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Chemistry of Ores and Metals

13. 

Which of the following statements about the physical properties of metal is NOT correct?

A. all metals are solids except mercury B. Metals are solids under normal conditions except for Mercury. C. gold and silver are not malleable D. most of the metals are ductile

Answer : C. gold and silver are not malleable

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14. 

which among the following is heaviest metal

A. Mercury B. Iron C. nickel D. Copper

Answer : A. Mercury

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15. 

Which is the lightest metal in the periodic table

A. Hydrogen B. Lithium C. Helium D. Sodium

Answer : B. Lithium

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16. 

German silver is the combination of

A. Copper, Nickel and Aluminium B. Copper, Zinc and Nickel C. Chromium, Nickel and Mercury D. Lead,copper and Chromium

Answer : B. Copper, Zinc and Nickel

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17. 

The percentage of gold in 22 carat is

A. 80% B. 91.60% C. 99% D. 100%

Answer : B. 91.60%

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18. 

Why is tungsten used in electric bulbs?

A. It is cheaper than other metals B. It is durable C. It has high melting point D. it makes the bulb glow brighter

Answer : C. It has high melting point

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