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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
A salt whose aqueous solution will have a $pH$ of more than $7$ will be :
  • ✓
    $\mathrm{K}_2 \mathrm{CO}_3$
  • B
    $\mathrm{K}_2 \mathrm{SO}_4$
  • C
    $\ce{NaCl}$
  • D
    $\mathrm{NH}_4 \mathrm{Cl}$
✓

Answer

Correct option: A.
$\mathrm{K}_2 \mathrm{CO}_3$
$\mathrm{K}_2 \mathrm{CO}_3$ is formed from a weak acid, carbonic acid $\left(\mathrm{H}_2 \mathrm{CO}_3\right)$, and a strong base, potassium hydroxide $(\mathrm{KOH})$. On hydrolysis, $\mathrm{K}_2 \mathrm{CO}_3$ forms more $\mathrm{OH}^{-}$ions than $\mathrm{H}^{+}$ions.
Thus, it is basic, with a $pH$ more than $7 .$

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