1. What is the action of red litmus on (i) Dry ammonia gas (ii) solution of ammonia gas in water ?
2. Explain how acid rain is one of the major cause for discoloring of Taj Mahal. [3 MARKS]

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Solution

Each point: 1 Mark

1. Red litmus has no action on dry ammonia gas, because it does not release any hydroxyl ions (OH)^–.
2. When passed through water, ammonia (NH₃) is converted to ammonium hydroxide (NH₄OH). It dissociates to give hydroxyl ions (OH)^– and the solution is basic in nature. Red litmus acquires a blue colour.
3. Taj Mahal is made up of substance that is basic in nature, so acid rain reacts with this material and causes discoloring.

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1. What is the action of red litmus on (i) Dry ammonia gas (ii) solution of ammonia gas in water ? 2. Explain how acid rain is one of the major cause for discoloring of Taj Mahal. [3 MARKS]

1. What is the action of red litmus on (i) Dry ammonia gas (ii) solution of ammonia gas in water ?
2. Explain how acid rain is one of the major cause for discoloring of Taj Mahal. [3 MARKS]