Question

State why addition of sodium chloride to water is considered a physical change while addition of dilute sulphuric acid to zinc is considered a chemical change.​

Answer 1

Answer:

Explanation:

when you add sodium chloride to water no new product is formed. the two components water and salt are simply mixed together. by the process of simple evaporation, you can obtain salt and water back in its original forms.

2) But when zinc is added to dil sulphuric acid, a reaction known a displacement reaction takes place in which zinc displaces hydrogen to form zinc sulphate and hydrogen separately. After the reaction takes place it is unable to obtain zinc and sulphuric acid again.

H2SO4+Zn gives ZnSO4+H2