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51 . Bromine is a
A. red liquid
B. colourless gas
C. black solid
D. highly inflammable gas

52 . The variety of coal in which the deposit contains recognisable traces of the original plant material is
A. anthracite B. peat
C. lignite D. bitumen

53 . The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
A. Helium B. Xenon
C. Argon D. Krypton

54 . The average salinity of sea water is
A. 2% B. 2.5%
C. 3% D. 3.5%

55 . Heavy water is
A. PH7
B. deuterium oxide
rain water
D. tritium oxide