Question

In the reaction 2NO (g) + O2 (g) --> 2NO2 (g) . Which species has the highest rate of consumption (decrease)?
O2
NO2
NO
All species have the same rate

Answer 1

answer : option (c) NO

This is based on concept of chemical kinetic

if aA + bB ⇔cC is a chemical reaction,

then, rate of disappearance of A = rate of disappearance of B = rate of appearance of C

⇒- 1/a d[A]/dt = -1/b d[B]/dt = 1/c d[C]/dt

let's come the question.

In reaction, 2NO + O₂ ⇒2NO₂

rate of disappearance of NO = rate of disappearance of O₂ = rate of appearance of NO₂

⇒-1/2 d[NO]/dt = -1/1 d[O₂]/dt = 1/2 d[NO₂]/dt = k (let)

now

⇒d[NO]/dt = -2k

⇒d[O₂]/dt = -k

⇒d[NO₂]/dt = k

here it is clear that NO has the highest rate of disappearance.

therefore, option (c) NO is correct choice.

Answer 2

Answer:

answer : option (c) NO

This is based on concept of chemical kinetic

if aA + bB ⇔cC is a chemical reaction,

then, rate of disappearance of A = rate of disappearance of B = rate of appearance of C

⇒- 1/a d[A]/dt = -1/b d[B]/dt = 1/c d[C]/dt

let's come the question.

In reaction, 2NO + O₂ ⇒2NO₂

rate of disappearance of NO = rate of disappearance of O₂ = rate of appearance of NO₂

⇒-1/2 d[NO]/dt = -1/1 d[O₂]/dt = 1/2 d[NO₂]/dt = k (let)

now

⇒d[NO]/dt = -2k

⇒d[O₂]/dt = -k

⇒d[NO₂]/dt = k

here it is clear that NO has the highest rate of disappearance.

therefore, option (c) NO is correct choice.