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21 . Water is a good solvent of ionic salts because
A. it has a high dipole moment
B. it has a high specific heat
it has no colour
D. it has a high boiling point

22 . Which of the following is not an isotope of hydrogen?
A. Tritium B. Yttrium
C. Deuterium D. Protium

23 . The main constituents of pearls are
A. calcium oxide and ammonium chloride
B. aragonite and conchiolin
C. calcium carbonate and magnesium carbonate
ammonium sulphate and sodium carbonate

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

25 . Which of the following is the lightest metal?
A. Mercury B. Lithium
C. Lead D. Silver