Q. Dichloro - dipenyl - trichloro - ethane (DDT) is a -
1) Biochemical pollutant
2) Non-biodegradable pollutant
3) Biodegradable pollutant
4) Non-pollutant
Q. Rusting of Iron is an example of -
1) Decomposition
2) Radioactive decay
3) Oxidation
4) Reduction
Q. Which of the following is an ore of iron?
1) Hematite
2) Alluminium
3) Bauxite
4) Cinnabar
Q. Pure gold is -
1) 14 karat
2) 24 karat
3) 18 karat
4) 22 karat
Q. The most hazardous metal pollutant of automobile exhaust is -
1) Mercury
2) Lead
3) Tin
4) Copper
Q. Benzene is -
1) Gaseous pollutant
2) Liquid pollutant
3) Solid pollutant
4) All of the above
Q. Which acid is used for cleaning gold ornaments?
1) Nitric Acid
2) Boric Acid
3) Sulphuric Acid
4) Oxalic Acid
Q. Which of the following groups of organic compounds are least likely to be used in making perfumes?
1) Alcohols
2) Carboxylic Acids
3) Esters
4) Aldehydes
Q. Which of the following gases are the main contributors to acid rain?
1) Oxygen and carbon monoxide
2) Sulphur dioxide and oxygen
3) Sulphur dioxide and hydrogen sulphide
4) Sulphur dioxide and nitrous oxide
Q. Which of the following properties is different for neutral atoms of two isotopes of the same element?
1) Atomic number
2) Mass
3) Number of electrons
4) General chemical reaction
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