Which of the following electronic configuration represents the most electropositive element?

1. 2, 1
2. 2, 8, 1
3. 2, 2
4. 2, 8, 2

Assertion (A): Alkali metals do not form dipositive ions.

Reason (R): After loss of one electron alkali metals achieve stable electronic configuration of noble gases.

1. Both A and R are true and R is the correct explanation of A
2. Both A and are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solution in excess, except:

1. aqueous potassium chloride
2. aqueous sodium sulphate
3. dilute sulphuric acid
4. sodium hydroxide solution

Which of the following about oxides is correct?

1. A basic oxide is an oxide of a non-metal
2. Acidic oxides contain ionic bonds
3. Amphoteric oxides contain a metal
4. Basic oxides are always gases