An example of a negative catalyst is: MCQ with Answer and Explanation

Question

Share Report Error

An example of a negative catalyst is:

A. Fe in Haber process

B. Alcohol in chloroform

C. V₂O₅ in Contact process

D. MnO₂ in decomposition of KClO₃

Answer: Option B

Solution (By JKSSB Mock Tests)

Ethanol is added to chloroform to inhibit its oxidation to phosgene (COCl₂) – a negative catalyst. Others are positive catalysts that speed up reactions.

This question belongs to: Science chemistry

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1

In the reaction: 2PbO + C → 2Pb + CO₂, which substance is oxidized?

A. Pb

B. C

C. CO₂

D. PbO

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Oxidation is the gain of oxygen or loss of electrons. Here, Carbon (C) gains oxygen to form Carbon dioxide (CO₂), so Carbon is oxidized. Lead oxide (PbO) loses oxygen to form Lead (Pb), so PbO is reduced. This is a classic redox reaction where both processes occur simultaneously.

This question belongs to: Science chemistry

Question #2

Assertion (A): Sodium chloride conducts electricity in its molten state. Reason (R): In the molten state, the ions are free to move and carry charge.

A. Both A and R are true and R is the correct explanation of A.

B. A is false but R is true.

C. A is true but R is false.

D. Both A and R are true but R is NOT the correct explanation of A.

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Sodium chloride is an ionic compound. In the solid state, its Na+ and Cl- ions are held tightly in a crystal lattice and cannot move, so it doesn't conduct. When melted, the lattice breaks down, and the ions become mobile. These free-moving ions carry the electric current, making it a good conductor.

This question belongs to: Science chemistry

Question #3

Permanent hardness of water is caused by:

A. Chlorides and sulfates of Ca and Mg

B. Bicarbonates of Ca and Mg

C. Sodium chloride

D. Potassium sulfate

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Permanent hardness is due to CaCl₂, CaSO₄, MgCl₂, MgSO₄. These do not precipitate on boiling. Temporary hardness (bicarbonates) is removed by boiling. Both can be removed by ion exchange or washing soda.

This question belongs to: Science chemistry

Explore All chemistry MCQs