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 ) ?

1. A. pH 1 < pH 2 < pH 3 < pH 4
2. B. pH 1 > pH 2 > pH 3 > pH 4
3. C. pH 1 < pH 2 < pH 3 pH 4
4. D. pH 1 > pH 2 pH 3 > pH 4

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