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On hydrolysis, NCl(3) gives NH3 and HOCl...

On hydrolysis, `NCl_(3)` gives `NH_3` and HOCl while `PCl_3` gives `H_3PO_3` and HCl - explain.

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The acidity of a molecule depends on bond polarity of central atom and hydrogen. Greater the polarity, higher will be the acidity. The polarity of bond depends on the electronegativity of the central atom. Since, S is more electronegative then p, `H_2S` is more acidic than `PH_3`
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