1
KCET 2024
MCQ (Single Correct Answer)
+1
-0

For the reaction, $A \rightleftharpoons B, E_a=50 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\Delta H=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}$. When a catalyst is added $E_a$ decreases by $10 \mathrm{~kJ} \mathrm{~mol}^{-1}$. What is the $E_a$ for the backward reaction in the presence of catalyst?

A
$60 \mathrm{~kJ} \mathrm{~mol}^{-1}$
B
$40 \mathrm{~kJ} \mathrm{~mol}^{-1}$
C
$70 \mathrm{~kJ} \mathrm{~mol}^{-1}$
D
$20 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2
KCET 2024
MCQ (Single Correct Answer)
+1
-0

For the reaction, $\mathrm{PCl}_5 \longrightarrow \mathrm{PCl}_3+\mathrm{Cl}_2$, rate and rate constant are $1.02 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ and $3.4 \times 10^{-5} \mathrm{~s}^{-1}$ respectively at a given instant. The molar concentration of $\mathrm{PCl}_5$ at that instant is

A
  $8.0 \mathrm{~mol} \mathrm{~L}^{-1}$
B
$3.0 \mathrm{~mol} \mathrm{~L}^{-1}$
C
$0.2 \mathrm{~mol} \mathrm{~L}^{-1}$
D
$2.0 \mathrm{~mol} \mathrm{~L}^{-1}$
3
KCET 2024
MCQ (Single Correct Answer)
+1
-0

Which one of the following does not represent Arrhenius equation?

A
$\log k=\log A-\frac{E_a}{2.303 R T}$
B
$k=A e^{\frac{-E_a}{R T}}$
C
$\ln k=-\frac{E_a}{R T}+\ln A$
D
$k=A e^{\frac{E_a}{R T}}$
4
KCET 2023
MCQ (Single Correct Answer)
+1
-0

In which one of the following reactions, rate constant has the unit $$\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ ?

A
Acid catalysed hydrolysis of $$\mathrm{CH}_3 \mathrm{COOCH}_3$$
B
$$\mathrm{CHCl}_3+\mathrm{Cl}_2 \longrightarrow \mathrm{CCl}_4+\mathrm{HCl}$$
C
$$2 \mathrm{NO}(g)+\mathrm{O}_2(g) \longrightarrow 2 \mathrm{NO}_2(g)$$
D
Decomposition of HI on the surface of gold
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