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Welcome to the largest collection of MCQs on the Internet. Access and Discuss these Multiple choice questions for various competitive Exams and Interviews.
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
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Answer: (b).Hydrogen sulphide

2. Which of the following is a non metal that remains liquid at room temperature?
a. Phosphorous
b. Bromine
c. Chlorine
d. Helium
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Answer: (b).Bromine

3. Chlorophyll is a naturally occurring chelate compound in which central metal is
a. copper
b. magnesium
c. iron
d. calcium
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Answer: (b).magnesium

4. Which of the following is used in pencils?
a. Graphite
b. Silicon
c. Charcoal
d. Phosphorous
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Answer: (a).Graphite

5. Which of the following metals forms an amalgam with other metals?
a. Tin
b. Mercury
c. Lead
d. Zinc
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Answer: (b).Mercury

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