Question

Half life period of a first order reaction, $A$ $\to$ product is $6.93$ hour. What is the value of rate constant ?

• A. $1.596\, h^{-1}$
• B. $0.1\, h^{-1}$
• C. $4.802 \, h^{-1}$
• D. $10 \, h^{-1}$

Answer 1

Answer: (B)

We have the formula for half-life of a first order reaction,

$t_{1 / 2}=\frac{0.693}{k}$

where, $k=$ rate constant

$\therefore 6.93 h =\frac{0.693}{k}$

$\Rightarrow k=\frac{0.693}{6.93 h }$

$k =0.1 h ^{-1}$