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Q.
The molecule, which is not hydrolysed by water at $25^{\circ}C$ is
KVPYKVPY 2017The p-Block Elements
Solution:
The moelcule, which is not hydrolysed by water at $25^{\circ} C$ is $SF _{6}$. This is because it is kinetically stabilised, attack at $S$ is impossible due to steric Hindrance and also because of the rigidity of $F-SF$ angles.
The hydrolysed product of other molecules are as follows :
$AlCl _{3}+ H _{2} O \longrightarrow Al ( OH )_{3}+ HCl$
$SiCl _{4}+2 H _{2} O \longrightarrow 4 HCl + SiO _{2}$
$BF _{3}+ H _{2} O \longrightarrow H _{3} BO _{3}+ HBF _{4}$