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p-Block Elements Test - 11
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p-Block Elements Test - 11

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  • Question 1/10
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    The acidic hydride of nitrogen is

    Solutions

    HN3 is hydrazoic acid.

     

  • Question 2/10
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    Which of the following is the correct statement?

    Solutions

    NH3 is a better electron donor than PH3 because the lone pair of electron occupies sp3 orbital formed from the more compact 2s and 2p orbitals as compared to 3s and 3p orbitals of phosphorous in PH3.

     

  • Question 3/10
    1 / -0

    Which of the following statements regarding the study of oxides of nitrogen is/are correct?

    (i) Except N2O5, all oxides of nitrogenare endothermic as a large amount of energy is required to dissociate the stable molecules of oxygen and nitrogen.
    (ii) Due to small electronegativity difference, N-O bond can be easily broken. Therefore, oxides of nitrogen are good reducing agents.
    (iii) N2O3 is stable at only higher temperature.
    (iv) All oxides of nitrogen are acidic in nature, except N2O and NO.

    Solutions

    (ii) Due to small electronegativity difference, N-O bond is easily breakable. Therefore, oxides of nitrogen are said to be better oxidising agents. Hence, (ii) is wrong.
    (iii) N2O3 is stable at only lower temperature. Hence, (iii) is wrong.
    N2O5 is a stable oxide of nitrogen.
    N2O and NO are neutral oxides.
    Hence, statements (i) and (iv) are correct.

     

  • Question 4/10
    1 / -0

    Which of the following statements is correct for the oxides of nitrogen?

    Solutions

     

  • Question 5/10
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    Consider the following chemical reaction:

    The compounds 'X' and 'Y' in the given reaction respectively are:

    Solutions

     

  • Question 6/10
    1 / -0

    The most stable allotropic form of phosphorus, which has graphite like structure and is good conductor of electricity, is

    Solutions

    Black phosphorus is very much like graphite with both being black and flaky. It is a conductor of electricity and has puckered sheets of linked atoms.

     

  • Question 7/10
    1 / -0

    The pair of products formed during the reaction of yellow phosphorous with aqueous potash solution is

    Solutions

     

  • Question 8/10
    1 / -0

    Statement (I) - The order of densities of the various allotropes of phosphorous is: Black phosphorous > red phosphorous > white phosphorous.
    Statement (II) - The density of various allotropes of phosphorous depends upon tendency of polymerization.

    Which of the following options is correct?

    Solutions

    As the tendency of polymerization increases, the compactness also increases. White phosphorous occurs as discrete molecules, red phosphorous is a linear chain polymer while black phosphorous has a layered structure like graphite.

     

  • Question 9/10
    1 / -0

    The expected products and the nature of the reaction when phosphine gas is mixed with Cl2 gas respectively are

    Solutions

    PH3 is highly poisonous as it explodes with traces of oxidizing agent like HNO3, Cl2 and Br2 vapours.
    PH3 + 3Cl2 → PCl3 + 3HCl; ΔH = -ve

     

  • Question 10/10
    1 / -0

    Three reactions involving H2PO4- are given below:

    In which of the above reactions does H2PO4- act as an acid?

    Solutions

    In the reaction (ii), H2PO4- behaves as a proton donor and hence, it is an acid according to the Arrhenius as well as Bronsted concept.

     

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