Chemistry Page-11

101) In vulcanization, natural rubber is heated with
(A) Carbon
(B) Sulphur
(C) Silicon
(D) Phosphorus

102) Which one of the following does not wet the walls of the glass vessel in which it is kept?
(A) Water
(B) Alcohol
(C) Mercury
(D) None of these

103) Dialysis is used for people with defective kidneys. It involves the process of
(A) Adsorption
(B) Osmosis
(C) Electrophoresis
(D) Diffusion

104) The substance coated on plastic tape-recorder tapes is.
(A) Zinc oxide
(B) Manganese oxide
(C) Iron sulphate
(D) Iron oxide

105) Which form of phosphorus is used in safety matches?
(A) White phosphorus
(B) Yellow phosphorus
(C) Red phosphorus
(D) Black phosphorus

106) Permanent hardness of water can be removed by adding
(A) Potassium permanganate
(B) Chlorine
(C) Bleaching powder
(D) Washing soda

107) The first synthetic fiber made by man was
(A) Rayon
(B) Nylon
(C) Polyester
(D) Terrycoti

108) Gypsum is added to cement clinker to
(A) Increase the tensile strength of cement
(B) Bind the particles of calcium silicate
(C) Decrease the rate of setting of cement
(D) Facilitate the formation of colloidal gel

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