An element which never exhibits positive oxidations state in any of its compounds is:
- (A) Oxygen
- (B) Fluorine
- (C) Carbon
- (D) Chlorine
- (B) Fluorine
Brass is an alloy of:
- (A) Copper and Tin
- (B) Tin and Silver
- (C) Copper and Zinc
- (D) Aluminum and Zinc
- (C) Copper and Zinc
Brass gets discolored in air due to presence of _______ gas in air.
- (A) Oxygen
- (B) Nitrogen
- (C) Hydrogen Sulphide
- (D) Carbon dioxide
- (C) Hydrogen Sulphide
An alloy used in making heating elements for electric heating devices is:
- (A) Solder
- (B) Alloy steel
- (C) Nichrome
- (D) German silver
- (C) Nichrome
Which is used for removing air bubbles from glass during its manufacture?
- (A) Soda ash
- (B) Arsenic oxide
- (C) Feldspar
- (D) Potassium carbonate
- (B) Arsenic oxide
Solder is an alloy of:
- (A) Tin and Zinc
- (B) Zinc and Lead
- (C) Tin and Lead
- (D) Zinc and Copper
- (C) Tin and Lead
Which variety of glass is heat resistance?
- (A) Flint glass
- (B) Soft glass
- (C) Pyrex glass
- (D) Hard glass
- (C) Pyrex glass
Bronze is an alloy of:
- (A) Copper and Tin
- (B) Copper and Zinc
- (C) Aluminum and Tin
- (D) Zinc and Aluminum
- (A) Copper and Tin
Which of the following ores does not contain iron?
- (A) Magnetite
- (B) Cassiterite
- (C) Hematite
- (D) Limonite
- (B) Cassiterite
German silver is an alloy of:
- (A) Zinc, copper and silver
- (B) Zinc, copper and nickel
- (C) Copper, nickel and silver
- (D) Iron, gold and copper
- (B) Zinc, copper and nickel
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