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प्रश्न
Give the principles of the hydrolytic method.
उत्तर
In this method, we pour the ore over a sloping, vibrating corrugated table with grooves. A jet of water is allowed to flow over the surface. The denser ore particles settle in the grooves, and the impurities are washed away by water.
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संबंधित प्रश्न
Name the most abundant metal in the earth's crust.
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals are good conductors of electricity.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Sulphide ores : Roasting : : Carbonate ores : _______
