9.2 Nitric Acid — Chemistry STD 10 — Question

How are the following metallic oxides reduced? Write equations:
Iron (ll) oxide

In order to obtain 1 tonne of aluminium the following inputs are required. 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite
♦ when bauxite is treated with sodium hydroxide solution, what happens to
(i) the aluminium oxide
(ii) the iron (III) oxide

What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of: Duralumin

Amongst the elements P (atomic number 14), Q (atomic number 6) and R (atomic number 15), which elements have similar chemical properties and why?

What will you observe, when hydrogen chlorides mixed with ammonia?

on which factors does purification of metals depend?

How ammonia occurs in nature?

Give reason why:
In the electroplating of an article with silver, the electrolyte sodium argento-cynide solution is preferred over silver nitrate solution.