Answer:
As part 'A' is heated, a compound FeS is formed by the
reaction between iron filings and sulphur. When dilute HCI is added to part A,
FeS will react with dil HCI to form H2S gas which has smell of
rotten eggs and will turn lead acetate paper black.
As part 'B' is not heated, so B is a mixture of iron
filings and sulphur powder. When dil, HCI is added to it, iron filings react
with dill. HCl to form (g)
which burns with a 'pop' sound if burning match stick is brought near it.
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