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V PUBLICATION-THE p - BLOCK ELEMENTS-QUESTION BANK
- Pyrosilicates are the silicates in which two tetrahedral units are lin...
02:50
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- A l^(3+)' is not isoelectronic with (1)Ne (2)Na^+ (3)F^- (4)Ca^2+
02:33
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- Which one of the following elements has the highest melting point? (1)...
02:07
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- Orthoboric acid, H3BO3 is a
01:33
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- The hybridisation of boron in 'B F3' and 'BF4' respectively is sp^2, s...
01:50
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- Amorphous form of silica is : tridynite, cristobalite, fumed silica, ...
01:02
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- In silicon dioxide : each siliçon atom is surrunded by four oxygen ato...
01:58
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- Carborundum is
01:34
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- Which of the following statement about boric acid is false. : It acts ...
02:37
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- Which of the following statement about boric acid is false. : It acts ...
02:37
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- Boron trioxide can be reduced with........to get boron Carbon Hydroge...
01:45
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- When boron burns in air it forms:
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- Which compound among the following is an antiseptic? BCl3' H3 BO3' B...
02:09
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- The boron compound which is formed whena solution of borax is acidifie...
01:53
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- Which of the following shows a tendency of dimerisation:?BCl3 BF3 BB...
04:10
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- Which of the following is untrue regarding BF3 ? It is a Lewis acid , ...
02:43
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- Hardest compound of boron is
01:08
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- Which of the following is an acid anhydride.
01:54
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- Producer gas is a mixture of
01:59
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- Which is supposed to be the purest form of carbon? Fullerence Charcoa...
01:43
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