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a. What does [H(9)O(4)]^(o+) stand for ?...

a. What does `[H_(9)O_(4)]^(o+)` stand for ? Draw its structures.
b. Can sodium bicarbonate make water hard?
c. Hard water is softened before using in boilers. Why?
d. What is sequestration? How is hard water made soft by sequestration?

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MODERN PUBLICATION-HYDROGEN-REVISION EXERCISES (Very Short Answer Questions)
  1. Name two metals which can displace hydrogen from acids.

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  2. Which isotope of hydrogen is radioactive in nature?

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  3. a. What does [H(9)O(4)]^(o+) stand for ? Draw its structures. b. Can...

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  4. What is meant by autoprotolysis of water ?

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  5. Which of the following is the most reactive towards ring nitration ?

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  6. How does O(3) react with lead sulphide ? Write chemical equation.

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  7. Bleaching action of H(2)O(2) is due to its :

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  8. What happens when phosphoric acid is heated ?

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  9. Give an example of (i) ionic hydride, (ii) covalent hydride.

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  10. Calcium carbide reacts with water to produce

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  11. Complete the following reactions: (i) XeF2 + H2 to , (ii) XeF6 + Si...

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  12. Complete the following reactions: (i) XeF2 + H2 to , (ii) XeF6 + Si...

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  13. Complete the following reactions: (i) CaO(s)+H(2)O(l)to Na(2)O(s)...

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  14. Why do lakes freeze from water top towards bottom?

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  15. Explain why water has high boling and melting points are compared to H...

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  16. Write chemical reactions to show the amphoteric nature of water.

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  17. What is meant by dispersion of light ?

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  18. How is temporary hardness in water removed?

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  19. Which of the following ions will cause hardness in water sample?

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  20. Which of the following ions will cause hardness in water sample?

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