3. Explain what happens when added a mixture of sulphur powder and iron
filing to carbon di sulphide? What happens when it is added to Sulphuric
acid or Hydrochloric acid? What would be the result when iron sulphide
(the black mass) is added to the above acid? How would you identify
them?(4)
4. Define Tyndall effect? What kind of mixtures exhibit it? What is the
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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.
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