Question

1. name two metals obtained from their metal oxides by electrolytic reduction.

2.name a non-metal which shows valencies of 2,4 and .

3.What is the difference between concentrated and dilute suphuric acid?

Answer 1

1) Aluminium and Iron etc are the metals that can be obtained by electrolytic reduction. Because no suitable chemical reducing agent is available.
2) Carbon is a non-metal whose electronic configuration is 2,4 and it shows a valency of four. Valency 2 is shown by Sulphur a non-metal.
3) ​Dilute and concentrated are the relative terms to describe the amount of acid in water. Concentrated acid means that there is high concentration of acid in water.. If we say that, sulphuric acid is concentrated, it just mean that amount of sulphuric acid is very high in water while dilute sulphuric acid has very low concentration of acid in water.