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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?

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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?

(i) Completely pure zinc metal is not used for the preparation of hydrogen because it is slowly attacked by the acid. The presence of impurities increases the rate of the reaction by forming electrochemical couples.

(ii) Concentrated H₂SO₄ cannot be used for the preparation of hydrogen gas as it results in the formation of SO₂ gas instead of H₂ from zinc.

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