Chemistry
State one relevant observation for each of the following:
(i) Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
(ii) At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
(iii) Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
(iv) Anhydrous calcium chloride is exposed to air for some time.
(v) Barium chloride solution is slowly added to sodium sulphate solution.
Electrolysis
ICSE 2018
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Answer
(i) Chalky white precipitate is formed which is soluble in excess of sodium hydroxide and forms a colourless solution.
(ii) At the anode, brown fumes of bromine vapours are observed.
(iii) White precipitate of PbCl2 is formed which is soluble in hot water.
Pb(NO3)2 + 2HCl ⟶ PbCl2 + 2HNO3
(iv) It absorbs moisture from the atmosphere, dissolve in the same and change into a solution. This property is known as deliquescence
(v) A white ppt. is obtained which is insoluble in dil. HCl or dil. HNO3
Na2SO4 + BaCl2 ⟶ BaSO4 ↓ [white ppt.] + 2NaCl
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