Question

Answer the following : 

(i) What is the outer electronic configuration of group IIA elements ? 

(ii) Name the first two elements of group IIIA. 

(iii) What is Tincal ? 

(iv) What is thermite mixture ? 

(v) What is inorganic benzene ? 

(vi) Name the two metals present in common alum. 

(vii) Name the aluminium compound used in Friedel Craft’s reaction. 

Answer 1

(i) ns²np¹ 

(ii) Boron and aluminium 

(iii) It is a mineral of boron. Its composition is Na₂B₄O₇.10H₂O 

(iv) Mixture containing 1 part Al powder and 3 parts Fe₂O₃ or Cr₂O₃ 

(v) Borazole or borazine, B₃N₃H₆ is known as inorganic benzene 

(vi) Common alum is the double sulphate of potassium and aluminium. Its composition is, K₂SO₄.Al₂(SO₄)₃.24H₂O 

(vii) Anhydrous aluminium chloride, AlCl₃.