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What is scum? How is it formed?...

What is scum? How is it formed?

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**Step-by-Step Solution:** 1. **Definition of Scum**: Scum is a white precipitate that forms when soap is used in hard water. It is primarily composed of calcium and magnesium salts that react with soap. 2. **Understanding Hard Water**: Hard water contains high concentrations of calcium ions (Ca²⁺) and magnesium ions (Mg²⁺). These ions are responsible for the inability of soap to form lather. 3. **Reaction with Soap**: When soap (such as sodium stearate) is added to hard water, the calcium and magnesium ions react with the soap to form insoluble salts. ...
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MTG IIT JEE FOUNDATION-CARBON AND ITS COMPOUNDS -Subjective Problems (Short Answer Type)
  1. Name the gas evolved when ethanoic acid is added to sodium carbonate. ...

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  2. Give reasons for the following observations : Air holes of a gas bur...

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  3. Give reasons for the following observations : Use of synthetic deter...

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  4. An organic compound 'X' with molecular formula C(2)H(6)O, on oxidation...

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  5. What is a 'homologous series' of substance?

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  6. In an organic compound, which parts largely determine its physical and...

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  7. Write a chemical equation to represent the reaction of ethanol with ac...

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  8. 1000 "cm"^(3) of propane is burnt completely in oxygen. What is the ...

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  9. 1000 "cm"^(3) of propane is burnt completely in oxygen. Draw the ele...

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  10. 1000 "cm"^(3) of propane is burnt completely in oxygen. Write the ba...

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  11. An organic compound 'X' which is sometimes used as antifreeze has the ...

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  12. What are the reactive sites for addition reactions in unsaturated hydr...

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  13. Three hydrocarbons A, B and C have melting points -183^(@)C,-138^(@)C,...

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  14. What is meant by saponification? Give an example.

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  15. What is esterification? Or What happens when ethyl and acetic acid rea...

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  16. What is scum? How is it formed?

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  17. What are the advantages of synthetic detergents over soaps?

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  18. Write a chemical test to distinguish between ethanol ad ethanoic acid.

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  19. What is meant by decarboxylation? Explain with example.

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  20. Two carbon compounds A and B have the molecular formulae C(3)H(8) and ...

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