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p-Block Elements Test - 6

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p-Block Elements Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In the reaction B2O3 + C + Cl2 → A + CO, A is

    Solution

    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
    1 / -0

    When Al is added to KOH solution,

    Solution

    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
    1 / -0

    Which of the following is electron deficient?

    Solution

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

     

  • Question 4
    1 / -0

    The structure of which of the following is similar to that of graphite?

    Solution

    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
    1 / -0

    'Aluminal' used in bombs is a mixture of

    Solution

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

     

  • Question 6
    1 / -0

    On hydrolysis with 3 molecules of water, SiF4 gives

    Solution

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

     

  • Question 7
    1 / -0

    Name the type of structure of silicate in which one oxygen atom of [SiO4]4- is shared.

    Solution

    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
    1 / -0

    The geometry of metaborate ion is

    Solution

    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
    1 / -0

    Which of the following products will be obtained when diborane is hydrolysed?

    Solution

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

    B2H6 + 6H2O → 2H3BO3 + 6H2

     

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