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12th Standard English Medium Chemistry Subject p - Block Elements - I Book Back 1 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. An aqueous solution of borax is________.

    (a)

    neutral

    (b)

    acidic

    (c)

    basic

    (d)

    amphoteric

  2. Which among the following is not a borane?

    (a)

    B2H6

    (b)

    B3H6

    (c)

    B4H10

    (d)

    none of these

  3. In diborane, the number of electrons that accounts for banana bonds is ________.

    (a)

    six

    (b)

    two

    (c)

    four

    (d)

    three

  4. Carbon atoms in fullerene with formula C60 have _______hybridisation.

    (a)

    sp3 hybridised

    (b)

    sp hybridised

    (c)

    sp2 hybridised

    (d)

    partially sp2 and partially sp3 hybridised

  5. The basic structural unit of silicates is _______.

    (a)

    \(\left( SiO_{ 3 } \right) ^{ 2- }\)

    (b)

    \(\left( SiO_{ 4 } \right) ^{ 2- }\)

    (c)

    \(\left( Sio \right) ^{ - }\)

    (d)

    \(\left( SiO_{ 4 } \right) ^{ 4- }\)

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