Entrance Guru:Chemistry Model questions and answers part 2

                                                              Chemistry

1) When a colloidal solution is observed under an ultra microscope,we can see :

   a) light scattered by colloidal particles 

   b) size of colloidal particles

   c) shape of the colloidal particles

   d) relative size of colloidal particles

2) Gold number is minimum in case of :

   a) Gelatin

   b) Egg albumin

   c) Gum arabic

   d) Starch

3) which of the following catalysts is used for preparing toluene by reacting benzene with methyl chloride?

   a) Ni

   b) Anhydrous AlCl 3 

   c) Pd

   d) Pt

4) In the hydrogenation of oil the catalyst used is 

   a) Iron

   b) Platinum 

   c) Nickel

   d) Molybdenum

5) Mist is an example of colloidal system of :

   a) Liquid dispersed in gas 

   b) Gas dispersed in gas

   c) Solid dispersed in gas 

   d) Solid dispersed in liquid 

                                                      Answers  

1) a) When a colloidal solution is observed under an ultra microscope ,we can see light      scattered by colloidal particles

2) a) Gold number is minimum in the case of gelatin

3) b) benzene is treated with CH3Cl in the presence of catalyst AlCl3 gives toluene

4) c) In hydrogenation of oils,Ni is used as a catalyst

5) a) Mist is a colloidal system of liquid dispersed in gas