Question

A reaction is catalysed by $H^{+}$ ion in the presence of $HA$, rate constant is $2\times {10}^{-3}mi{n}^{-1}$ and in presence of $HB$, rate constant is $1\times {10}^{-3}mi{n}^{-1}$ . $HA$ and $HB$ (both strong acids) have relative strength as:

• A. $0.5$
• B. $0.002$
• C. $0.001$
• D. $2$

Answer 1

The correct option is D $2$

The relative strength is the ratio of the rate constants.
$Relativestrength=\frac{RateconstantofHA}{RateconstantofHB}=\frac{2\times {10}^{-3}mi{n}^{-1}}{1\times {10}^{-3}mi{n}^{-1}}=2.$