Chemistry
Name :
(a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases, which when mixed produce a white solid
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved.
(f) the experiment which demonstrates that hydrogen chloride is soluble in water.
(g) the gas produced when chlorine water is exposed to sunlight.
Hydrogen Chloride
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Answer
(a) Black copper oxide reacts with hydrochloric acid to give a coloured solution.
CuO + 2HCl ⟶ CuCl2 + H2O
(b) Hydrogen chloride and ammonia, when mixed, produce ammonium chloride.
NH3 (g) + HCl (g) ⟶ NH4Cl
(c) Hydrogen and oxygen combine to form water. This can be shown as:
2H2 (g) + O2 (g) ⟶ 2H2O
(d) Silver chloride
(e) Aqua Regia
Aqua regia : 1 part of conc. HNO3 and 3 parts of conc. HCl
(f) Fountain experiment
(g) Oxygen gas
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Related Questions
(a) Name an element which reacts with hydrogen to form compound which is strongly acidic in water.
(b) Explain why dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%
How will you prove that Hydrochloric acid contains
(i) hydrogen
(ii) chlorine.
Write equations for the reactions.
Solution A reacts with an acid B (which gives greenish yellow gas on reacting with oxidising agents like Pb3O4) to give white precipitate C insoluble in nitric acid but soluble in ammonium hydroxide. Name A, B and C.
Complete and balance the following reactions, state whether dilute or conc. acid is used.
(a) NH4OH + HCl ⟶
(b) NaHSO3 + HCl ⟶
(c) Pb(NO3)2 + HCl ⟶
(d) Pb3O4 + HCl ⟶