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What will happen if borontrifluoride is kept in moist air?

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What will happen if borontrifluoride is kept in moist air?
A. it will strongly fume
B. It will partially hydrolyse.
C. It will completely hydrolyse
D. None of these
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Correct Answer - A
In moist air it strongly fume, but it is partially hydrolysed by excess of water.
`4BF_(3)+6H_(2)Oto3H_(3)O^(+)+3BF_(4)^(-)+B(OH)_(3)`
`BF_(3)` is a colourless gas.
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