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p-Block Elements Test - 6
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p-Block Elements Test - 6

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  • Question 1/10
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    In the reaction B2O3 + C + Cl2 → A + CO, A is

    Solutions

    Boron reacts with halogens to give the corresponding trihalides. Boron trichloride is, however, produced industrially by direct chlorination of boron oxide and carbon at 500°C.
    B2O3 + 3C + 3Cl2 → 2BCl3 + 3CO

     

  • Question 2/10
    1 / -0

    When Al is added to KOH solution,

    Solutions

    Aluminium dissolves in mineral acids as well as alkalis to produce hydrogen gas.

    2Al (s) + 2KOH (aq) + 6H2O → 2Na+[Al(OH)4]- (aq) + 3H2 (g)

     

  • Question 3/10
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    Which of the following is electron deficient?

    Solutions

    BH3 is electron deficient and dimerizes by banana bonding and exists as B2H6.

     

  • Question 4/10
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    The structure of which of the following is similar to that of graphite?

    Solutions

    Boron nitride and carbon exhibit similarity in their crystal structure. Boron nitride can be synthesised in hexagonal (as in graphite) and cubic (as in diamond) forms.

     

  • Question 5/10
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    'Aluminal' used in bombs is a mixture of

    Solutions

    A mixture of aluminium and Al(NO3)3 is used as an explosive in bombs.

     

  • Question 6/10
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    On hydrolysis with 3 molecules of water, SiF4 gives

    Solutions

    On hydrolysis with 3 molecules of water, SiF4 gives H2SiF6 and H2SiO3.
    3SiF4 + 3H2O → H2SiO3 + 2H2SiF6

     

  • Question 7/10
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    Name the type of structure of silicate in which one oxygen atom of [SiO4]4- is shared.

    Solutions

    When two SiO44- units are linked together, they form the pyrosilicategroup, Si2O76-. For example, thortveitite, Sc2Si2O7, is a pyrosilicate. In it, one oxygen atom of [SiO4]4- is shared.

     

  • Question 8/10
    1 / -0

    The geometry of metaborate ion is

    Solutions

    Metaborates, such as LiBO2, contain chains of trigonal BO3 structural units, each sharing two oxygen atoms with adjacent units, whereas NaBO2 and KBO2 contain the cyclic [B3O6]2- ion. Hence, the geometry of metaborates is trigonal planar.

     

  • Question 9/10
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    The compound borazine, also referred to as inorganic benzene, is

    Solutions

    The structure of borazine is similar to benzene.

     

  • Question 10/10
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    Which of the following products will be obtained when diborane is hydrolysed?

    Solutions

    When diborane is hydrolysed, it forms orthoboric acid and hydrogen.

    B2H6 + 6H2O → 2H3BO3 + 6H2

     

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