Gypsum is______?
A. CaSO4
B. CaSO4.1/2H2O
C. CaSO4,2H2O
D. CaSO4.3H2O
Submitted by :- Jamil Ahmed
mnsoomro
In melting of iron, which of the following reactions takes place in Blast Furnace at 4°C- 6°C________?
A. CaO+ SiO2——> CaSiO3
B. 2FeS+3O2——–> 2Fe+ SO2
C. FeSiO3———> FeSiO3
D. Fe2O3+ 3CO——–> 2Fe+ 3CO2
Submitted by :- Jamil Ahmed
Parke’s process is used in the extraction of________?
A. Iron
B. Sodium
C. Silver
D. Zinc
Submitted by :- Jamil Ahmed
Which metal is used as a reducing agent in Smelting______?
A. C
B. Zn
C. Al
D. Cu
Submitted by :- Jamil Ahmed
A process used for the Concentration of Ore is________?
A. Roasting
B. Forth flotation
C. Electrolysis
D. Distillation
Submitted by :- Jamil Ahmed
Which Oxide of Manganese is amphoteric?
A. MnO2
B. Mn2O3
C. Mn2O7
D. MnO
Submitted by :- Jamil Ahmed
The purpose of Smelting an ore is to________?
A. Reduce it
B. Oxidize it
C. Obtain an alloy
D. Separate volatile impurities
Submitted by :- Jamil Ahmed
In borax bead test which compound is formed_________?
A. Ortho borate
B. Meta borate
C. Double oxide
D. Tetra borate
Submitted by :- Jamil Ahmed
Percentage of lead in lead pencil is________?
A. Zero
C. 8
B. 2
D. 7
Submitted by :- Jamil Ahmed