A. 200-300
B. 700-850
C. 2000-2200
D. 4000-4500
Related Mcqs:
- Reaction of calcium carbide with water produces a gas, which is used_________________?
A. As an illuminant
B. For metal cutting/welding
C. Both A. & B.
D. Neither A. nor B. - Main product in calcium carbide-water reaction is___________________?
A. Ca(OH)2
B. C2H2
C. CO2
D. CaCO3 - Commercial production of calcium carbide requires limestone and __________________ as raw materials?
A. Coke
B. Sand
C. Soda ash
D. Fuel oil - Coke used for the production of calcium carbide should have____________________?
A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All A , B. and C. - Silicon carbide is a/an_______________?
A. Adhesive
B. Abrasive
C. Type of glass
D. Brittle material - Finely ground calcium aluminate & silicate is a/an ____________________?
A. Cermet
B. Cement
C. Abrasive
D. Explosive - Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of_____________________?
A. Calcium sulphate
B. Sodium chloride
C. Sodium sulphate
D. Magnesium chloride - Magnesium and calcium ______________ cause temporary hardness of water ?
A. Carbonates
B. Bicarbonates
C. Phosphates
D. Sulphates - Main constituents of Portland cement are calcium aluminate and__________________?
A. Gypsum
B. Silicates
C. Sodium silicate
D. Carbonates - Permanent hardness of water is due to the presence of calcium & magnesium __________________?
A. Bi-carbonates
B. Sulphates & chlorides
C. Carbonate
D. None of these
