1.

Account for the following: The acidic strength decreases in the order HCl gt H_2S gt PH_3

Answer»

Solution :Acidic STRENGTH of a hydrogen compound depends UPON the electronegativity difference between hydrogen and the second element. Greater the electronegativity difference, greater the acidic strength. Electronegativity DECREASES in the order
`CL(3.2) GT S (2.44) gt P(2.1)`
Consequently , the acidic strength also decreases in the order
`HCl gt H_2S gt PH_3`


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