Question 1

Consider the following substances: I. Ethanol II. Nitroglycerine III. Urea Coal gasification technology can be used in the production of how many of them?

Accepted Answer

Answer: Only two.

Question 2

What is the common characteristic of the chemical substances generally known as CL-20, HMX and LLM-105, which are sometimes talked about in media?

Accepted Answer

Answer: These are explosives in military weapons.

Question 3

Consider the following statements:

Statement I: Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries.

Statement II: Activated carbon exhibits a large surface area and a strong potential for adsorbing heavy metals.

Statement III: Activated carbon can be easily synthesized from environmental wastes with high carbon content.

Which one of the following is correct in respect of the above statements?

Accepted Answer

Answer: Both Statement II and Statement III are correct and both of them explain Statement I.

Question 4

Artificial way of causing rainfall to reduce air pollution makes use of

Accepted Answer

Answer: silver iodide and potassium iodide.

UPSC CSE 2025 Chemistry Previous Year Questions