1
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

The number of radial nodes in $4 s$ and $3 p$ orbitals respectively is

A

2 and 0

B

3 and 1

C

1 and 0

D

2 and 1

2
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

The activation energy for a reaction is $9.0 \mathrm{kcal} / \mathrm{mol}$. The increase in the rate constant when the temperature is increased from 298 K to 308 K is

A

$10 \%$

B

$100 \%$

C

$50 \%$

D

$64 \%$

3
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

6.35 g of copper (Atomic mass $=635 \mathrm{u}$ ) is deposited at the cathode from a $\mathrm{Cu}^{2+}$ solution using a certain quantity of electric charge.

The volume of oxygen gas liberated at STP from water electrolysis using the same quantity of electric charge is

A

5.6 L

B

11.2 L

C

1.12 L

D

2.8 L

4
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

When $\mathrm{H}_2 \mathrm{O}_2$ is added to a solution of acidified sodium dichromate, a deep blue colour is observed due to the formation of a peroxo complex. This change signifies that

A

dichromate ion is oxidised.

B

hydrogen peroxide is reduced.

C

oxidation state of Cr remains same.

D

hydrogen peroxide acts as an oxidising agent.

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