1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

For a given half cell, $\mathrm{Al}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Al}$ on increasing of aluminium ion, the electrode potential will

A
Decrease
B
No change
C
First increase then decrease
D
Increase
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Match the following select the correct option for the quantity of electricity, in $\mathrm{Cmol}^{-1}$ required to deposit various metals at cathode

$$ \begin{array}{|l|l|l|l|} \hline & \text { List - I } & & \text { List- II } \\ \hline \text { a } & \mathrm{Ag}^{+} & \text {i } & 386000 \mathrm{Cmol}^{-1} \\ \hline \text { b } & \mathrm{Mg}^{2+} & \text { ii } & 289500 \mathrm{Cmol}^{-1} \\ \hline \text { c } & \mathrm{Al}^{3+} & \text { iii } & 96500 \mathrm{Cmol}^{-1} \\ \hline \text { d } & \mathrm{Ti}^{4+} & \text { iv } & 193000 \mathrm{Cmol}^{-1} \\ \hline \end{array} $$
A
a-ii,b-i,c-iv,d-iii
B
$a-i i i, b-i v, c-i i, d-i$
C
$a-i v, b-i i i, c-i, d-i i$
D
a-i,b-ii,c-iii,d-iv
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Catalysts are used to increase the rate of a chemical reaction. Because it

A

Increases the activation energy of the reaction

B

Decreases the activation energy of the reaction

C

Brings about improper orientation of reactant molecules

D

Increases the potential energy barrier

4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Half-life of a first order reaction is 20 seconds and initial concentration of reactant is 0.2 M . The concentration of reactant left after 80 seconds is

A
0.1 M
B
0.05 M
C
0.0125 M
D
0.2 M
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