What happens when (i) lead (II) nitrate is heated ? (ii) iron (II) sulphate is heated ? (iii) silver…
What happens when
(i) lead (II) nitrate is heated ?
(ii) iron (II) sulphate is heated ?
(iii) silver chloride is exposed to sunlight ?
Write balanced chemical equations of the reactions involved in support of your answer. [3×1]
Solution
(i) Brown fumes of nitrogen dioxide are formed.
Heat
2Pb(NO3 )2 (s) → 2PbO(s) + 4ΝΟ2 (g) + Ο2 (g)
(ii) Smell of burning sulphur is observed/ Colour of crystal
changes.
Heat
2FeSO4 (s) → Fe2 O3 (s) + SO2 (g) + SO3 (g)
(iii) White silver chloride turns grey.
Sunlight
2AgCl (s) → 2Ag(s) + Cl2 (g)
(Note: Award full marks if balanced chemical equation is written)