1.

Brass gets discoloured in air because of the presence of which of the following gases in air?
A. Oxygen B. Hydrogen sulphide
C. Carbon dioxide D. Nitrogen
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
2.

Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous B. Bromine
C. Chlorine D. Helium
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
3.

Chlorophyll is a naturally occurring chelate compound in which central metal is
A. copper B. magnesium
C. iron D. calcium
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
4.

Which of the following is used in pencils?
A. Graphite B. Silicon
C. Charcoal D. Phosphorous
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
5.

Which of the following metals forms an amalgam with other metals?
A. Tin B. Mercury
C. Lead D. Zinc
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.