Question

pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement:

Statement 1: Solution X is more basic than solution Y.

Statement 2: Solution Y is more basic than solution X.

Statement 3: Solution Y has more ${OH}^{-}$ ion concentration than solution X.

Statement 4: Solution X has more ${OH}^{-}$ ion concentration than solution Y.

Statement 5: Solution Y has more $H^{+}$ ion concentration than solution X.

Statement 6: Solution X has more $H^{+}$ ion concentration than solution Y.

• A. Statement 2, 3 and 5 are correct.
• B. Statement 1, 4 and 6 are correct.
• C. Statement 1,4 and 5 are correct.
• D. Only statement 1 is correct.

Answer 1

The correct option is C Statement 1,4 and 5 are correct.

From the pH value of 7 to 14;

If pH increases, then basic nature increases.

Since, pH of X > pH of Y, then X is more basic than Y. As basic nature increases ${OH}^{-}$ concentration increases. Thus, solution X has more ${OH}^{-}$ ion concentration than Y.

Again, when pH decreases then the acidic nature increases, as solution Y has less pH value so its acidic nature is more hence its hydronium ion concentration will be more than solution X.