1
MHT CET 2023 11th May Morning Shift
+1
-0

What is half life time of a first order reaction if initial conc. of reactant is $$0.01 \mathrm{~mol} \mathrm{~L}^{-1}$$ and rate of reaction is $$0.00352 \mathrm{~mol} \mathrm{~L}^{-1}$$ minute $$^{-1}$$ ?

A
1.969 minute
B
7.75 minute
C
16.69 minute
D
19.69 minute
2
MHT CET 2023 10th May Evening Shift
+1
-0

Find the average rate of formation of $$\mathrm{NO}_{2(\mathrm{~g})}$$, in following reaction.

\begin{aligned} & 2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\ & {\left[-\frac{\Delta\left[\mathrm{N}_2 \mathrm{O}_5\right]}{\Delta \mathrm{t}}\right]=x \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}} \end{aligned}

A
$$x \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
B
$$\frac{x}{2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
C
$$2 x \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
D
$$4 x \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$
3
MHT CET 2023 10th May Evening Shift
+1
-0

Calculate the rate constant for the first order reaction, $$\mathrm{A} \rightarrow \mathrm{B}$$ if the rate of reaction is $$5.4 \times 10^{-6} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}$$ and $$[\mathrm{A}]=0.3 \mathrm{M}$$.

A
$$1.8 \times 10^{-5} \mathrm{~s}^{-1}$$
B
$$1.5 \times 10^{-5} \mathrm{~s}^{-1}$$
C
$$2.1 \times 10^{-5} \mathrm{~s}^{-1}$$
D
$$2.4 \times 10^{-5} \mathrm{~s}^{-1}$$
4
MHT CET 2023 10th May Evening Shift
+1
-0

Time required for $$90 \%$$ completion of a first order reaction is '$$x$$' minute. Calculate the time required to complete $$99.9 \%$$ of the reaction at same temperature.

A
$$x$$ minute
B
$$2 x$$ minute
C
$$3 x$$ minute
D
$$\frac{x}{2}$$ minute
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Medical
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