1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Half-life of a first order reaction is 20 seconds and initial concentration of reactant is 0.2 M . The concentration of reactant left after 80 seconds is

A
0.1 M
B
0.05 M
C
0.0125 M
D
0.2 M
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

$$ \text { In the given graph, } \mathrm{E}_{\mathrm{a}} \text { for the reverse reaction will be } $$

KCET 2025 Chemistry - Chemical Kinetics Question 1 English
A
125 KJ
B
215 KJ
C
90 KJ
D
305 KJ
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

For the reaction $2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.0 \mathrm{molL}^{-1}$ and after 300 min , it is reduced to $1.4 \mathrm{molL}^{-1}$. The rate of production of $\mathrm{NO}_2\left(\mathrm{in} \mathrm{molL}^{-1} \mathrm{~min}^{-1}\right)$ is

A
$2.5 \times 10^{-4}$
B
$4 \times 10^{-4}$
C
$2.5 \times 10^{-3}$
D
$4 \times 10^{-3}$
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Which of the following methods of expressing concentration are unitless?

A

Mole fraction and Mass percent (W/W)

B

Molality and Mole fraction

C

Mass percent (W/W) and Molality

D

Molality and Molarity

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