1151. Contact process :
A. Yields corrosive of higher focus than chamber process *
B. Yields acid of lower concentration than chamber process
C. Is obsolete
D. Eliminates absorber
1152. Raw material for ” Solvay process” for manufacture of the soda ash are :
A. Salt, limestone and coke or gas *
B. Ammonia,salt and limestone
C. Ammonia, limestone and coke
D. None of the above
1153. Economics of ” Solvay process” depends upon the efficiency of :
A. Carbonating tower
B. Ammonia recovery
C. Alkali recuperation and size of plant *
D. Ammoniation of salt solution
1154. Mercury cells for caustic soda manufacture, compared to diaphragm cells:
A. Require lower initial investment
B. Require more power
C. Produce lower concentration NaOH
D. None of the above *
1155. Gypsum is chemically :
A. Calcium chloride
B. Potassium sulphate
C. Sodium Sulphate
D. Calcium Sulphate *
1156. Glauber’s salt is chemically :
A. Calcium Sulphate
B. Potassium Sulphate
C. Potassium Chlorate
D. None of the above *
1157. Permanent hardness of water is due to the presence of calcium and magnesium :
A. Bi-Carbonates
B. Sulfate and Chloride *
C. Carbonate
D. None of the above
1158. Widely used method for conditioning of boiler feed water is :
A. Cold lime process
B. Coagulation
C. Hot-lime soda process *
D. Sequestration
1159. Hydrazine is largely used :
A. As a starting material for ” Hypo”
B. In photographic industry
C. As rocket fuel *
D. In printing industry
1160. Trinitro-toluene(TNT) IS :
A. Use in glycerine manufacture
B. An explosive *
C. Used in dye manufacture
D. None of the above