MCQs of Chemical Kinetics

Chemical Kinetics MCQs

MCQs of Chemical Kinetics

Showing 151 to 160 out of 228 Questions

151.

P and Q are different reactants

t_{\frac{1}{2}}

for p is 5 seconds and

t_{\frac{1}{2}}

for Q is 15 seconds. If initially [p] = 4 [Q ], after what time will the concentration of both reactants be equal ?

(a)	75 seconds
(b)	15 seconds
(c)	150 seconds
(d)	30 seconds

152.

t_{\frac{1}{2}}

is 10 minutes for reaction,

$N_{2} O_{5 (g)} ⇌ 2 {NO}_{2 (g)} + \frac{1}{2} O_{2 (g)}$

If initial quantity of N₂O₅ is 10.0 g. What will be its amount left after 40 minutes ?

(a)	0.625 g
(b)	2.50 g
(c)	1.0 g
(d)	0.25 g

153.

t_{\frac{1}{2}}

is 100 days for 10 g radioactive substance. Hence

t_{\frac{1}{2}}

for 20 g substance will be _____ .

(a)	100 days
(b)	200 days
(c)	10 days
(d)	5 days

154.

t_{\frac{1}{2}}

for

{}^{14}C

= 5730 years. If in green vegetation reactivity of

{}^{14}C

is 30 dpm and a wooden idol shows 5 dpm reactivity of

{}^{14}C

, what is the age of the idol ?

(a)	12,520 years
(b)	11,460 years
(c)	17,190 years
(d)	22,920 years

155.

For first order reaction

K = 10^{- 3} \min^{- 1}

. Its

t_{\frac{2}{3}}

= _____ .

(a)	3300 min
(b)	2200 min
(c)	1500 min
(d)	None of the above

156.

To which order if reaction does the following equation belong

K = \frac{2.303}{t} \log \frac{a}{a - x}

(a)	Zero
(b)	First
(c)	x order
(d)	Third

157.

t_{\frac{1}{2}}

for

{}^{14}C

is 5760 years. The time required to convert 200 g into 25 g is _____ .

(a)	17280 years
(b)	800 years
(c)	11520 years
(d)	720 years

158.

t_{\frac{1}{2}}

for a radioactive element in N years, the time required for its complete decay is _____ .

(a)	$\frac{1}{2} \sqrt{N}$ years
(b)	$\frac{1}{2} N^{2}$ years
(c)	2N years
(d)	Infinite years

159.

For a first order reaction, if 40 minutes are required to decrease the concentration of reactant from 6 moles to 3 moles, what time is required in such reaction to decrease 12 moles of reactant to 6 moles ?

(a)	20 minutes
(b)	40 minutes
(c)	80 minutes
(d)	160 minutes

160.

For a first order reaction, initial concentration 0.8 M decreases to 0.1 M in 60 minutes. What is half life period

t_{\frac{1}{2}}

(a)	20 minutes
(b)	30 minutes
(c)	40 minutes
(d)	15 minutes

Showing 151 to 160 out of 228 Questions