Q31 / 180 · KCET 2015 · Chemistry

The aqueous solution of following salt will have the lowest \( \mathrm{pH} \) :

  • A
    \( \mathrm{NaClO}_{3} \)
  • B
    N aCl O
  • C
    \( \mathrm{NaClO}_{2} \)
  • Correct answer
    D
    \( \mathrm{NaClO}_{4} \)

Solution

The pH of the aqueous solution of the following salts depend on corresponding acid. $\mathrm{NaClO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}$ $\mathrm{NaClO}_{4}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{4}$ $\mathrm{NaClO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{3}$ $\mathrm{NaClO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{2}$ $\mathrm{HClO}_{4}$ is the strongest acid, therefore, its salt solution will have the lowest pH value.

Hence, the correct answer is option: 'D'.

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