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The p-Block Elements

Short Answer Type

21.

The B–X distance is shorter than what is theoretically expected in BX₃molecules. Why?

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22.

Complete the reaction:

$BF subscript 3 space plus space LiH space rightwards arrow space space$

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23.

Complete the reaction

$NaBH subscript 4 space plus space straight I subscript 2 space space rightwards arrow$

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24.

Present a comparative account of the structures of chlorides of boron and aluminium.

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25.
Why boron compounds such as BF₃ are called electron deficient compounds?

In BF₃ molecules three electrons of Boron and three electrons of fluorine combine to forms the compound. Since boron in its compounds does not have a complete octet (8 electrons).

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26.

Complete the reaction:
$BCl subscript 3 space plus space straight H subscript 2 straight O space space rightwards arrow$

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Multiple Choice Questions

27.

An aqueous solution of borax is

neutral
amphoteric
basic
acidic

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28.

Boric acid is polymeric due to

its acidic nature
the presence of hydrogen bonds
its monobasic nature
its geometry

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29.

The type of hybridisation of boron is diborane is

sp
sp²
sp³
dsp²

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Short Answer Type

30.

Name the purest form of carbon.

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Short Answer Type

25. Why boron compounds such as BF3 are called electron deficient compounds?

Multiple Choice Questions

Short Answer Type

25.
Why boron compounds such as BF₃ are called electron deficient compounds?