Question

give reason : Brisk effervescence is seen when oil of vitriol is added to sodium carbonate ... ?

Answer 1

hey

This is due to release of CARBON DIOXIDE gas. It is a odourless and colourless gas.

when sodium carbonate reacts with ethanoic acid, Salt, water and CO2 gas is released.

hope this helps

Answer 2

Que: Why are the sound waves are called mechanical waves?

Ans: Because they required material medium to propagate.