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Chemistry
Which among the following reaction is an example of a zero order reaction?
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Q. Which among the following reaction is an example of a zero order reaction?
MHT CET
MHT CET 2019
A
$\ce{C_{12}H_{22}O_{11(aq)} + H2O\,(l) -> C6H_{12}O_6(aq) + C6H_{12}O6(aq) }$
B
$\ce{2NH3(g) ->[Pt] N2(g) + 3\, H2}$
C
$\ce{2\, H2O2(l) -> 2\, H2O(l) + O2(g)}$
D
$\ce{H2(g) + l2 (g) -> 2 \,HI(g)}$
Solution:
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.
$\ce{2NH_3(g) ->[Pt \text{ catalyst}] N_2(g) +3H_2(g)}$
Rate $=k [NH_3]^{\circ} = k$