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Day 112: JEE Mains Chemistry

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

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 3 Apr 2025 (same type asked 11 times) See all 11 of this type

    102
    10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is :

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  2. Question 2

    Coordination Compounds. Asked once: 24 Jan 2026 S1 (same type asked 10 times) See all 10 of this type

    34
    Given below are two statements Statements-I : The number of paramagnetic species among [CoF6]3−, [TiF6]3−, V2O5\left\lbrack {CoF}_{6} \right\rbrack^{3 -},\ \left\lbrack {TiF}_{6} \right\rbrack^{3 -},\ V_{2}O_{5} and [Fe(CN)6]3−\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -} is 3 . Statement-II : K4[Fe(CN)6]<K3[Fe(CN)6]<[Fe(H2O)6]SO4⋅H2O<[Fe(H2O)6]Cl3K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack < K_{3}\left\lbrack Fe(CN)_{6} \right\rbrack < \left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{SO}_{4} \cdot H_{2}O < \left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{3} is the correct order in terms of number of unpaired electron(s) in the complexes. In the light of the above statements, choose the correct answer from the options given below.

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  3. Question 3

    Some Basic Concepts of Chemistry. Asked once: 6 Apr 2026 S2 (same type asked 10 times) See all 10 of this type

    26
    Which of the following contain the same number of atoms? (Given : Molar mass in gmol−1gmol^{- 1} of H,He,OH,He,O and S are 1,4,161,4,16 and 32 respectively) (A) 2 g of O2O_{2} gas (B) 4 g of SO2{SO}_{2} gas (C) 1400 mL of O2O_{2} at STP (D) 0.05 L of He at STP (E) 0.0625 mol0.0625\text{ }mol of H2H_{2} gas Choose the correct answer from the options given below :

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  4. Question 4

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 24 Jan 2026 S2 (same type asked 10 times) See all 10 of this type

    46
    0.25 g of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl2{CaCl}_{2} tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is ____\_\_\_\_ %. (Nearest integer) (Given: molar mass in gmol−1H:1,C:12,O:16g{mol}^{- 1}H:1,C:12,O:16 )

  5. Question 5

    Coordination Compounds. Asked once: 4 Apr 2025 (same type asked 10 times) See all 10 of this type

    111
    The correct order of [FeF6]3−,[CoF6]3−,[Ni(CO)4]\left\lbrack FeF_{6} \right\rbrack^{3 -},\left\lbrack CoF_{6} \right\rbrack^{3 -},\left\lbrack Ni(CO)_{4} \right\rbrack and [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} complex species based on the number of unpaired electrons present is :

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