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Explain the formation of scum when hard ...

Explain the formation of scum when hard water is treated with soap.

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Hard water contains calcium and magnesium salts. When soap is treated with hard water, then the calcium and magnesium ions of hard water react with soap to form an insoluble precipitate called scum. The scum is formed because the calcium and magnesium salts of soap are insoluble in water.
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(a) Write structure of ethanol. Give chemical equation of its reaction with (i) sodium (ii) excess conc H_2SO_4 at 443 K. (b) (i) Write your observation, if you dip a red litmus paper in soap solution. (ii) Explain the formation of scum in hard water. (iii) Suggest one method to remove the temporary hardness of water. 1

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LAKHMIR SINGH & MANJIT KAUR-CARBON AND ITS COMPOUNDS-Exercise
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  4. Would you be able to check if water is hard by using a detergent?

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  6. Ethane with the molecular formula C(2)H(6) has: (a) 6 covalent bonds...

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  7. Butanone is a four-carbon compound with the functional group

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  8. While cooking, if the bottom of the vessel is getting blackened on the...

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  9. Explain the nature of the covalent bond using the bond formation in CH...

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  10. Draw the electron dot structures for

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  11. What is a homologous series ? Explain with an example.

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  12. How can ethanol and ethanoic acid be differentiated on the basis of th...

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  13. Why does micelle formation take place when soap is added to water? Wil...

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  14. Why are carbon and its compounds used as fuels for most applications?

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  15. Explain the formation of scum when hard water is treated with soap.

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  16. What change will you observe if you test soap with litmus paper (red a...

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  17. What is hydrogenation? What is its industrial application?

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  18. Which of the following hydrocarbons undergo addition reactions: C(2)H...

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  19. Give a test that can be used to differentiate chemically between butte...

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  20. Explain the mechanism of the cleaning action of soaps.

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