SolveItClass 10 · NCERT

NCERT Solutions · Class 10 Science Chemical Reactions and Equations

20 questions · 20 still being checked

EXERCISES 11–20 (part 2 of 2)

  1. Exercise 11

    Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

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  2. Exercise 12

    Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

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  3. Exercise 13

    What is the difference between displacement and double displacement reactions? Write equations for these reactions.

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  4. Exercise 14

    In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

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  5. Exercise 15

    What do you mean by a precipitation reaction? Explain by giving examples.

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  6. Exercise 16

    Explain the following in terms of gain or loss of oxygen with two examples each.
    (a)
    Oxidation
    (b)
    Reduction

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  7. Exercise 17

    A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

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  8. Exercise 18

    Why do we apply paint on iron articles?

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  9. Exercise 19

    Oil and fat containing food items are flushed with nitrogen. Why?

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  10. Exercise 20

    Explain the following terms with one example each.
    (a)
    Corrosion
    (b)
    Rancidity

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