pKa values of two acids A and B are 4 and 5. The strengths of these two acids are related as

Options

A. the strengths of the two acid cannot be compared
B. acid B is 10 times stronger than acid A
C. acid A is 10 times stronger than acid B
D. strength of acid A: strength of acid `B= 4 : 5`

Answer

C

Explanation

`pK_(a (A)) = -log K_(a (A)) = 10^(-4)`
`pK_(a (B)) = - log K_(a) (B) = 10^(-5)`
By comparing, `K_(a(A)) = 10K_(a(B))`