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pH of solutions of four sodium salts NaW...

pH of solutions of four sodium salts NaW, NaX, NaX, NaY and NaZ were found to be 7.0, 9.0, 10.0 and 11.0 respectively. If each solution has concentration 0.1 M, the weakest acid is :

A

HW

B

HX

C

HY

D

HZ

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