How would you prepare dihydrogen from water using a reducing age
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    Hydrogen

    Multiple Choice QuestionsShort Answer Type

    61.

    Give an examples showing electronegative character of hydrogen. 

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    Multiple Choice QuestionsLong Answer Type

    62.

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

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    Multiple Choice QuestionsShort Answer Type

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

    1. By the action of water on metals:
    (i) Active metals like N,a, K, Ca etc. decompose water at room temperature to liberate hydrogen gas.


    (ii) Less active metals like Mg, Al or Zn decompose boiling water producing dihydrogen gas.


    (iii) Still less active metals like iron, tin or nickel decompose steam at high temperature.



    2. By passing steam over red-hot coke:
    When steam is passed over red-hot coke (carbon) at 1270 K, a mixture of carbon monoxide and dihydrogen called water gas is produced.



    Dihydrogen is then recovered from water gas either by liquefaction or by Bosch process.
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    67.

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

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    Multiple Choice QuestionsShort Answer Type

    68.

    How would you prepare pure dihydrogen in the laboratory?

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    Multiple Choice QuestionsLong Answer Type

    69. How will you prepare hydrogen in laboratory?
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    Multiple Choice QuestionsShort Answer Type

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