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Give an example of endothermic reaction....

Give an example of 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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Give an example of exothermic reaction.

(a) What do you understned by exothermic and endothermic reactions ? (b) Give one example of an exothermic reaction and one of an endothermic reaction. (c ) Which of the following are endothermic reactions and which are exothermic reactions ? {:((i),"Burning of natural gas",(ii),"Photosynthesis"),((iii),"Electrolysis of water",(iv),"Respiration"),((v),"Decomposition of calcium carbonate",,):}

Knowledge Check

  • Which of the following is an example of endothermic reaction

    A
    `C_(2)H_(2)+2H_(2)rarrC_(2)H_(6),DeltaE=-314.0 kJ`
    B
    `C+O_(2)rarrCO_(2),DeltaE=-393.5 kJ`
    C
    `N_(2)+O_(2)rarr2NO,DeltaE-180.5 kJ`
    D
    `2H_(2)+O_(2)rarr2H_(2)O, DeltaE+571.8 kJ`

  • 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

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