [Given : molar mass in gmol−1gmol^{- 1} of Ag:108Ag:108, Cl=35.5]Cl = 35.5\rbrack

  5. Question 5

    Coordination Compounds. Asked once: 22 Jan 2025 (same type asked 9 times) See all 9 of this type

    41
    In which of the following complexes the CFSE, Δ0\Delta_{0} will be equal to zero?

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