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S and P Block Elements Test - 6

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S and P Block Elements Test - 6
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  • Question 1
    1 / -0

    BCl3 does not exist as dimmer but BH3 exist as dimmer (B2H6) because -

    Solution

    Large-sized chlorine atoms do not fit in between the small boron atoms whereas small-sized hydrogen atoms get fitted in between boron atoms. Due to this reason, BH3 exists but BCl3 does not.

  • Question 2
    1 / -0

    Oxygen is denser than air so it is collected over–

    Solution

    Oxygen is denser than air so it is collected over H2O.

  • Question 3
    1 / -0

    Oxygen molecule exhibits–

    Solution

    Due to presence of unpaired electron it is paramagnetic.

  • Question 4
    1 / -0

    Oxide of a non-metal possesses the following characteristics– 
    (i) It is both a proton donor and an acceptor.
    (ii) It is a poor conductor of electricity in its pure form. 
    (iii) It reacts readily with basic and acidic oxides.
    (iv) It oxidises Fe at its boiling point.
    This oxide is

    Solution

    Water is both a proton donor and an acceptor. It is a poor conductor of electricity in its pure form. It reacts readily with basic and acidic oxides and it oxidises Fe at its boiling point.

  • Question 5
    1 / -0

    Oxygen has + 2 oxidation state in the compound –

    Solution

    F2O = 2(–1) + x = 0 
    x = + 2

  • Question 6
    1 / -0

    Boron reacts with nitric acid to form -

    Solution

    B + 3HNO3→ H3 BO3 
    Boric acid 
    Boron remains unaffected by Non oxidising acids.

  • Question 7
    1 / -0

    In the electrolysis of method of boron extraction the cathode is made of -

    Solution

    Electrolysis of fused B2O3 + MgO + MgF temp. = 1373 K. 
    anode = carbon & cathode = iron rod

  • Question 8
    1 / -0

    B4C is also known as -

    Solution

    B4C = Boron carbide

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