General Knowledge - General Science

Exercise :: General Science - Elements and Metals

56. 

Water is a good solvent of ionic salts because

A. it has a high specific heat
B. it has no colour
C. it has a high dipole moment
D. it has a high boiling point

Answer: Option C

Explanation:

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57. 

Which of the following is not an isotope of hydrogen?

A. Tritium
B. Deuterium
C. Protium
D. Yttrium

Answer: Option D

Explanation:

http://en.wikipedia.org/wiki/Isotopes_of_hydrogen

58. 

The main constituents of pearls are

A. calcium oxide and ammonium chloride
B. calcium carbonate and magnesium carbonate
C. aragonite and conchiolin
D. ammonium sulphate and sodium carbonate

Answer: Option B

Explanation:

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59. 

Amalgams are

A. highly coloured alloys
B. alloys which contain mercury as one of the contents
C. alloys which have great resistance to abrasion
D. alloys which contain carbon

Answer: Option B

Explanation:

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60. 

Which of the following is the lightest metal?

A. Mercury
B. Lithium
C. Lead
D. Silver

Answer: Option B

Explanation:

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