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Chemistry Test 30

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Chemistry Test 30
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  • Question 1
    4 / -1

    Which one of the following molecules is expected to exhibit diamagnetic behaviour?

    Solution

    N2 → Diamagnetic 
    O2 → Paramagnetic 
    S2 → Paramagnetic 
    B2 → Paramagnetic
    Hence, options A is correct.

  • Question 2
    4 / -1

    Consider an endothermic reaction, X → Y with the activation energies Eb and Effor the backward and forward reactions, respectively. In general

    Solution

    ΔH = Ef - Eb 
    For ΔH = Positive, Eb < Ef. 
    Hence, option A is correct.

  • Question 3
    4 / -1

    Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

    Solution

    Metallic property increases down the group and decreases across a period when moved from left to right. 
    Hence, option A is correct.

  • Question 4
    4 / -1

    The coordination number and the oxidiation state of the element ‘E’ in the complex [E(en)2(C2O4)]NO2 (where (en) is ethylene diamine) are, respectively

    Solution

    We know that en is neutral and C2O4 has 2 negative charge. Outside the complex, we have NO2 which has 1 negative charge. Overall the complex is neutral. Hence the total positive charge which is only due to the central metal is 3 and that is the oxidation state of the central metal.

    both en and C2O4 are bidentate ligands. Therefore, the total coordination number is 6.

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