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Hydrogen

Short Answer Type

61.

Give an examples showing electronegative character of hydrogen.

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Long Answer Type

62.

What are isotopes? Discuss briefly the various isotopes of hydrogen.

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Short Answer Type

63. Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

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Long Answer Type

64. How do the isotopes of hydrogen differ from each other in their properties? In what physical properties do hydrogen and deuterium differ?

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65.

Write a short note on allotropy of hydrogen.
Or
How many allotropes of dihydrogen are known? What is their importance?

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66.

How would you prepare dihydrogen from water using a reducing agent?

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67.

How would you prepare dihydrogen from a substance other than water?

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Short Answer Type

68.
How would you prepare pure dihydrogen in the laboratory?

(i) A sample of pure dihydrogen can be prepared by the action of pure dilute sulphuric acid on magnesium.

(iii) By the electrolysis of barium hydroxide solution in a U-tube using platinum electrodes or nickel electrodes.

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Long Answer Type

69. How will you prepare hydrogen in laboratory?

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Short Answer Type

70. Why are pure zinc and concentrated sulphuric acid not used in the preparation of hydrogen?

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68. How would you prepare pure dihydrogen in the laboratory?

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Short Answer Type

68.
How would you prepare pure dihydrogen in the laboratory?