CUET · CHEMISTRY · PYQ PAPER 2025

Which of the following is used as a catalyst in contact process?

A finely divided iron
B \(V_{2}O_{5}\)
C \(Cu_{2}Cl_{2}\)
D Ni in presence of \(H_{2}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(V_{2}O_{5}\)

Step-by-step Solution

Detailed explanation

\(V_{2}O_{5}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

\(V_2 O _6\) catalyst is used in the manufacturing of

CUET 2025 Medium
The correct sequence for product formation according to the Collision theory of chemical reaction is
(A) Proper orientation
(B) Molecules collide with threshold energy
(C) Intermediate formation
(D) Formation of products
Choose the correct answer from the options given below:

CUET 2025 Easy
Answer the question on basis of passage given below :
A ketone \([A]\) which undergoes haloform reaction gives compound \([B]\) on reduction. Compound
\([B]\) on heating with sulphuric acid gives compound \([C]\) which forms monozonide \([D]\). The compound [D] on hydrolysis in the presence of zinc dust gives compound [E].
Compound [E] on oxidation gives \(C _2 H _4 O _2\) [F]
The compound \([ B ]\) formed can be prepared from reaction of aq. KOH . with :

CUET 2023 Hard
An inorganic salt taken in a test tube was mixed with freshly prepared ferrous sulphate solution.
Concentrated sulphuric acid was then added along the walls of the test tube.
Predict the formula of the compound formed :

CUET 2023 Hard
Which of the following reactions is used to prepare Haloarenes?

CUET 2025 Hard
Match List - I with List - II.
List – I List – II
(A) Polyvinyl chloride (I) Phenol formaldehyde
(B) Urea-formaldehyde (II) Ethyleneglycol and phthalic acid
(C) Glyptal (III) Vinyl chloride
(D) Bakelite (IV) Urea-formaldehyde

Choose the correct answer from the options given below :

CUET 2023 Easy

Explore more questions on app

From CUET

Match List - I with List - II.
List – I List – II
(A) SN1 reaction (I) vic-dibromide
(B) Bromination of alkenes (II) gem-dibromide
(C) Alkylidene halides (III) Racemisation
(D) Dehydrohalogenation of haloalkanes (IV) Saytzeff rule

Choose the correct answer from the options given below :

CUET 2023 Easy
In a LPP , if the objective function \(Z=a x+b y\) has the same maximum value at two corner points of the feasible region, then the number of points at which \(Z_{\max }\) occurs is:

CUET 2023 Hard
Let \(A\) be a non-singular square matrix of order \(n\) with \(|\operatorname{adj} A|=64\) and \(|A|=4\), then ' \(n\) ' is :

CUET 2023 Hard
If \(\vec{a}, \vec{b}\) and \(\sqrt{3} \vec{a}+\vec{b}\) are unit vectors, then the angle between \(\vec{a}\) and \(\vec{b}\) is:

CUET 2025 Hard
A transformer has 4000 turns in primary and 100 turns in secondary coils. The primary coil in connected to a 240 V and secondary to a bulb of 1.2 \(\Omega\) resistance. The current in the bulb is :

CUET 2023 Easy
What is the product of the following reaction?
\(R-CN \frac{H_2 / Nl}{Na\left(H_{g}\right) / C_2 H_6 OH}\)
The options are:

CUET 2023 Medium

Explore more questions on app

List – I	List – II
(A) Polyvinyl chloride	(I) Phenol formaldehyde
(B) Urea-formaldehyde	(II) Ethyleneglycol and phthalic acid
(C) Glyptal	(III) Vinyl chloride
(D) Bakelite	(IV) Urea-formaldehyde

List – I	List – II
(A) SN1 reaction	(I) vic-dibromide
(B) Bromination of alkenes	(II) gem-dibromide
(C) Alkylidene halides	(III) Racemisation
(D) Dehydrohalogenation of haloalkanes	(IV) Saytzeff rule