Mole Concept And Stoichiometry — Chemistry STD 10 — Question

(a) What do you understand by the term roasting of ore?
(b) What is the importance of roasting in the extraction of metals?

A researcher measures 10.0 liters of oxygen gas (O₂) at 300 K and 2 atm. The researcher then measures 10.0 liters of nitrogen gas (N₂) under the same conditions.
(i) How do the number of moles of oxygen and nitrogen gases compare?
(ii) Describe the principle from Avogadro's Law that supports this comparison.

Under what conditions does ethane gets converted to acetic acid

Give two reasons to show that the solution of ammonia in water contains hydroxylions.

How are the following conversion brought about? Give equation and condition:
Aqueous barium chloride to barium sulphate.

Explain the following:
Ammonia solution is used in the laboratory to identify metalions.

In order to obtain one tone of aluminium, the following inputs are required:
4 tones 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 (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) The iron (III) oxide?

Define the term : Electrolysis

If 6 liters of hydrogen and 4 liters of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

Write a balanced equation:

Convert ethyne to ethane