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Acids, Bases and Salts — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
A salt whose aqueous solution will have a $pH$ of more than $7$ will be:
  • ✓
    $K_2CO_3$
  • B
    $K_2SO_4$
  • C
    $NaCl$
  • D
    $NH_4Cl$
✓

Answer

Correct option: A.
$K_2CO_3$
$K_2CO_3$ is formed from a weak acid, carbonic acid $(H_2CO_3)$, and a strong base, potassium hydroxide $(KOH)$. On hydrolysis, $K_2CO_3$ forms more $OH^-$ ions than $H^+$ ions. Thus, it is basic, with a $pH$ more than $7$.

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