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.
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
Related Questions
State your observations:
(a) HCl gas is passed through lead nitrate solution and the mixture is heated.
(b) Hydrochloric acid is added to silver nitrate solution.
(c) Ammonium hydroxide solution is added to the resultant product of part (b).
Distinguish by using HCl.
(a) Lead nitrate solution and silver nitrate solution.
(b) Potassium sulphite and potassium sulphide.
The following questions pertain to the laboratory preparation of hydrogen chloride gas:
(i) Write the equation for it's preparation mentioning the condition required.
(ii) Name the drying agent used in the above preparation and give a reason for the choice.
(iii) State a safety precaution taken during the preparation of hydrochloric acid.
Identify the gas evolved and give the chemical test when dilute hydrochloric acid reacts with :
(i) Sodium sulphite.
(ii) Iron [II] sulphide.