creativityschool creative corner1 | Page 80

Twist your brain

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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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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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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4. Which of the following is used in pencils?

a.Graphite

b.Silicon

cCharcoal

d.Phosphorous

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5. Which of the following metals forms an amalgam with other metals?

a.Tin

b.Mercury

c.Lead

d.Zinc

6. Bromine is a

a.Black solid

b.Red liquid

c.Colourless gas

d.Highly inflammable gas

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7. The hardest substance available on earth is

a.Gold

b.Iron

c.Diamond

d.Platinum

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8. The variety of coal in which the deposit contains recognisable traces of the original plant material is

a.Bitumen

b.Anthracite

c.Lignite

d.Peat

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