1
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.

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

How long should water be electrolysed using 50 A current to release enough $\mathrm{H}_2$ gas to completely reduce 8.0 g of CuO ?

$\left(\mathrm{CuO}+\mathrm{H}_2 \longrightarrow \mathrm{Cu}+\mathrm{H}_2 \mathrm{O}\right.$; Atomic mass of $\mathrm{Cu}=635 \mathrm{u}$ )

A

1600 s

B

1930 s

C

2415 s

D

1280 s

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

$$ \text { Match List-I with List-II. } $$

List I
(Mixture)
List II
(Distinguishing test)
A. Ethanal, propanone I. Brady's reagent
B. Benzaldehyde, acetophenone II. Tollen's reagent
C. Phenol, aniline III. Neutral $\mathrm{FeCl}_3$
D. Cyclohexene, cyclohexane IV. Baeyer's reagent

Choose the correct match from the options given below

A

A-I, B-II, C-III, D-IV

B

A-II, B-I, C-IV, D-III

C

A-III, B-I, C-II, D-IV

D

A-II, B-IV, C-I, D-III

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

How many moles of $\mathrm{KMnO}_4$ are required to oxidise 1 mole of oxalic acid in acidic medium?

A

0.5 mol

B

0.25 mol

C

0.4 mol

D

0.1 mol

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