Answer: D) The reaction rate will increase by a factor of four.
Explanation:
\(A\rightarrow products\)
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.
given order =2 , thus rate law is:
\(R=[A]^2\) (1)
On cutting the concentration of A to half
\(R'=[\frac{A}{2}]^2\) (2)
Dividing 2 by 1
\(\frac{R'}{R}=\frac{1}{4}\)
\(R'=4R\)
