Answer:
Part A
(1)
Part B
Mixture of iron filings and sulphur on adding
Sulphur remains unreacted. (1)
Identification
gas formed has a foul smell and on passing through lead acetate solution, it turns the solution black. (2)
Hydrogen gas burns with a pop sound.
OR
(i) Number as mass per cent
(1)
(ii) Meena prepared solution of concentration.
(2)
(2)
Rita prepared solution of concentration.
So, the solution prepared by Rita has higher mass percentage than that of prepared by Meena. (2)
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