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A metal (E) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue. 

(i) Name the metal (E). 

(ii)Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. 

(iii) Explain the process by which the metal is obtained from its molten chloride.

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(i) ‘E’ is sodium which catches fire in presence of moisture. 

(ii) 4Na + O2 → 2Na2O

Na2O + H2O → 2NaOH

(iii) Electrolytic reduction: Electric current is passed through molten NaCl. Sodium is formed at cathode and chlorine gas is liberated at anode.

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