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The table given below shows the pH of four solutions.
A salt is formed when sodium hydroxide is added to solution.

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answer is C.

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Detailed Solution

Sodium hydroxide is a strong base its pH value is around 13. So that it will react with a strong acid like HCl whose pH around 2 to 3 to give salt and water. Hence the solution W is an acid with $pH = 2$ .

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