5. Explain one example for each of the following. a) A redox reaction which is also a combination reaction. b) A redox reaction which is also a displacement reaction. c) A reaction in which hygrogen gas is liberated. d) A reaction taking place in the presence of sunlight. e) A reaction in which precipitate is formed.
Answers
(a)Fe +S ⇒ FeS
In the following reaction iron is loosing electrons n sulpher is gaining those electrons so this combination reaction is redox reaction as well
(b)Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
In the following reaction Fe displaces Cu from CuSO4.Fe gets oxidised while Cu gets reduced.
(c)Zn + H2SO4 ⇒ ZnSO4+H2
in a displacement reaction hydrogen gas can be explained as those element which are above h in reactivity series can be displaced h from its solution
(d)The reactions which takes place in the presence of sunlight is photosynthesis.
Ex. 6 CO2 + 6 H2O + ligh t⇒ C6H12O6 + 6 O2
(e)AgNO3(aqueous) + KCl(aqueous) —–AgCl(precipitate) + KNO3(aqueous)
In the reaction of potassium chloride and silver nitrate, results in the formation of silver chloride(AgCl) which is a white precipitate in a solid-state and insoluble in water.