Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is known to form the largest number of compounds from the following. (Carbon/Sulphur/Phosphorous)

Classify the substances given in Figure into elements and compounds.

Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about $25 \mathrm{K}$ or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.