STD 11 -p-Block elements - I — NEET STD 11 Science — Question

Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals

Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.

In the light of the above statements, choose the correct answer from the options given below :

The above reaction is of zero order. Half life of this reaction is $50\,min$. The time taken for the concentration of $A$ to reduce to one-fourth of its initial value is $...........\min$(Nearest integer)

     $n$                $l$                 $m$                  $s$