The following homogeneous gaseous reactions were experimentally found to be second order overall. 1. 2NO arrow N2 +O2 2. 3O2 arrow 2O3 3. N2O3 arrow NO +NO2 4. H2+I2 arrow 2HI

Question

The following homogeneous gaseous reactions were experimentally found to be second order overall. 1. 2NO arrow N2 +O2 2. 3O2 arrow 2O3 3. N2O3 arrow NO +NO2 4. H2+I2 arrow 2HI  (A) 3 only (B) 1 and 3 (C) 1 and 4 (D) 3 and 4

Tardigrade Admin · Accepted Answer

2NO xrightarrowN2+O2 rate =k[NO]2 Hence, order of reaction is 2. H2+I2 xrightarrow[]2HI rate =k[H2][I2] Hence, order of reaction is (1+1)=2 Therefore, these reaction are most likely to be elementary reaction that occur in one step.

Q. The following homogeneous gaseous reactions were experimentally found to be second order overall.
1. $2 NO \to N_{2} + O_{2}$
2. $3 O_{2} \to 2 O_{3}$
3. $N_{2} O_{3} \to NO + N O_{2}$
4. $H_{2} + I_{2} \to 2 H I$

3 only

1 and 3

1 and 4

3 and 4

1, 2 and 3

$2 NO N_{2} + O_{2}$ rate $= k [NO]^{2}$
Hence, order of reaction is 2. $H_{2} + I_{2} 2 H I < b r / >$ rate $= k [H_{2}] [I_{2}]$
Hence, order of reaction is $(1 + 1) = 2$
Therefore, these reaction are most likely to be elementary reaction that occur in one step.

Q. The following homogeneous gaseous reactions were experimentally found to be second order overall. 1. 2NO→N2​+O2​ 2. 3O2​→2O3​ 3. N2​O3​→NO+NO2​ 4. H2​+I2​→2HI