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

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

Acids, Bases and Salts | Chemistry | Class 10 | ICSE | Selina

(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?

(a) Since dry HCl gas has no hydrogen ions in it compared to its aqueous solution, it does not show acid action. Therefore, dry HCl gas does not change the color of dry litmus paper.

(b) Lead oxide reacts with hydrochloric acid to produce lead and water chloride which is why metallic oxide, but is not extracted from the base phase as chlorine is also produced.

PbO₂ + 4HCl → PbCl₂ + Cl₂ + 2H₂O

Therefore, lead oxide is not basic.

(c) Yes, basic solutions contain H + ions, but the concentration of OH– ions is higher than H + ions which makes the solution fundamental to the environment.

First, we must understand that the formation of hydrogen ions and hydroxyl ions complement each other when each other is produced.

Example: An aqueous solution of NaOH ionizes to produce a higher concentration of hydroxyl ion than hydrogen ion and that is why NaOH is a natural by-product.

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