MCQs of Chemical Kinetics

Chemical Kinetics MCQs

MCQs of Chemical Kinetics

Showing 41 to 50 out of 228 Questions

41.

In which field is chemical kinetics not useful ?

(a)	To slow down corrosion of iron by using barrier protection.
(b)	In using potassium metabisulphate to preserve food for long time and to prevent spoiling of food.
(c)	To prevent spoiling of milk by keeping low temperature.
(d)	To know the proportion to which reactants will be converted into products.

42.

Which of the following statements is correct regarding the rate of a chemical reactions ?

(a)	As the reaction proceeds, rate increases.
(b)	As the reaction proceeds, rate decreases.
(c)	The rate remains constant till the entire reaction is completed.
(d)	The rate increases in some reactions, while it decreases in some other reactions.

43.

Under which of the following conditions, does a match stick burn speedily ? (Hint : Burning of a match stick (or any substance) is proportional to concentration of O₂. )

(a)	In the atmosphere of He
(b)	In Vaccum
(c)	In a gas containing 100 % O₂ gas
(d)	In air ( 21 % O₂)

44.

If equal quantities of fuels are taken, what will be the order of rate of combustion reaction?

(a)	Solid fuel > liquid fuel > gaseous fuel
(b)	Liquid fuel > solid fuel > gaseous fuel
(c)	Gaseous fuel > liquid fuel > solid fuel
(d)	Gaseous fuel = liquid fuel = solid fuel

45.

Which of the following statements is most proper for speedy reactions ?

(a)	Its rate constant is small.
(b)	Its $t_{\frac{1}{2}}$ is very small.
(c)	Its energy barrier is high.
(d)	Frequency of collisions of its reactants is high.

46.

In each example given below, which of two reactions will be speedy ?

(a) ${Na}_{(s)} + I_{2 (s)} \to 2 {NaI}_{(s)}$

(a') ${Na}_{(g)} + I_{2 (g)} \to 2 {NaI}_{(g)}$

(b) $H_{2 (g)} + \frac{1}{2} O_{2 (g)} \to H_{2} O_{(l)}$

(b') $H_{2 (g)} + \frac{1}{2} O_{2 (g)} \overset{catalyst}{\to} H_{2} O_{(l)}$

(c') $C_{(s)} + O_{2 (g)} \overset{1000 ° C}{\to} {CO}_{2 (g)}$

(d) $N_{2 (g)} (10 atm) + 3 H_{2 (g)} (10 atm) \to 2 {NH}_{3 (g)}$

(d') $N_{2 (g)} (2 atm) + 3 H_{2 (g)} (2 atm) \to 2 {NH}_{3 (g)}$

(a)	a, b, c, d
(b)	a', b', c', d'
(c)	a, b', c, d'
(d)	a', b', c', d

47.

Which of the following reactants reacts most speedily under identical conditions ?

(a)	NaCl(molten)
(b)	NaCl_(s)
(c)	NaCl_(g)
(d)	NaCl_(aq)

48.

For the reaction

N_{2 (g)} + 3 H_{2 (g)} ⇋ 2 {NH}_{3 (g)}

, the rate of consumption of H₂ is

2.4 \times 10^{- 2}

. Hence the rate of formation of NH₃ is _____ .

(a)	$1.6 \times 10^{- 2}$
(b)	$3.6 \times 10^{- 2}$
(c)	$9.0 \times 10^{- 3}$
(d)	$4.8 \times 10^{- 2}$

49.

Which of the following statements is correct if in the reaction

2 A + B \to 2 C + 4 D

, the rate of formation of D is

1.6 \times 10^{- 3} {Ms}^{- 1}

(a)	$- \frac{d [A]}{d t} = 6.4 \times 10^{- 3} {Ms}^{- 1}$
(b)	$\frac{d [C]}{d t} = 8.0 \times 10^{- 4} {Ms}^{- 1}$
(c)	$- \frac{d [B]}{d t} = 3.2 \times 10^{- 3} {Ms}^{- 1}$
(d)	$- \frac{1}{2} \frac{d [A]}{d t} = 1.6 \times 10^{- 3} {Ms}^{- 1}$

50.

In the reaction :

${BrO}^{-}_{3 (aq)} + 5 {Br}_{(aq)}^{-} + 6 {H^{+}}_{(aq)} \to 3 {Br}_{2 (l)} + 3 H_{2} O_{(l)}$

rate of consumption of Br^- is

1.5 \times 10^{- 2} {Ms}^{- 1}

. Hence the rate of consumption of H⁺ and the rate of formation of Br₂ are respectively _____ .

(a)	$\frac{6}{5} \times 1.5 \times 10^{- 2}, \frac{3}{5} \times 1.5 \times 10^{- 2}$
(b)	$\frac{5}{6} \times 1.5 \times 10^{- 2}, \frac{5}{3} \times 1.5 \times 10^{- 2}$
(c)	$5 \times 6 \times 1.5 \times 10^{- 2}, 3 \times 6 \times 1.5 \times 10^{- 2}$
(d)	$(5 + 6) \times 1.5 \times 10^{- 2}, (3 + 6) \times 1.5 \times 10^{- 2}$

Showing 41 to 50 out of 228 Questions