Chemical Bonding — Chemistry STD 10 — Question

(a) Why do the molecules of oxygen have a double covalent bond in between their atoms?
(b) Why do the molecules of nitrogen have a triple covalent bond between their atoms?

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

Give the chemical equation for :

The laboratory preparation of methane from sodium acetate.

(a) What do you understand by the term ionic compound?
(b) Name two ionic compounds, stating clearly the charge on each of the participating ion.

Dilute nitric acid is generally considered to be a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?

State your observation when :
Dilute hydrochloric acid is added to sodium thisulphate

Give at least one example in case to show structure of isomers of single bond compound ?

Define the term : Cation and anion

What volume of oxygen is required to burn completely 90 dm³ of butane under similar conditions of temperature and pressure?
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O