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61 . The element common to all acids is
A. hydrogen B. sulphur
C. carbon D. oxygen

62 . Non stick cooking utensils are coated with
A. PVC B. Teflon
C. polystyrene D. black paint

63 . Monazite is an ore of
A. thorium B. zirconium
C. iron D. titanium

64 . Carbon, diamond and graphite are together called
A. isotopes B. allotropes
C. isomers D. isomorphs

65 . Most soluble in water is
A. sugar
B. camphor
C. sulphur D. common salt