1
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

For the reaction, $$3 \mathrm{~F}+\mathrm{S}_2 \mathrm{O}_8^{2-} \rightarrow \mathrm{I}_3^{-}+2 \mathrm{SO}_4^{2-}$$, at a particular time $$\mathrm{t}, \frac{\mathrm{d}\left[\mathrm{SO}_4^{2-}\right]}{\mathrm{dt}}$$ is $$2.2 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$. What is the value of $$-\frac{\mathrm{d}\left[\mathrm{I}^{-}\right]}{\mathrm{dt}}$$ ?

A
$$1.1 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
B
$$3.3 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
C
$$4.4 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
D
$$6.6 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
2
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

What is the half life of a first order reaction if rate constant is $$4.2 \times 10^{-2}$$ per day?

A
5.0 day
B
16.5 day
C
28.0 day
D
9.0 day
3
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The reaction, $$3 \mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_3^{-}+2 \mathrm{Cl}^{-}$$ occurs in two steps:

i. $$\quad 2 \mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_2^{-}+\mathrm{Cl}^{-}$$

ii. $$\quad \mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_3^{-}+\mathrm{Cl}^{-}$$,

the reaction intermediate is:

A
$$\mathrm{Cl}^{-}$$
B
$$\mathrm{ClO}_2^{-}$$
C
$$\mathrm{ClO}_3^{-}$$
D
$$\mathrm{ClO}^{-}$$
4
MHT CET 2023 9th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Calculate the rate constant of first order reaction if the concentration of the reactant decreases by $$90 \%$$ in 30 minutes.

A
$$7.7 \times 10^{-2}$$ minute $$^{-1}$$
B
$$4.2 \times 10^{-2}$$ minute $$^{-1}$$
C
$$2.1 \times 10^{-2}$$ minute $$^{-1}$$
D
$$3.5 \times 10^{-2}$$ minute $$^{-1}$$
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