- AMelting of ice
- BEvaporation of water
- CHeat of combustion
- ✓Both $(a) $ and $(b)$
Melting of ice and Evaporation of water is show endothermic process
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${\left( {I} \right)}$ ${{C_6}{H_5}COC{H_3}}$
${\left( {II} \right)}$ ${C{H_3}COC{H_3}}$
${\left( {III} \right)}$ ${C{H_3} - CHO}$

$(i)$ $1s^22s^2p^63s^1$ $(ii)$ $1s^22s^22p^64s^1$
Which of the following statements is/are false ?
$(a)$ Energy is required to change $(i)$ to $(ii)$
$(b)$ $(i)$ represents $‘Na’$ atom
$(c)$ $(i)$ and $(ii)$ represent different elements
$(d)$ More energy is required to remove one electron from $(i)$ than $(ii)$
(Enthalpy of neutralisation $=57 \;kJ \;mol ^{-1}$ and Specific heat of water $=4.2\; JK ^{-1} g ^{-1}$ ) (Neglect heat capacity of flask)
