KCET 2021 | Chemical Kinetics Question 15 | Chemistry

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

$$\mathrm{s}^{-1}$$

$$\mathrm{L} \mathrm{~mol}^{-1} \mathrm{~s}^{-1}$$

$$\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$

$$\mathrm{atm}^{-1}$$

KCET 2021

MCQ (Single Correct Answer)

-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

$$t=\frac{4.606}{k}$$

$$t=\frac{2.303}{k}$$

$$t=\frac{0.693}{k}$$

$$t=\frac{6.909}{k}$$

KCET 2021

MCQ (Single Correct Answer)

-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

$$\frac{1}{16}$$

$$\frac{1}{8}$$

KCET 2021

MCQ (Single Correct Answer)

-0

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

shifting of equilibrium towards reactants due to elastic collisions

loss of active species on collision

low probability of simultaneous collision of all reacting species

increase in entropy as more molecules are involved

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