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From separate solutions of sodium salts,...

From separate solutions of sodium salts, `NaW`, `NaX`, `NaY` and `NaZ` have `pH 7.0`, `9.0`, `10.0` and `11.0` respectively. When each solution was `0.1 M`, the strongest acid is:

A

HW

B

HX

C

HY

D

HZ

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The correct Answer is:
a
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