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 & Explanation
Answer: Option B
Explanation:
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2.
Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous B. Bromine
C. Chlorine D. Helium
Answer & Explanation
Answer: Option B
Explanation:
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3.
Chlorophyll is a naturally occurring chelate compound in which central metal is
A. copper B. magnesium
C. iron D. calcium
Answer & Explanation
Answer: Option B
Explanation:
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4.
Which of the following is used in pencils?
A. Graphite B. Silicon
C. Charcoal D. Phosphorous
Answer & Explanation
Answer: Option A
Explanation:
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5.
Which of the following metals forms an amalgam with other metals?
A. Tin B. Mercury
C. Lead D. Zinc
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question.