Question

1. The most reactive metal is a)Iron b)Gold c) Potassium d) Zinc 2. What happens when aluminium metal is placed in the freshly prepared solution of sodium hydroxide ? What does a "POP" sound indicates , when a burning matchstick is brought near the mouth of the test tube?

Answer 1

the most reactive metal is potassium.
when aluminium metal is placed in freshly prepared solution of sodium hydroxide solution, no reaction will take place as aluminium is less reactive than sodium and cannot displace sodium from its compound .
POP sound indicates the presence of hydrogen gas. 

Answer 2

1.The most reactive metal is potassium (K) 2.No reaction takes place as aluminum is less reactive than sodium so it cannot replace it The pop sound indicates the presence of hydrogen gas