2.
Given the following assertion 'A'. and the reason 'R' the correct option is
Assertion A: In Bayer's process, high pressure is used to dissolve alumina from bauxite.
Reason R: Pressure increases the boiling point of water.

4.
Match the type of reagent used in floatation in Group 1 with reagent in Group 2.
Group 1 Group 2
P. Collector 1. Pine oil
Q. Regulator 2. Copper sulphate
R. Activator 3. Sodium ethyl xanthate
S. Frother 4. Lime

5.
The process of cementation involves

9.
Match the processes given in Group I with the corresponding metals in Group 2.
Group 1 Group 2
P. Matte smelting 1. Lead
Q. Cyanide leaching 2. Copper
R. Carbothermic reduction 3. Gold
S. Fused salt electrolysis 4. Aluminium

10.
Match the unit processes in Group 1 with the objectives in Group 2.
Group 1 Group 2
P. Leaching 1. Precipitation of metal in aqueous solution
Q. Cementation 2. Selective dissolution of metal
R. Roasting 3. Conversion of mattee to metal
S. Converting 4. Conversion of sulfide to oxide
5. Separation of metal from slag