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Sulphuric Acid

Conc. H2SO4...

Question

Conc. $H_{2} S O_{4}$ , anhydrous $C a {C l}_{2}$ or $P_{4} O_{10}$ cannot be used as drying agent for ammonia, why?

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Solution

Calcium oxide is used as drying agent for ammonia as both are basic in nature and do not undergo any reaction, while any acidic drying agent undergoes reaction with ammonia.

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C a {C l}_{2}, H_{2} S O_{4}

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, which compound can be used for the drying of ammonia gas? Why?

Q. (i) How is ammonia gas prepared in laboratory starting from NH₄Cl? State the conditions and balanced equation for the preparation.
(ii) How is gas collected in a gas jar?
(iii) Name the substance used for drying ammonia gas. Why cannot substances such as conc. H₂SO₄, anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?

For ammonia, why is quicklime used as the drying agent?

Explain clearly how conc. $H_{2} S O_{4}$ is used as dehydrating as well as drying agent.

Q. For drying ammonia gas sulphuric acid is used as dehydrating agent – True or False?

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