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What happens when : 

(i) Borax is heated strongly 

(ii) Aluminium is heated with caustic soda solution. 

(iii) A mixture of borax and cobalt oxide is heated in a flame. 

(iv) Water is added to aluminium nitride. 

(v) Aluminium reacts with HNO3.

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(i) Na2B4O7.10H2O + (- 10H2O) → Na2B4O7 → 2NaBO2 + B2O

(ii) 2AI + 2NaOH + 2H2 2NaAIO2 + 3H

(iii) Na2B4O7.10H2O + (- 10H2O)  Na2B4O7 → 2NaBO2 + B2O3 

B2O3 + CoO  Co(BO2)

(iv) AIN + 3H2 AI(OH)3 + NH

(v) Nitric acid whether dilute or concentrated hardly affects aluminium at all. Aluminium is rendered passive. A thin film of Al2O3 is formed on the surface of the metal. 

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