Q. Tetraethyl Lead (TEL) is added to petrol to -
1) Prevent freezing
2) Increase boiling point
3) Increase flash point
4) Increase anti-knocking rating
Q. A chemical reaction that takes place with the evolution of heat is called a/an -
1) Reversible reaction
2) Endothermic reaction
3) Thermal reaction
4) Exothermic reaction
Q. The gas used for the artificial ripening of green fruit is -
1) Ethylene
2) Ethane
3) Carbon dioxide
4) Acetylene
Q. The process in which a solid substance, on being heated, changes directly into the gaseous form is known as -
1) Dissociation
2) Dissolution
3) Sublimation
4) Evaporation
Q. The purest form of water is -
1) Rain water
2) Heavy water
3) Tap water
4) Distilled water
Q. The reagent that bleaches the color of a fabric is -
1) Sodium chloride
2) Sulphur dioxide
3) Carbon dioxide
4) Sulphur trioxide
Q. Emeralds are made up of -
1) Carbon
2) Silica
3) Beryllium
4) Gold
Q. Hypo, used in photography, is chemically -
1) Silver bromide
2) Sodium thiosulphate
3) Sodium phosphate
4) Silver nitrate
Q. Which of the following substances is least prone to catch and spread fire?
1) Nylon
2) Terycot
3) Cotton
4) Polyester
Q. What is another name of RDX?
1) cyanohydrin
2) dextran
3) cyclonite
4) dynamite
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