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The p-Block Elements Test - 3

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The p-Block Elements Test - 3
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  • Question 1
    1 / -0

    Elements having +5 oxidation state is

    Solution

    The maximum oxidation state shown by a p-block element is equal to the total number of valence electrons (i.e., the sum of the s and p-electrons).

    P :[Ne]3s23p3. Total valence electrons =5 so it will show +5 oxidation state. The stability of +5 oxidation state decreases down the group due to inert pair effect.

  • Question 2
    1 / -0

    [Ar]3d104s24p3 is the electronic configuration of

    Solution

    Arsenic is a group 15 element and its atomic no. is 33.

  • Question 3
    1 / -0

    The most common oxidation states of nitrogen are

    Solution

    N shows -3 in NH3, +3 in HNO2 and +5 in HNO3.

  • Question 4
    1 / -0

    In which of the following compound, nitrogen shows the oxidation state of +5?

    Solution

    Oxidation state of O is -2 and H is +1. Let the oxidation state of N is x.
    (+1) +x + 3(-2) = 0
    x = +5

  • Question 5
    1 / -0

    The maximum covalency of nitrogen is

    Solution

    N has maximum covalency of 4 since only four (one s and three p) orbitals are available for bonding. d orbitals are not available for bonding.

  • Question 6
    1 / -0

    Which among the following forms basic oxide?

    Solution

    As we move down the group in periodic table, metallic character increases so Bi is a metal thus its oxide is basic.

  • Question 7
    1 / -0

    Ammonia has a higher boiling point and is less volatile because of

    Solution

    In the solid and liquid states NH3 is associated through intermolecular hydrogen bonding and therefore it has higher boiling point and less volatile compared to other hydrides of group 15.

  • Question 8
    1 / -0

    Which compound is used in the preparation of caprolactam?

    Solution

    NH3 is used in the preparation of caprolactam. Caprolactam is an organic compound with the formula (CH2)5C(O)NH. It is used to make Nylon 6 fibre and plastics.

  • Question 9
    1 / -0

    Which compound is used as the cooling liquid in refrigerators?

    Solution

    Liquid NH3 is used as refrigerant. evaporation of a liquid needs heat energy. when liquid ammonia vapourises, it absorbs large quantities of heat without changing its temperature.

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