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$B F_{3}$ fumes strongly in moist air and partially hydrolysed by excess of $H_{2} O$

$B F_{3}$ is converted in to the adducts $B F_{2} . H_{2} O$ and $B F_{2} .2 H_{2} O$ with small amount of $H_{2} O$ at low temperature.

$H_{3} B O_{3}$ is weak acid but $H B F_{4}$ is very strong acid

$K B F_{4}$ is sparingly soluble in $H_{2} O$

answer is A.

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Detailed Solution

All boran halides except $B F_{3}$ are hydrolysed to boric acid $(H_{3} B O_{3}) .$ Why because $B - F$ bond is very strong

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