Consider the following reactions: (i) H^{+}_(aq)+OH^{-}_(aq)\toH_2O_(l),\DeltaH=-X_1kJmol^{-1} (ii) H_{2(g)}+1/2O_{2(g)}\toH_2O_(l),\DeltaH=-X_2kJmol^{-1} (iii) CO_{2(g)}+H_{2(g)}\toCO_(g)+H_2O_(l),\DeltaH=X_3kJmol^{-1} (iv) C_2H_{2(g)}+5/2O_{2(g)}\to2CO_{2(g)}+H_2O_(l),\DeltaH=+X_4kJmol^{-1} Enthalpy of formation of H_2O_(l) is (2007)

Correct Answer is : −X2kJmol−1

Class 11 NEET Chemistry Chemical Thermodynamics

Question : 54 of 96

Marks: +1, -0

Consider the following reactions:

(i) H(aq)++OH(aq)−→H2O(l),ΔH=−X1kJmol−1
(ii) H2(g)+

O2(g)→H2O(l),ΔH=−X2kJmol−1
(iii) CO2(g)+H2(g)→CO(g)+H2O(l),ΔH=X3kJmol−1
(iv) C2H2(g)+

O2(g)→2CO2(g)+H2O(l),ΔH=+X4kJmol−1

Enthalpy of formation of H2O(l) is

(2007)

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