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${PK}_{a}$ values of two acids A and B are 4 and 5. The strengths of these two acids are related as

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The strength of the two acids cannot be compared

Acid B is 10 times stronger than Acid A.

Strength of the acid A. Strength of acid B=4:5

Acid A is 10 times stronger than Acids B

answer is A.

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Detailed Solution

For acid A ${PK}_{a} = 4 \Rightarrow Ka = 10^{- 4}$

For acid B ${PK}_{a} = 5 \Rightarrow Ka = 10^{- 5}$

$A^{Ka} = x \times B^{Ka}$

$10^{- 4} = x \times 10^{- 5}$ $∴ x = 10$

Acid A is 10 times stronger than acid B.

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