Compare the acidic strengths of the hydrides in periods and groups.

1.	Compare the acidic strengths of the hydrides in periods and groups.
Answer» Solution :In periods, the ACIDIC strength increases in the order, `CH_4lt NH_3lt H_ 2Olt HF ` Acidic strength of non-metal hydrides increases with increase in the electronegativity of ELEMENTS FORMING the hydrides. Methane almost has no acidic nature. Hydrogen fluoride is a CLEAR proton donor in aqueous solutions. But in groups H-Abond strength is more important factor in detemining the acidity than its polar nature. As the size of A increases down the group, H-A bond strength decreases and the acidic strength increases. EG. Acidic strength order of hydrogen halides is `HF lt HCI lt HBr lt HI`

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