E-PolyLearning

26. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
a. bromine
b. fluorine
c. chlorine
d. sulphur
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Answer: (d).sulphur

27. The element common to all acids is
a. hydrogen
b. carbon
c. sulphur
d. oxygen
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Answer: (a).hydrogen

28. Non stick cooking utensils are coated with
a. Teflon
b. PVC
c. black paint
d. polystyrene
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Answer: (a).Teflon

29. Monazite is an ore of
a. titanium
b. zirconium
c. iron
d. thorium
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Answer: (d).thorium

30. Carbon, diamond and graphite are together called
a. allotropes
b. isomers
c. isomorphs
d. isotopes
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Answer: (a).allotropes

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