Which among the following reaction is an example of a zero order reaction?

Options

A. `C_(12)H_(22)O_(11)(aq)+H_(2)O(l)toC_(6)H_(12)O_(6)(aq)+C_(6)H_(12)O_(6)(aq)`
B. `2NH_(3)(g)overset(pt)toN_(2)(g)+3H_(2)`
C. `2H_(2)O_(2)(l)to2H_(2)O(l)+O_(2)(g)`
D. `H_(2)(g)+I_(2)(g)to2HI(g)`

Answer

B

Explanation

Decomposition of gaseous ammonia on platinum surface at high temperature and pressure is an example of zero order reaction . It is of first order when concentration of `NH_(3)` is low .
`2NH_(3)(g)overset("Pt catalyst")toN_(2)(g)+3H_(2)(g)`
Rate`=k[NH_(3)]^(@)=k`