Write the reasons of followings:
a) Aluminium is a very good reducing agent.
b) Copper is a better conductor of electricity. But aluminium is widely used for making electric wires.
c) Alumina is dissolved in molten cryolite at the time of electrolysis.

Give reason a) Cryolite is added during the electrolysis of alumina. b) Carbon rod is replaced from time to time while producing aluminium,

Which of the properties of metals is utilized in the following Instances? Aluminium utensils are used for cooking. Copper is used for making vessels. Gold wires are used in ornaments.

a) Write the equation of the chemical reaction taking place at anode and cathode electrolytic refining of aluminium. b) Carbon monoxide cannot be used as reducing agent to extract aluminium from alumina. Why? c) Anode replaced from time to time while producing aluminium. Why?

In the electrorefining of impure aluminium, molten AICI_3 is not used as electrolyte because : Its melting point is very high, pure aluminium formed dissolved into molten AlCl_(3) , it sublimes easily and is poor conductor due to covalent in nature, both 1 and 2

Appropriate material to be used in the construction of resistance boxes out of the following is.....(a)Copper (b)Iron (c)Manganin (d)Aluminium

The symbols of some metals are given below. Pb, Fe, Sn, Na, Au a) Which metal is produced by using electricity as reducing agent? b) Which metal exist in the free state? c) Which compounds of these metals are more stable?