Select the correct answers from A, B, C, D & E for each statements given below:-
A. Chalk   B. Oxygen    C. Silicon     D. Bromine     E. Nitrous Oxide

1. An element present in the earth's crust, atmosphere & human body.
2. The chemical name for dinitrogen oxide [N₂O]
3. A compound containing carbon, oxygen & calcium.
4. A metalloid.
5. A non-metal which exists in the liquid state.

Select the correct answer from the choice in bracket:

1. The least reactive material. [magnesium/silver/copper]
2. The positively charged particle of an atom. [electron/proton/neutron]
3. The formula of caustic soda. [KOH/Ca(OH)₂, NaOH]
4. The ideal method to separate iodine & KCl. [sublimation/evaporation/distilliation]
5. A homogeneous mixture. [brass/dust in air/chalk & water]

Match the ideal method of separation of components in a mixture in List I with the appropriate process in List II.

1. Sand from a mixture of sand and water: A. Separating funnel
2. Kerosene from a mixture of kerosene and water: B. Sublimation
3. Alcohol from a mixture of methyl alcohol and water: C. Filtration
4. Napthalene from a mixture of naphthalene and lead chloride: D. Distillation
5. Pure water from impure water: E. Fractional distillation

If fractional distillation is carried out using a liquid-liquid mixture,one liquid will remain in the flask & the other will be collected from the receiver. Give reasons.

Name the following:

1. The non-sublimate solid from a mixture of iodine & potassium nitrate.
2. The heavier liquid component from mercury & water.
3. The lower boiling point component from methyl alcohol & water.
4. The compound containing one atom of sulphur & two atoms of oxygen.
5. An acid whose formula is H₂CO₃