question_answer 69)

  What happens when a piece of (a) zinc metal is added to copper sulphate solution? (b) aluminium metal is added to dilute hydrochloric acid? (c) silver metal is added to copper sulphate solution? Also write the balanced chemical equation, if reaction occurs.

Answer:

  (a) Blue colour of (aq)Solution disappears Reason Zinc reacts with a copper sulphate to form colourless zinc sulphte solution and solid copper is deposited fro, as Zn is more reactive than Cu, so, displaces Cu from solution (b) Hydrogen gas is evolved Reason Alumninum reacts with dilute hydrochloric acid to form aluminium chloride and hydrogen gas. (c)No reaction occurs Reason Silver metal is less reactive than copper, therefore, it cannot displace copper from copper sulphate solution.