A mixture of 1 mol (CH3)2SiCl2 and 1 mol CH3SiCl3 is completely hydrolysed. The total number of moles of HCl liberated is

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A mixture of 1 mol $(CH X_{3}) X_{2} SiCl X_{2}$ and 1 mol $CH X_{3} SiCl X_{3}$ is completely hydrolysed. The total number of moles of $HCl$ liberated is

Each Si--Cl bond gives one

HCl

on hydrolysis (the Cl is replaced by OH).

(CH X_{3}) X_{2} SiCl X_{2}

has 2 Si--Cl bonds and

CH X_{3} SiCl X_{3}

has 3. The total is

2 + 3 = 5

mol.