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Why is dihydrogen used in welding of hig...

Why is dihydrogen used in welding of high melting metals ?

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Gas used is welding is

Illustrate the chemistry of dihydrogen by its reaction with i) N_(2) ii) Metal ions and metal oxides and iii) Organic compounds. How is dihydrogen used in the manufacture of chemicals ?

Knowledge Check

  • Silica is high melting solid, because

    A
    It exists as discrete molecules
    B
    It has many resonance structures
    C
    It has gaint network structure
    D
    Each Si atom is surrounded by 4 Si atoms

  • Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously

    A
    Li
    B
    Na
    C
    K
    D
    Cs

  • Acrylon is hard, horny and a high melting material. Which of the following represents its structure.

    A
    `(-CH_(2)-underset(CN)underset(|)(CH)-)_(n)`
    B
    `(-CH_(2)-underset(COOCH_(3))underset(|)overset(CH_(3))overset(|)(C)-)_(n)`
    C
    `(-CH_(2)-underset(COOC_(2)H_(5))underset(|)(CH)-)_(n)`
    D
    `(-CH_(2)-underset(Cl)underset(|)(CH)-)_(n)`

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    Illustrate the chemistry of dihydrogen by its reaction with (c ) Organic compounds How is dihydrogen used in the manufacture of chemicals?

    Transition elements have high melting points. Why ?

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    Which method do you suggest for extracting of high reactivity metals?

    What will happen if a fuse contains a wire with high melting point ?

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