Chemistry
A gas 'P' gives dense white fumes with chlorine. It's aqueous solution gives a blue colour with copper (II) hydroxide. Give the name and formula of the gas P.
Ammonia
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Answer
Gas 'P' is Ammonia and its formula is NH3.
With chlorine, ammonia gas gives dense white fumes of NH4Cl.
8NH3 [excess] + 3Cl2 ⟶ 6NH4Cl + N2
Reaction of copper (II) hydroxide with aqueous solution of Ammonia (NH4OH) is given below:
Cu(OH)2 + (NH4)2SO4 + 2NH4OH ⟶ [Cu(NH3)4]SO4 + 4H2O
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Ammonia solution in water gives a blue precipitate when it combines with a solution of copper salt. The blue precipitate further dissolves in excess of ammonia solution to give an azure blue solution. Explain with equation.
Pick the odd member from the list giving reasons:
(a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide.
(b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide.
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(a) Liquid ammonia is used as a refrigerant in ice plants.
(b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes.
(c) Aqueous solution of ammonia gives a pungent smell.
(d) Aqueous solution of ammonia conducts electricity.
Give chemical equation(s) to prove that NH3 contains nitrogen and hydrogen?