162 JUNIOR GRADE SCIENCE 



133. What class of substance is produced by substituting the hydrogen 

 of an acid by a metal ? Give the general properties of these products with 

 special reference to the behaviour of their solutions on litmus. 



134. Distinguish between simple and chemical solutions. Illustrate your 

 answer by contrasting the action of water with that of hydrochloric acid 

 on washing soda. Give other examples from your own experiments of the 

 two kinds of solution. 



