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1. why respiration is known as …

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1. why respiration is known as a decomposition reaction? 2. what is exothermic and endothermic reaction with example? 3. ‘A’ brown shiny metal react with oxygen change in to black colour compound B’. Identify A& B. 4.A blue colour solution of CuSO4 is changed into light green by mixing element ‘B’ . identify B, write reaction and also write types of reactions? 5. What happens when FeSO4 heated. write complete reaction? 6. What is precipitation with example? 7. How can you say a chemical reaction occurs? 8. Define corrosion and rusting. 9. What is the formulae of rust. 10.Explain the types of chemicals reaction with example. 11. What type of chemical reaction is used to extract several metals from their naturally occurring compounds like oxides or chlorides.

    • Posted by Jayesh King 6 years, 3 months ago

    CBSE > Class 10 > Science
    • 11 answers

    Aadya Singh ? 6 years, 3 months ago

    11) Reduction.

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    Aadya Singh ? 6 years, 3 months ago

    8) Different types of chemical reaction are - Decomposition, Combination, Displacement, Double displacement, Reduction and Oxidation.

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    Aadya Singh ? 6 years, 3 months ago

    9) 2Fe2O3.xH2O.

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    Aadya Singh ? 6 years, 3 months ago

    8) Corrosion- The process by which the surface of metal are slowly eaten away by air, moisture, etc.
    Rusting - Corrosion of iron is known as rusting.

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    Aadya Singh ? 6 years, 3 months ago

    7) When gas is evolved, precipitate is formed, colour is changed, temperature is changed and state is changed, then chemical reaction occurs.

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    Aadya Singh ? 6 years, 3 months ago

    6) The reaction in which an insoluble solid called precipitate is formed is called precipitation reaction. Example -
    AgNO3 + NaCl --------> AgCl (white precipitate) + NaNO3.

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    Aadya Singh ? 6 years, 3 months ago

    5) 2FeSO4 ---------> Fe2O3 + SO2 + SO3

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    Aadya Singh ? 6 years, 3 months ago

    4) B is iron. It is displacement reaction.
    Fe + CuSO4 ------> FeSO4 + Cu.

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    Aadya Singh ? 6 years, 3 months ago

    3) A is copper and B is copper oxide.

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    Aadya Singh ? 6 years, 3 months ago

    2) Exothermic reaction- The reaction in which heat is evolved. Example- CaO + H2O ---------> Ca(OH)2 + Heat.
    Endothermic reaction-
    The reaction in which heat is absorbed. Example- N2+ O2 + Heat -------> 2NO.

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    Aadya Singh ? 6 years, 3 months ago

    1) Respiration is known as decomposition reaction because in respiration, glucose molecules are decomposed into simpler form of CO2 and water molecules.

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