Consider the following reactions: (a) {\H}_{( {\aq})}^{+}+ {\OH}_{( {\aq})}^{-}= {\H}_2 {\O}_{( {\I})}, ∆ {\H}=- {\X}_1 {\kJ} {\mol} {\m}^{-1} (b) {\H}_{2( {\g})}+\frac{1}{2} {\O}_{2( {\g})}= {\H}_2 {\O}_{(1)}, ∆ {\H}=- {\X}_2 {\kJ} {\mol}^{-1} (c) {\CO}_{2(g)}+ {\H}_{2( {\g})}= {\CO}_{(g)}+ {\H}_2 {\O}_{(0)}- {\X}_3 {\kJ} {\mol}^{-1} (d) {\C}_2 {\H}_{2(\xi)}+\frac{5}{2} {\O}_{2(\xi)}=2 {\CO}_{2(\xi)}+ {\H}_2 {\O}_{(0)}+ {\X}_4 {\kJ} {\mol}^{-1}

Correct Answer is : −X2kJmol−1

AIPMT 2007 Physics and Chemistry Paper

Question : 62 of 100

Marks: +1, -0

Consider the following reactions: (a) H(aq)++OH(aq)−=H2O(I),∆H=−X1‌kJ‌mol‌m−1 (b) H2(g)+‌

O2(g)=H2O(1),∆H=−X2‌kJ‌mol−1 (c) CO2(g)+H2(g)=CO(g)+H2O(0)−X3‌kJ‌mol−1 (d) C2H2(ξ)+‌

O2(ξ)=2CO2(ξ)+H2O(0)+X4‌kJ‌mol−1

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