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How many allotropes of dihydrogen are kn...

How many allotropes of dihydrogen are known? What is their importance?

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There are two allotrops of dihydrogen : (i) Ortho-hydrogen and (ii) Para-hydrogen The ortho-and para-hydrogen vary with temperature and have differences in their liquification and stability.
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CENGAGE CHEMISTRY-HYDROGEN, WATER AND HYDROGEN PEROXIDE-Ex 3.2
  1. Is it correct to say that hydrogen can behaves as a metal? State the c...

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  2. Name the isotopes of hydrogen. What is importance of the heavier isoto...

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  3. How many allotropes of dihydrogen are known? What is their importance?

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  4. Name the class of hydrides to which H(2)O(2),B(2)H(6),NaH and LaH(3) b...

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  5. Hydrogen forms three types of bond in its compounds. Describe each typ...

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  6. Elements with atomic numbers 17 and 20 form compounds with hydrogen. W...

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  7. Complete the following reactions. a.CaO((s))+H(2(g))to,b.CO(g)+H(2(g...

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  8. Describe some unusual properties of water.

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  9. What is the difference between hydrolysis and hydrations?

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  10. What is understood by hydrogenations?

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  11. What are the advantanges in using hydrogen as a fuel?

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  12. Ionic hydrides are frequently used to remove traces of water from orga...

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  13. Although D(2)O resembles H(2)O chemically yet it is a toxic substance....

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

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  15. Why is ice dense than water and what kind of attractive force must be ...

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  16. A white solid is either Na(2)O or Na(2)O. A piece of red litmus paper ...

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  17. Explain the following. a. Hydrated barium peroxide is used in the pr...

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  18. An element has the minimum and maximum oxidation states as -X and +X r...

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  19. Give reason for the following a. The process 1/2H(2(g))+e^(ɵ)toH((g)...

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  20. The degree of hardness of a given sample of hard water is 40 p p m. If...

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