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p-Block Elements Test - 13
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p-Block Elements Test - 13
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  • Question 1/8
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    Which of the following is the most acidic?

    Solutions

    Acidic character of group 15 oxides decreases down the group. This is because acidic strength of the oxides decreases with decrease in the electronegativity of the element.
    Hence, among the given options, P2O3 is the most acidic.

     

  • Question 2/8
    1 / -0

    In earlier days of photography, strong ammonia solution was used to dissolve unchanged AgBr. In photographic 'fixing', nowadays, ammonia has been replaced by Na2S2O3 because

    Solutions

    This is the proper reason as ammonia is very harmful and intolerable in a closed space.

     

  • Question 3/8
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    Directions For Questions

    The following question has four choices, out of which ONLY ONE is correct.

    ...view full instructions

    Which of the following statements about SCl4 is not correct?

    Solutions

    Wrong. SCl4 is an unstable liquid.

     

  • Question 4/8
    1 / -0

    The most favourable condition for the manufacture of NH3 is

    Solutions

    Manufacturing of ammonia is done by Haber process. The most favourable condition for Haber process is low temperature and high pressure.

     

  • Question 5/8
    1 / -0

    The oxidation state of nitrogen in dinitrogen oxide is

    Solutions

    Dinitrogen oxide, N2O
    2x + (-2) = 0
    So, x = +1

     

  • Question 6/8
    1 / -0

    A gas X with disagreeable odour reduces silver nitrate solution to give metallic silver and is itself oxidised to Y. Y is a dibasic acid with reducing properties. It is slowly oxidised in air to a tribasic acid Z. Though Z is a tribasic acid, it behaves in aqueous solution mostly as a dibasic acid. When a mixture of X and N2O is subjected to electric spark, Z is obtained.

    The gas X is

    Solutions

    Phosphine is a gas with disagreeable odour of rotten fish. It can reduce silver nitrate solution to metallic silver and is itself oxidised to H3PO3, a dibasic acid with reducing properties.
    6AgNO3 + PH3 + 3H2O → 6Ag + H3PO3 + 6HNO3

     

  • Question 7/8
    1 / -0

    Which of the following statements is incorrect regarding hypophosphorous acid?

    Solutions

    This is wrong. There is only one replaceable hydrogen atom in hypophosphorous acid; so it is a monobasic acid.

     

  • Question 8/8
    1 / -0

    Which of the following is the strongest acid?

    Solutions

    The oxidation state of the central atom in this case is +7, which is the highest of the given options. Hence, it is the strongest acid among all.

     

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