Which of the following has the highest value of pH at the same temperature for the same concentration?

H C l

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N a O H

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C a {(O H)}_{2}

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{C H}_{3} C O O H

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Solution

The correct option is A $N a O H$
$N a O H$ is a strong base has pH near $14$ . $C a (O H)_{2}$ is a weak base has pH value lower than $N a O H$ . $H C l$ and $C H_{3} C O O H$ both are acids have pH value less than $7$ .

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