Question

10 ASSERTION (A): Refining of petroleum involves fractional distillation,
REASON
(R): Fractional distillation involves repeated evaporation and distillation
11 ASSERTION (A): A mixture of salt and camphor is separated by sublimation
REASON (R): Camphor is sublimable whereas salt is non-sublimable.
12 ASSERTION (A): During a chemical change no new substance is formed.
REASON (R): Burning a candle involves both physical and chemical changes.
THREE MARK QUESTIONS
13 A solution contains 40 g of common salt in 320 g of water.
(a) Calculate the concentration in terms of mass by the mass percentage of the solution.
(b) Identify the solute and the solvent in the tincture of iodine.
(c) Why is the Tyndall effect not seen in a true solution?
14 (a) Draw a well-labelled diagram of the experimental set up used for fractional distillation.
(b) Name the technique used to separate alum from an impure sample.
Why is this technique better than a simple evaporation technique?

Answer 1

Answer:

a draw a well-labelled diagram of the