1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

For a reaction, $$A+2 B \rightarrow$$ Products, when concentration of $$B$$ alone is increased half-life remains the same. If concentration of $$A$$ alone is doubled, rate remains the same. The unit of rate constant for the reaction is

A
$$\mathrm{s}^{-1}$$
B
$$\mathrm{L} \mathrm{~mol}^{-1} \mathrm{~s}^{-1}$$
C
$$\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$
D
$$\mathrm{atm}^{-1}$$
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

If the rate constant for a first order reaction is $$k$$, the time $$(t)$$ required for the completion of $$99 \%$$ of the reaction is given by

A
$$t=\frac{4.606}{k}$$
B
$$t=\frac{2.303}{k}$$
C
$$t=\frac{0.693}{k}$$
D
$$t=\frac{6.909}{k}$$
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

The rate of a gaseous reaction is given by the expression $$k[A][B]^2$$. If the volume of vessel is reduced to one half of the initial volume, the reaction rate as compared to original rate is

A
$$\frac{1}{16}$$
B
$$\frac{1}{8}$$
C
8
D
16
4
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Higher order $$(>3)$$ reactions are rare due to

A
shifting of equilibrium towards reactants due to elastic collisions
B
loss of active species on collision
C
low probability of simultaneous collision of all reacting species
D
increase in entropy as more molecules are involved
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