Question

State one relevant observation for each of the following:
1. Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
2. At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
3. Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
4. Anhydrous calcium chloride is exposed to air for some time.
5. Barium chloride solution is slowly added to sodium sulphate solution.

Answer 1

Icse 2018 chemistry question paper.... Ri8?

1. A white colour precipitate is formed and it will dissolve to give a colourless solution when sodium hydroxide is in excess.
2.Brown fumes of bromine.
3.A white precipitate of lead chloride is obtained.
4.It dissolves in atmospheric moisture to give a saturated solution.
5.White precipitate of Barium sulphate is obtained.

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Answer 2

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