Consider the following reactions : `2NO_(2)(g) rarr 2NO(g) + O_(2)(g)`
In the figure below, identify the curves X, Y and Z associated with the three species in the reaction

Options

A. `X = NO, Y = O_(2), Z = NO_(2)`
B. `X = O_(2), Y = NO, Z = NO_(2)`
C. `X = NO_(2), Y = NO, Z = O_(2)`
D. `X = O_(2), Y = NO_(2), Z = NO`

Answer

A

Explanation

The concentration of X is increasing hence it is product while concentration of Z decreases therefore it is reactant. The concentration of Y increases less than X that means production of Y is less than X. Hence, Y must be `O_(2)` and X must be NO because 2 mole of `NO_(2)` produces 2 mol of NO and 1 mol of `O_(2)`. Therefore, `X = NO, Y = O_(2)` and `Z = NO_(2)`.