Which of the following is the lightest metal?
- (A) Silver
- (B) Lead
- (C) Mercury
- (D) Lithium
- (D) Lithium
Temporary hardness of water can be removed by aiding:
- (A) Quick lime
- (B) Soda lime
- (C) Lime water
- (D) Slaked lime
- (D) Slaked lime
Permanent hardness of water can be removed by adding:
- (A) Potassium
- (B) Chlorine
- (C) Washing Soda
- (D) Bleaching Powder
- (C) Washing Soda
Washing Soda is the common name of:
- (A) Calcium carbonate
- (B) Calcium bi-carbonate
- (C) Sodium carbonate
- (D) Sodium bi-carbonate
- (C) Sodium carbonate
What is the chemical formula of sodium carbonate?
- (A) Na2CO1
- (B) Na2CO2
- (C) Na2CO3
- (D) Na2CO4
- (C) Na2CO3
Which of the following is the purest form of carbon?
- (A) Diamond
- (B) Marble
- (C) Bucky ball
- (D) Graphite
- (A) Diamond
Which of the following when taken by pregnant women, is found to be cause of deformed children?
- (A) Glycerol
- (B) Thalidomide
- (C) Xylidine
- (D) Asbestos
- (B) Thalidomide
Which of the following is used in pencils?
- (A) Charcoal
- (B) Silicon
- (C) Phosphorus
- (D) Graphite
- (D) Graphite
Which of the following is best conductor of electricity?
- (A) Copper
- (B) Mica
- (C) Zinc
- (D) Silver
- (D) Silver
Which synthetic fiber is known as artificial Silk?
- (A) Cotton
- (B) Rayon
- (C) Nylon
- (D) Terylene
- (B) Rayon
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