Question

Q1.Why should a magnesium ribbon be cleaned with sand paper before burning in air?
Q.2 What is a decomposition reaction?
Write one equation each for decomposition reactions where energy is supplied in form of heat,light and electricity.
Q.3 Define displacement reaction. Give an example.
Q.4 Why does colour of copper sulphate solution turns green when iron metal is dipped in it?Name the reaction.​

Answer 1

Answer:

answers

Explanation:

1. Magnesium ribbon should be cleaned before burning because it has a layer of magnesium oxide which resist it to get burnt.
2. When a compound breaks into two or more simpler compounds through the effect of heat light , and electricity.such reactions are called decomposition reaction