Question

a) List in tabular form three chemical properties on the basis of which we can differentiate between ametal and a non-metal.(b) Give reasons for the following:(i) Most metals conduct electricity well.(ii) The reaction of iron(iii) oxide [Fe₂O₃] with heated aluminium is used to join cracked machine parts.

Answer 1

Answer:

option iii is correct answer..

Answer 2

Answers regarding metals is given below-

Three chemical properties to differentiate between metal and non metal are-

Metals are good conductors of electricity and non metals are bad conductors of electricity.

Metals have Valence electrons usually 1,2,3 while non metals have high number of valence electrons.

Metals form unstable hydrides while non metals form stable hydrides.

Metals are good conductors of electricity due to presence of valence electrons which can easily mobilize and move to transmit current.

Aluminium being a reducing agent, reduces metal oxides into metal, here iron III oxide into iron. The metal can then be filled into the cracks.

The reaction being exothermic melts the metal, easing the procedure. The process is called thermite process.