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(i) Write the name given to bases that a...

(i) Write the name given to bases that are highly soluble in water. Give an example.
(ii) How is tooth decay related to pH? How can it be prevented?
(iii) Why does bee-sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How?

Text Solution

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(a) Alkali, Eg. NaOH (Sodium hydroxide) .
(b) Lower the pH, more will be tooth decay. Acid reacts with `Ca_(3) (PO_(4))_(2)` and cause tooth decay.
It can be prevented by brushing teeth after every meal.
(c) It is due to Formic acid. Sodium hydrogen carbonate (Baking soda) neutralises Formic acid giving relief.
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CPC CAMBRIDGE PUBLICATION-ACIDS, BASES AND SALTS-ADDITIONAL QUESTIONS (Answer the following questions :)
  1. What are amphoteric substances? Illustrates with an example.

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  2. On the basis of origin, how acids are classified?

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  3. Why vinegar is used in pickling?

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  4. Define dilution.

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  5. (a) Write the common name of CaOCl2 How it is prepared? Write the chem...

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  6. W'hat are organic acids? Give two examples.

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  7. How does a strong acid differ from a concentrated acid?

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  8. Why should curd and sour substances not be kept in brass and copper ve...

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  9. Why should acids be handled with care?

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  10. While diluting an acid, why is it recommended that the acid should be ...

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  11. 15 ml of water and 10 ml of Sulphuric acid are mixed in a beaker. (...

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  12. A white coloured powder is used by doctors for supporting fractured bo...

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  13. (i) Write the name given to bases that are highly soluble in water. Gi...

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  14. (i) Give the constituents of baking powder. (ii) Why cake or bread s...

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  15. How will you test for the gas which is liberated when hydrochloric aci...

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  16. Sodium hydrogen carbonate is a basic salt. Justify the statement how i...

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  17. Mention the colour of FeSO(4). 7H(2)O crystals . How does this colour ...

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  18. What happens when chlorine is passed over slacked lime at 313k? Write ...

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  19. What is meant by water of Crystallisation ? How do you show that coppe...

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  20. Why does 1 m HCI solution have a higher concentration of H^(+) ions th...

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