Question

1.) There are _______ elements known till now.
2.) Common salt is made of _________ and ________.
3.)Melting of wax is a/an ______ change.
4.) Iron nails dipped in a solution of copper sulphate Aqua a reddish brown- copper colour this is an example of a ___________ change.​

Answer 1

Answer:

thanks

Explanation:

126

Na

Cl

physical