question_answer

   (i) Draw a neat and labelled diagram of the apparatus used to separate components of blue-black ink. Name the process and state the principle involved. (ii) Identify the physical and chemical changes from the following. (a) Burning of magnesium in air. (b) Tarnishing of silver spoon. (c) Sublimation of iodine. (d) Electrolysis of water.

Answer:

                  (i) Name of the process Paper chromatography.  Principle of paper chromatography Different components of a mixture move with different speeds in a solvent, so they separate at different heights. Here blue ink and black ink rise with the help of solvent at different speeds to form two spots at different heights. (ii) (a) Chemical                 (b) Chemical (c) Physical                          (d) Chemical