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(D) The $pH$ of an aqueous solution of a salt of a strong base and a weak acid depends on the strength of the acid. Stronger the acid,weaker is its co

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$pH_1 > pH_2 > pH_3 > pH_4$

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(D) The $pH$ of an aqueous solution of a salt of a strong base and a weak acid depends on the strength of the acid. Stronger the acid,weaker is its conjugate base,and lower is the $pH$ of its salt solution. The order of acidic strength of the corresponding hydrides is $H_2O Since the acidic strength increases down the group,the basic strength of the conjugate bases $(O^{2-}, S^{2-}, Se^{2-}, Te^{2-})$ decreases in the order $O^{2-} > S^{2-} > Se^{2-} > Te^{2-}$. Therefore,the $pH$ of the isomolar solutions follows the order $pH_1 > pH_2 > pH_3 > pH_4$.

What is the correct relationship between the $pH$s of isomolar solutions of sodium oxide $(pH_1)$,sodium sulphide $(pH_2)$,sodium selenide $(pH_3)$ and sodium telluride $(pH_4)$?

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