CHEMISTRY CLASS 9 SAI
(a) Identify two non-metals from the following elements : i.e. Carbon, Sodium, Chlorine, Neon, Platinum.
(b) Name the appropriate methods to separate nitrogen from air.
(c) Identify dispersed phase and dispersion medium in foam and rubber.

Illustrate with an example that evaporation cause cooling

.Rahul’s mother mixed oil and water in kitchen by mistake. Rahul told her that he can separate the mixture. Name the technique used by Rahul and explain how he will do .

 Draw the diagram and write the principle of this technique.(a) Demonstrate with an activity that gases are highly compressible in nature.

(b) Giver reasons for the following :
 (i) A gas exerts pressure on the walls of the container.
 (ii) A gas fills the vessel in which it is kept
MCQ'S

.The presence of starch can be shown in which food material and using which reagent :
(a) apple juice and Iodine solution  (b) potato extract and safranin (c) apple juice and safranin (d) potato extract and Iodine solution.


A student added two drops of conc hydrochloric acid to adulterated dal in test tube A. Another student added a little sample to conc. hydrochloric acid in test tube B. They would observe.
 (a) appearance of pink colour in any test A (b) no change of colour in any test tube (c) appearance of pink colour in test tube B (d) appearance of pink colour in test tubes A and B


When a magnet is brought near iron sulphide taken in a watch glass ?
 (a) Particles of iron move towards the magnet. (b) Particles of iron sulphide move towards the magnet. (c) Particles of sulphur move towards the magnet. (d) No effect on Iron sulphide.


Students were asked to study the reaction between barium chloride and sodium sulphate. Four different generalisations are made
                     . Procedure                                                                              Observations
 (i) Mixed powder of barium chloride and sodium sulphate The colour of mixture changes to yellow (ii) Mixed solutions of barium chloride and sodium sulphate Thick white precipitate is formed
 (iii) Added solution of barium chloride to sodium sulphate powder Solution becomes turbid
(iv) Added solution of barium chloride to sodium sulphate solution No change is observed
 Choose the correct one :
(a) (i) (b) (ii) (c) (iii) (d) (iv)


In an experiment to determine the boiling point of water, mention two important precautions to be taken.