Question

7) A sample of ammonium sulphate is warmed with aqueous Sodium hydroxide the gas produced a) Ignites with pop b) relishes glowing splint c) Turns damp red litmus paper to blue d) turns lime water milky ​

Answer 1

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Three ways in which ammonia gas can be identified is:

It has a sharp characteristic odor

When a glass rod dipped in HCl is brought in contact with the gas white color fumes of ammonium chloride are formed

It turns moist red litmus blue, moist turmeric paper brown, and phenolphthalein solution pink.



Explanation:

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Answer 2

c) Turns damp red litmus paper to blue is the correct answer.

1. The given substrates react as follows - (NH4)2SO4 + 2NaOH --> Na2SO4 + 2NH3 + 2H2O.
2. In the reaction, (NH4)2SO4 is ammonium sulphate, NaOH is sodium hydroxide, Na2SO4 is sodium sulphate, NH3 is ammonia and H2O is water.
3. The reaction takes place on heating.
4. Ammonia can be identified by litmus paper only in presence of water. It turns litmus paper blue. The gas also has choking smell as it's characteristic trait.