MCQs of Chemical Kinetics

Showing 141 to 150 out of 228 Questions

141.

For a first order reaction,

t_{\frac{1}{2}} = 14

seconds. The times required to reduce the concentration to

\frac{1}{8}

will be _____ .

142.

A first order reaction completes to the extent of 30% in 40 minutes. Its

t_{\frac{1}{2}}

= _____ .

143.

What is the order of reaction :

${}_{86}^{226}{Ra} \to {}_{84}^{222}{Rn} + {}_{2}^{4}{He}$

144.

For a first order reaction, the ratio of the times of 50% completion and 90% completion is _____ .

145.

In a flask of 20 litres, concentration of a reactant decreases from 1 mole to 0.5 mole in 20 minutes. The reaction rate = _____ .

(a)	$1.25 \times 10^{- 3} {Ms}^{- 1}$
(b)	$2 \times 10^{- 3} {Ms}^{- 1}$
(c)	$2.5 \times 10^{- 2} {Ms}^{- 1}$
(d)	Incomplete information (data)

146.

Which of the following relations is not correct for first order reaction ?

147.

The value of the ratio of

t_{\frac{7}{8}} to t_{\frac{1}{2}}

for first order reaction is _____ .

148.

For a first order reaction,

\log [R] \to t

is plotted. If the value of the slope of the line is -0.0335 min^-1, then value of K = _____ .

149.

Which of the following relations is not correct for first order reaction ?

150.

Which of the relations from the following is correct that indicates the time to complete the reaction ?

$50 % \overset{t_{1}}{\to} 75 % \overset{t_{2}}{\to} 87.50 % \overset{t_{3}}{\to} 93.75 %$

Showing 141 to 150 out of 228 Questions