For the reaction, 2 NO(g)→N2(g)+O2(g) the expression −12d[NO]dt represents

For the reaction, $2 {NO}_{(g)} \to N_{2 (g)} + O_{2 (g)}$ the expression $- \frac{1}{2} \frac{d [NO]}{dt}$ represents

A
The rate of formation of $NO$
B
The average rate of the reaction
C
The instantaneous rate of the reaction
D
All the above

Solution:

The ratio of concentration change to time during very small time period. So that

- \frac{1}{2} \frac{d [NO]}{dt}

represents the instantaneous rate of the reaction.

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