`{:(,"Chemical changes",,"Physical changes"),((i),"cutting of trees",(ii),"melting of butter in a pan"),((iii),"rusting of almirahs",(iv),"boiling of water to form steam"),((v),"passing of electric current through water and water breaking down into hydrogen and oxygen gases",(vi),"dissolving common salt in water"),((vii),"burning of paper and wood",,):}`