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Q.

Choose the correct option for the following given statements.

I. The pH of 1M NaOH is 13.

II. pH + pOH = 14.

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a

Statement I is true, Statement II is true and is a correct explanation of the phenomena described in I.

b

Statement I is true; Statement II is false.

c

Statement I is false; Statement II is true.

d

Statement I is false; Statement II is false.

answer is C.

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Detailed Solution

concept - NaOH is a strong base. So, we can directly find the pOH.
The pH is a scale that defines whether a substance is acidic in nature or basic in nature.
pH scale ranges from 1-14. pH 7 means the solution is neutral, pH less than 7 means the solution is acidic and pH more than 7 means the solution is basic.
The formula to calculate pH or pOH of a solution is-

pH = -log [H +]

or

pOH = -log OH −

Now, [OH-] = 1 M (Given)
Therefore,

pOH = - log (1) = 0 pH + pOH = 14 pH = 14 .

Thus, statement I is False as pH is not 13 but statement II is True as the expression

pH + pOH = 14

, is correct.
Hence, the correct answer is 3.

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