Q64 / 200 · NEET 2012 (Screening) · Chemistry

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest $\mathrm{pH}$ value?

  • Correct answer
    A
    $\mathrm{BaCl}_2$
  • B
    $\mathrm{AlCl}_3$
  • C
    $\mathrm{LiCl}$
  • D
    $\mathrm{BeCl}_2$

Solution

$\mathrm{BaCl}_2$ is a salt of strong acid $\mathrm{HCl}$ and strong base $\mathrm{Ba}(\mathrm{OH})_2$. So, its aqueous solution is neutral with $\mathrm{pH} 7$. All other salts give acidic solution due to cationic hydrolysis, so their $\mathrm{pH}$ is less than 7. Thus, $\mathrm{pH}$ value is highest for the solution of $\mathrm{BaCl}_2$.

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

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