An element X is placed in group IA of the periodic table because it forms:

1. An oxide which is acid

2. A volatile chloride having formula XCl₂

3. An ionic chloride having formula XCl

4. An insoluble chloride XCl₄

The dielectric constant of H₂O is 80. The electrostatic force of attraction between Na⁺ and Cl^- will be

1. reduced to $\frac{1}{40}$ in water than in air

2. reduced to $\frac{1}{80}$ in water than in air

3. will be increased to 80 in water than in air

4. will remain unchanged

Which pair of atom form strongest ionic bond?

(1) Al and As

(2) Al and N

(3) Al and Se

(4) AL and O

Which of the following pair of elements can form an ionic compound?

A Compound with maximum ionic character is formed from: