Match the following-
Column I | Column II |
A. Sphalerite | p. FeCO3 |
B. Malachite | q. ZnCO3 |
C. Calamite | r. Na3AlF6 |
D. Cryolite | s. CuCO3.Cu(OH)2 |
E. Siderite | t. ZnS |
A - r; B - p; C - t; D - q; E - s
A - t; B - s; C - q; D - p; E - r
A - t; B - r; C - q; D - p; E - s
A - t; B - s; C - q; D - r; E - p
In the metallurgy of zinc; the reducing agent employed in reducing the zinc oxide to crude zinc metal in the last stage is
Al
Li
Coke
Water gas
According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature?
Al2O3
Cu2O
MgO
ZnO
The elements present in the core of earth are collectively known as
lithophiles
nucleophiles
chalcophiles
siderophiles
The froth-floatation process is based upon:
he difference in the specific gravity of ore and gangue particles
the magnetic properties of gangue and ore
preferential wetting of gangue particles by oil
preferential wetting of ore particles by oil
A certain metal will liberate hydrogen from dilute acids. It will react with water to form hydrogen only when the metal is heated and the water is in the form of steam. The metal is probably:
iron
potassium
copper
mercury
Name of the alloy of aluminium which is used in aeroplane is :
duralumin
bell metal
aluminium bronze
alumina