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Standard XII

Chemistry

Heat of Reaction

Heat of disso...

Question

Heat of dissociation for $H_{2} O$ in $H^{+}$ and $O H^{-}$ ions is :

-57.27 kJ/mol

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+57.27 kJ/mol

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-50 kJ/mol

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+50 kJ/mol

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Solution

The correct option is B +57.27 kJ/mol
Heat of neutralisation :

$H^{+} + O H^{-} ⟶ H_{2} O; Δ H = - 13.7 \times 4.18 k J = - 57.27 k J$
Heat of dissociation of $H_{2} O$ into $H^{+}$ and $O H^{-}$ will be positive.

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Heat of dissociation for H2O in H+ and OH− ions is :

The correct option is B +57.27 kJ/molHeat of neutralisation :H++OH−⟶H2O;ΔH=−13.7×4.18kJ=−57.27 kJHeat of dissociation of H2O into H+ and OH− will be positive.

Heat of dissociation for $H_{2} O$ in $H^{+}$ and $O H^{-}$ ions is :

The correct option is B +57.27 kJ/mol
Heat of neutralisation :

$H^{+} + O H^{-} ⟶ H_{2} O; Δ H = - 13.7 \times 4.18 k J = - 57.27 k J$
Heat of dissociation of $H_{2} O$ into $H^{+}$ and $O H^{-}$ will be positive.