. (a) Dry HCl gas does not change the colour of dry litmus paper

(a) Dry HCl gas does not change the colour of dry litmus paper. Why?

(b) ls PbO2 a base or not? Comment.

(c) Do basic solutions also have H+(aq)? Explain why they are basic by taking an example?


Best Answer

a. Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. Hence, dry HCl gas does not change the colour of dry litmus paper.

b. Lead oxide is a metallic oxide which reacts with hydrochloric acid to produce lead chloride and water, but it is excluded from the class of bases, because chlorine is also produced.

 PbO2 + 4HCl → PbCl2 + Cl2 + 2H2O

 Thus, lead oxide is not a base.

c. Yes, basic solutions have H+ ions, but the concentration of OH- ions is more than the H+ ions which makes the solution basic in nature.


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