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What is the correct relationship between the pHs of isomolar solutions of sodium oxide

(pH1),
sodium

Question

What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium

sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4)

A) pH1pH2=pH3pH4

B) pH1pH2pH3pH4

C) pH1pH2pH3=pH4

D) pH1pH2pH3pH4

Statistics and Probability