Q.

When 1 x 10-3 mol of the chloride of an element Y was completely hydrolysed, it was found that the resulting solution required 20 mL of 0.1 M aqueous silver nitrate for complete precipitation of the chloride ion. Element Y could be

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a

Phosphorus

b

Silicon

c

Sulphur

d

Aluminium

answer is D.

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Detailed Solution

YCln+nH2OnHCl+Y(OH)n(n= valency of Y)nHCl+nAgNO3nAgCl=1n=1×10320×0.1×103 Molaity × Volume 1000=Moln=2( others have n>2)

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