3. Consider the oxides: NO 2 and BaO (a) One is a basic oxide the other is an ac

Question

3. Consider the oxides:   NO2 and BaO

(a) One is a basic oxide the other is an acidic oxide.Which is which?

(b) Justify your choice in part (a)

(c) Below, for each of these oxides, two balanced equations are written. In each case, ONLY ONE EQUATION IS CORRECT. Select the correct equation for each oxide

(i) NO2   + 2 H2O ---> N(OH)4   -------> N(OH)3(aq)+ + OH -(aq)

(ii) NO2   +   H2O ---> NO(OH)2 -------> NO2(OH)- + H+(aq)

(i) BaO +   H2O ---> Ba(OH)2 -------> Ba+2(aq)   + 2 OH -(aq)

(ii) BaO   +   H2O + OH - ---> Ba(OH)3-(aq)

Explanation / Answer

a) NO2 is an acidic oxide   and BaO is a basic oxide

b) Generally metal oxides are basic oxides and non-metal oxides are acidic in nature.Because metal oxides on treatment with water, they produce alkalies i.e. basic solutions, whereas non-metal oxides produce acidic solutions.

So, NO2 is an acidic oxide   and BaO is a basic oxide

c)

(ii) NO2   +   H2O ---> NO(OH)2 -------> NO2(OH)- + H+(aq)

(i) BaO +   H2O ---> Ba(OH)2 -------> Ba+2(aq)   + 2 OH -(aq)

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