Define:

(a) Isomerism

(b) Ores

Name the following:

(a) The property by which carbon links with itself to form a long chain.

(b) The saturated hydrocarbons having general formula C_nH_2n-2.

Complete and balance the following chemical equations:

(a) H₂C = CH₂ + Cl₂ ⟶

(b) C₂H₆ + O₂ [excess] ⟶

(c) CH₄ + O₂ [excess] ⟶

State the following:

(a) A compound formed when excess ammonia gas reacts with chlorine.

(b) A substance added to water, to manufacture sulphuric acid in Contact process.