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1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

For an elementary reaction $$2 A+3 B \rightarrow 4 C+D$$ the rate of appearance of $C$ at time '$$T$$' is $$2.8 \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$. Rate of disappearance of $$B$$ at '$$t$$' $t$ will be

A
$$\frac{4}{3}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
B
$$\frac{3}{4}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
C
$$2\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
D
$$\frac{1}{4}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

The rate constant of a reaction is given by $$k=P Z e^{-E_a / R T}$$ under standard notation. In order to speed up the reaction, which of the following factors has to be decreased?

A
Z
B
Both Z and T
C
$$E_a$$
D
T
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

The plot of $$t_{1 / 2} \mathrm{~v} / \mathrm{s}~[R]_0$$ for a reaction is a straight-line parallel to $$X$$-axis. The unit for the rate constant of this reaction is

A
$$\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}$$
B
$$\mathrm{mol~L}^{-1} \mathrm{~s}^{-1}$$
C
$$\mathrm{L} \mathrm{~mol}^{-1} \mathrm{~s}^{1-}$$
D
$$\mathrm{s}^{-1}$$
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Which is a wrong statement?

A
Rate constant $$k=$$ Arrhenius constant $$A$$ : if $$E_a=0$$
B
$$e^{-E_a / R T}$$ gives the fraction of reactant molecules that are activated at the given temperature
C
In $$k v s \frac{1}{T}$$ plot is a straight line
D
presence of catalyst will not alter the value of $$E_a$$
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