What is the main raw material in glass?
(A) Copper
(B) Zink
(C) Cadmium
(D) Silica
Water gas is the mixture of
(A) carbon dioxide and hydrogen
(B) carbon monoxide and hydrogen
(C) carbon dioxide and nitrogen
(D) carbon monoxide and nitrogen bear
Impure camphor is purified by
(A) sublimation
(B) fractional crystallization
(C) fractional distillation
(D) steam distillation
Milk is a natural
(A) Solution
(B) Mixture
(C) Suspension
(D) Emulsion
Washing soda is the common name for
(A) Calcium carbonate
(B) Sodium carbonate
(C) Calcium bicarbonate
(D) Sodium bicarbonate
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