Question

answer all of them correct or will be reported ​

Answer 1

(a) add iron nails to the solution.

(b) add sodium to the solution

(c) add sodium ( in any form) to the solution

Based on periodic table

Hope it helps

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Answer 2

Answer:

a.2Cu+O2=cu2o+SO2 because after roasting sulphide convert into oxide

b.ZnCO3=ZnO+CO2 due to calcination

c.2HgS+3O2=2HgO+2SO2