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Question

B2H6 reacts with O2 and H2O respectvely to form:

A
H3BO3
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B
B2O3
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C
HBO2
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D
B
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Solution

The correct option is B B2O3

Diborane catches fire spontaneously upon exposure to air. When diborane (B2H6) reacts with oxygen (or air) burns spontaneously to produce a large amount of heat. Thus, the reaction is exothermic. The reaction which takes place is:

B2H6+3O2B2O3+3H2O
ΔH=1976 KJmol1

Diborane react with water to form boric acid.
B2H6+6H2O2H3BO3+6H2

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