Question

13. You must have seen tarnished copper vessels being cleaned with lemon or tamarind
juice. Explain why these sour substances are effective in cleaning the vessels.
14. Differentiate between metal and non-metal on the basis of their chemical properties.​

Answer 1

1. metals are lustrous whereas non metal have no lustre
2. generally metals are malleable and ductile non metals do not have these properties
3. some metals react with acids to produce metal salts and hydrogen gas generally non metals don't react with acids