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AIIMS 2001
Exam
AIIMS
Year
2001
Subject
Chemistry
Chapter
Ionic Equilibrium

AIIMS 2001 · Chemistry · Ionic Equilibrium

The aqueous solution of which of the following salt will have the...

The aqueous solution of which of the following salt will have the lowest pH\mathrm{pH} ?

Options

  1. ANaClO3\mathrm{NaClO}_3
  2. BNaClO\mathrm{NaClO}
  3. CNaClO4\mathrm{NaClO}_4
  4. DNaClO2\mathrm{NaClO}_2

Correct answer

C. NaClO4\mathrm{NaClO}_4

Step-by-step solution

NaClO4→Na++ClO4−NaClO3→Na++ClO3−NaClO2→Na++ClO2−NaClO→Na++ClO−\begin{aligned}& \mathrm{NaClO}_{4} \rightarrow \mathrm{Na}^{+}+\mathrm{ClO}_{4}^{-} \\ & \mathrm{NaClO}_{3} \rightarrow \mathrm{Na}^{+}+\mathrm{ClO}_{3}^{-} \\ & \mathrm{NaClO}_{2} \rightarrow \mathrm{Na}^{+}+\mathrm{ClO}_{2}^{-} \\ & \mathrm{NaClO} \rightarrow \mathrm{Na}^{+}+\mathrm{ClO}^{-} \end{aligned}In aqueous solution, these compounds decompose into ions. ClO4−\mathrm{ClO}_4^{-}will most easily abstract proton from water molecules. So it will be most acidic.
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