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

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    67.

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

    1. From acids. Active metals such as Zn, Fe, Mg etc. react with dilute mineral acids (HCl, H2SO4 etc.) to produce dihydrogen gas.



    Since metals have displaced hydrogen from the acids, hence their reactions are called displacement reactions.

    2. From alkalies: Metals like Zn, Al, Sn, Pb, Sb etc. react with boiling sodium hydroxide solution to liberate hydrogen gas.
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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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