Potassium (at No. 19) and chlorine (at No.17) react to form a compound. Explain on the basis of electronic concept :

(i) oxidation

(ii) reduction

(iii) oxidising agent

(iv) reducing agent.

The bond formed between a metal and non-metal is called:

1. Polar covalent
2. Electrovalent
3. Covalent
4. Coordinate

The electronic configuration of Ca²⁺:

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

The formation of electrovalent bond is an example of:

1. Oxidation reaction
2. Reduction reaction
3. Displacement reaction
4. Redox reaction