To get a solution of $p H = 7$ , which of the following should be reacted with an equal volume of $0.05 M B a {(O H)}_{2}$ ?

0.1 M H C l

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0.1 M N a C l

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0.1 M H C_{2} H_{3} O_{2}

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0.1 M C H_{3} O H

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0.1 M K O H

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Solution

The correct option is A $0.1 M H C l$
To get a solution of $p H = 7$ , $0.1 M H C l$ should be reacted with an equal volume of $0.05 M$ $B a (O H)_{2}$ .
The number of moles of $H C l$ will be twice the number of moles of $B a (O H)_{2}$ .
$B a (O H)_{2} + 2 H C l \to B a C l_{2} + 2 H_{2} O$
$B a C l_{2}$ is a salt of strong acid with strong base. Its solution is neutral with pH $7$ .

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