Choose the correct answer from the options given – If the molecular formula of an organic compound is C₁₀H₁₈ it is –

(i) Alkene
(ii) Alkane
(iii) Alkyne
(iv) Not a hydrocarbon

State which of the following is a common characteristic of a covalent compound.

1. High melting point
2. Consists of molecules
3. Always soluble in water
4. Conducts electricity when it is in the molten state.

Anhydrous iron (III) chloride is prepared by:

1. direct combination
2. simple displacement
3. decomposition
4. neutralization

Identify the substance underlined, in each of the following cases:

(i) Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.

(ii) The electrolyte used for electroplating an article with silver.

(iii) The particles present in a liquid such as kerosene, that is a non electrolyte.

(iv) An organic compound containing -- COOH functional group.

(v) A solid formed by reaction of two gases, one of which is acidic and the other basic in nature.