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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
$p{K_a}$ values of two acids $A$ and $B$ are $4$ and $5$. The strengths of these two acids are related as
  • ✓
    Acid $A$ is $10$  times stronger than acids $B$
  • B
    Strength of acid $A$  : strengtha of acid $B = 4:5$
  • C
    The strengths of the two acids can not be compared
  • D
    Acid $B$ is $10 $ times stronger than acid $A$
✓

Answer

Correct option: A.
Acid $A$ is $10$  times stronger than acids $B$
(a) $p{K_a}$ of acid $A = 4$ ; $p{K_a}$ of acid $B = 5$

We know that $p{K_a} = - \log \,\,{K_a}$

Acid $A $ ${K_a} = {10^{ - 4}}$

Acid $B$  ${K_a} = {10^{ - 5}}$

Hence $A$  is ten times stronger than that of $ B.$

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