Chromium is obtained by reducing concentrated chromite ore with :
1. Red hot coke
2. Gaseous hydrogen
3. Aluminium powder
4. Carbon monoxide
Which is not correctly matched:
(1) spieglesian : Mn+Fe+C
(2) Dow's sea water process :
(3) parke's process :Ag
(4) liquation spelter(Impure Zn
Incorrect match is :
(a) Purification of Al :Baeyer's method
(b) polling :Reduction of
(C) (chromite ore) : NaOH/N
(d) Ag: Mac Arthur cyanideprocess
Aluminium metal is purified by:
(1) Hoope's process
(2) Hall's process
(3) Serpeck's process
(4) Baeyer's process
Poling process is used for:
(1) The removal of from Cu
(2) The removal of from Al
(3) The removal of from Fe
(4) All of these
AgCl on fusion with sodium carbonate, gives:
1.
2.
3.
4.
Ore of Y would be:
(a) Siderite
(b) Cinnabar
(c) Malachite
(d) Hornsilver
Leaching of Ag2S is carried out by heating it with a dilute solution of:
1. NaCN only
2. HCl
3. NaOH
4. NaCN in presence of O2
Leaching is commercially carried out for in the concentration of:
(1) Galena
(2) Argentite
(3) Copper pyrites
(4) tin stone
NaCN is sometimes added in the froth flotation process as depressant when ZnS and PbS minerals are expected because:
1. is precipitated while no effect on ZnS
2. ZnS forms soluble complex while PbS forms froth
3. PbS forms soluble complex while ZnS forms froth
4. NaCN is never added in froth floatation process