1
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the rate constant of first order reaction in second having half life of 2.5 hours.

A
$$4.3 \times 10^{-5} \mathrm{sec}^{-1}$$
B
$$7.7 \times 10^{-5} \mathrm{sec}^{-1}$$
C
$$6.9 \times 10^{-5} \mathrm{sec}^{-1}$$
D
$$8.4 \times 10^{-5} \mathrm{sec}^{-1}$$
2
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If rate of reaction is given as

$$\frac{1}{3} \frac{\mathrm{d}[\mathrm{x}]}{\mathrm{dt}}=-\frac{1}{2} \frac{\mathrm{d}[\mathrm{y}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{Z}]}{\mathrm{dt}}$$,

the reaction can be represented as

A
$$2 \mathrm{y}+Z \rightarrow 3 \mathrm{x}$$
B
$$2 \mathrm{y} \rightarrow 3 \mathrm{x}+\mathrm{Z}$$
C
$$3 x+2 y \rightarrow Z$$
D
$$3 x \rightarrow 2 y+Z$$
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a first reaction 60% of reactant decomposes in 4.606 min. What is half life of reaction? (k = 0.1989 min$$^{-1}$$)

A
3.48 min
B
2.4 min
C
3.0 min
D
1.74 min
4
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

For the reaction, $$2 \mathrm{~A}+\mathrm{B} \rightarrow 2 \mathrm{C}$$, rate of disappearance of $$\mathrm{A}$$ is $$0.076 \mathrm{~mol} \mathrm{~s}^{-1}$$. What is the rate of disappearance of $$\mathrm{B}$$ ?

A
$$0.076 \mathrm{~mol} \mathrm{~s}^{-1}$$
B
$$0.038 \mathrm{~mol} \mathrm{~s}^{-1}$$
C
$$0.019 \mathrm{~mol} \mathrm{~s}^{-1}$$
D
$$0.095 \mathrm{~mol} \mathrm{~s}^{-1}$$
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