1.

What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH_(1)), sodium sulphide (pH_(2)), sodium selenide (pH_(3)) and sodium telluride (pH_(4))

Answer»

`pH_(1) GT pH_(2) = pH_(3) gt pH_(4)`
`pH_(1) LT pH_(2) lt pH_(3) lt pH_(4)`
`pH_(1) lt pH_(2) lt pH_(3) = pH_(4)`
`pH_(1) gt pH_(2) gt pH_(3) gt pH_(4)`

Solution :Order of acidic strength is `H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`
`Na_(2)O` is a salt of `NaOH + H_(2)O` and `H_(2)S` is least acidic AMONG given acids hence pH in this case will be `"MAX"^(m)`.


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