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Ionic Equilibrium — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryIonic Equilibrium1 Mark
MCQ
A weak acid is $0.1%$ ionised in $0.1 M$ solution. Its pH is …………..
  • A
    $2$
  • B
    $3$
  • ✓
    $4$
  • D
    $1$
✓

Answer

Correct option: C.
$4$
$(c)$  $4$
For a monobasic acid $\left[ H ^{+}\right]= c . \alpha$
$=\frac{1}{2} \times 0.001=10^{-4} $
$pH =-\log _{10}\left[10^{-4}\right]=4$

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