Question

What will happen if boron trifluoride is kept in moist air?

• A. It will strongly fumes
• B. It will partially hydrolysed
• C. It will completely hydrolysed
• D. None of these

Answer 1

Answer: (A), (B)

It will strongly fumes
It will partially hydrolysed

In moist air it strongly fumes but it is partially hydrolysed by excess of water.
$4B{F}_3+6H_{2}O\to 3H_3{O}^{+}+3B{F}_4^{-}+B(OH{)}_3$
$B{F}_3$ is a colourless gas.