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Explain the terms with examples :
* Endothermic reaction

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The chemical reaction which are accompanied by absorption of heat are called endothermic reactions.
Example When calcium carbonate `(CaCO_3)` is strongly heated, it undergoes decomposition to form calcium oxide `(CaO)` and carbon dioxide `(CO_2)`
`underset("carbonate")underset("Calcium")(CaCO_(3(s)))+Heat rarrunderset("oxide")underset("Calcium")(CaO_((s)))+underset("dioxide")underset("Carbon")(CO_2uarr)`
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Knowledge Check

  • In endothermic reaction

    A
    Heat evolved is given positive sign
    B
    Change in enthalpy is given negative sign
    C
    Heat absorbed is given negative sign
    D
    None of these

  • In endothermic reaction

    A
    The enthalpy of reactions is more than that of products
    B
    Heat is given to the surroundings
    C
    `Delta H` is negative value
    D
    `Delta H` has positive value

  • In endothermic reaction

    A
    the enthalpy ofreactants is more than that of products
    B
    heat is given to the surroundings
    C
    `Delta H` has a positive value
    D
    `Delta U` has a negative value

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