Materials Used in the Preparation of Substances like Soap, Glass, Ink, Paper, Cement, Paints, Safety Matches and Gun-Powder NDA Questions

NDA Chemistry

Materials Used in the Preparation of Substances like Soap, Glass, Ink, Paper, Cement, Paints, Safety Matches and Gun-Powder MCQ Questions


7.
Transparent soaps are manufactured by:
A.
Adding excess of sodium chloride to soap
B.
Mixing soap with sand and pumice powder
C.
Dissolving soap in ethanol and then evaporating the excess solvent
D.
Boiling soap with sodium silicate
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ANSWER :
C. Dissolving soap in ethanol and then evaporating the excess solvent
8.
Laundry (washing) soaps generally contain fillers such as:
A.
Borax and calcium carbonate only
B.
Sodium rosinate and sodium silicate
C.
Starch and glycerol only
D.
Titanium dioxide
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ANSWER :
B. Sodium rosinate and sodium silicate
9.
Glass is best classified as a/an:
A.
Crystalline solid
B.
Colloidal sol
C.
Super-cooled (amorphous) liquid
D.
Ionic crystal
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ANSWER :
C. Super-cooled (amorphous) liquid
10.
Ordinary soda-lime glass used for windows and bottles is manufactured mainly by fusing:
A.
Sand, cerium oxide and sodium carbonate
B.
Sand (silica), sodium carbonate and limestone
C.
Sand, lead oxide and potassium oxide
D.
Sand, boric oxide and aluminium oxide
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ANSWER :
B. Sand (silica), sodium carbonate and limestone
11.
Borosilicate (Pyrex) glass, used for laboratory apparatus, contains boric oxide along with silica and:
A.
Potassium chlorate
B.
Cerium oxide only
C.
A small proportion of aluminium oxide and sodium oxide
D.
A large proportion of lead oxide
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ANSWER :
C. A small proportion of aluminium oxide and sodium oxide
12.
The main reason Pyrex glass is preferred for laboratory glassware is its:
A.
Bright colour
B.
High solubility in water
C.
High electrical conductivity
D.
Low coefficient of thermal expansion
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ANSWER :
D. Low coefficient of thermal expansion