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(a) What do you understned by exothermic...

(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",,):}`

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The correct Answer is:
(d)
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Knowledge Check

  • Which of the following is an exothermic reaction?

    A
    `N_(2(g))+O_(2(g))+180.8 kJ rarr 2NO_((g))`
    B
    `N_(2(g))+3H_(2(g))-92kJ rarr 2NH_(3(g))`
    C
    `C_("(graphite)")+H_(2)O_((g)) rarr CO_((g))+H_(2(g))-131.3 kJ`
    D
    `C_("(graphite)")+2S_((s)) rarr CS_(2(l))-91.9 kJ`

  • Which of the following is an exothermic reaction?

    A
    `H_(2(g))+Cl_(2(g)) rarr 2HCl_((g)), DeltaH=-184.6 kJ`
    B
    `N_(2(g))+O_(2(g)) rarr 2NO_((g)), DeltaH=+180.8 kJ`
    C
    `C_("(graphite)")+H_(2)O_((g)) rarr CO_(2)+H_(2(g))-131.4 kJ`
    D
    `C_("(graphite)")+2S_((g))+91.9 kJ rarr CS_(2(l))`

  • Which of the following is an exothermic reaction?

    A
    Conversion of graphite to diamond
    B
    Dehydrogenation of ethane to ethylene
    C
    Combustion of methane
    D
    Decomposition of water

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    Which of the following is not an endothermic reaction

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