Q. 26

A metal ‘M’ is st

Answer :

(A) Sodium

(B) Sodium Oxide Na2O


4Na+O22Na2O


(C) Sodium metal is kept in kerosene oil to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and forms Sodium hydroxide which is a highly exothermic reaction.


2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g) + heat energy


(d) Sodium oxide reacts with hydrochloric acid to produce sodium chloride and water.


Na2O + 2HCl 2NaCl + H2O


(e) (i) 4Na + O2 2Na2O


(ii) 2Na + 2H2O 2NaOH + H2


(iii) Na2O + 2HCl H2O + 2NaCl


OR


(A)


AND


(B)



(C)Calcium ion and oxygen ion


(d) It is an ionic compound having properties :


1. They have high melting and boiling points.


1. They are hard.


2. They have high electrical conductivity.


3. They form crystals.


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