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प्रश्न
List the properties of ammonia that make it
(i) A good refrigerant
(ii) A cleaning agent
(iii) As a source of hydrogen
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उत्तर
(i) Liquid ammonia is used as refrigerant as:
(a) It is highly volatile
(b) It has high specific latent heat of vaporization. 1 mole (17g) of liquid ammonia vaporises by absorbing 5.7 kcals of heat from the surroundings, which is there by cooled.
(c) It easily liquefies under pressure at room temperature.
(ii) Ammonia emulsifies fats and grease. Thus it is used to clean oils, fats and body grease etc. from clothes.
(iii) Liquid hydrogen is dangerous to transport as it is highly combustible. Thus, hydrogen is converted to liquid ammonia and transported in cylinders. Later it is catalytically converted to hydrogen.
Key: Uses of ammonia
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संबंधित प्रश्न
What property of ammonia is demonstrated by the fountain experiment?
State what you observe when a piece of moist red litmus paper is placed in a gas jar of ammonia.
Name a metallic chloride soluble in ammonium hydroxide.
State your observation for the following cases
(i) Ammonia gas is burnt in an atomosphere of oxygen in the absence of a catalyst
(ii) Glass rod dipped in ammonium hydroxide is brought near the mouth of the concentrated hydrochloric acid bottle
Name the gas evolved when the following mixtures are heated.
Calcium hydroxide and ammonium chloride
Name the gas evolved when the following mixtures are heated:
Sodium nitrate and ammonium chloride.
Identify the substance underlined, in the following case:
A solid formed by reaction of two gaes, one of which is acidic and the other basic in nature.
What do you observe when Ammonium solution is added to ferric chloride solution.
What do you observe when Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
