Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 April 2014)

done JEE Main Paper (Held On 12 April 2014)

• question_answer1) The $\left( S{}^\circ \right)$ of the following substances are: $C{{H}_{4}}(g)186.2J{{K}^{-1}}mo{{l}^{-1}}$ ${{O}_{2}}(g)205.2J{{K}^{-1}}mo{{l}^{-1}}$ ${{H}_{2}}O(g)69.9J{{K}^{-1}}mo{{l}^{-1}}$ The entropy change $(\Delta {{S}^{o}})$for the reaction : $C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)$is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )

A) $-312.5J{{K}^{-1}}mo{{l}^{-1}}$

B) $-242.8J{{K}^{-1}}mo{{l}^{-1}}$

C) $-108.1J{{K}^{-1}}mo{{l}^{-1}}$

D) $-37.6J{{K}^{-1}}mo{{l}^{-1}}$

• question_answer2) The standard enthalpy of formation $({{\Delta }_{f}}{{H}^{o}}_{298})$for methane, $C{{H}_{4}}$is$-74.9kJ\,mo{{l}^{-1}}.$In order to calculate the average energy given out in the formation of a C ? H bond from this it is necessary to know which one of the following?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )

A) The dissociation energy of the hydrogen molecule, ${{H}_{2}}$.

B) The first four ionisation energies of carbon.

C) The dissociation energy of ${{H}_{2}}$and enthalpy and sublimation of carbon (graphite).

D) The first four ionisation energies of carbon and electron affinity of hydrogen.

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