List of top Chemistry Questions asked in MHT CET

Calculate the standard enthalpy change of the following reaction: 
\[ \text{CH}_4{}_{\text{(g)}} + 2\text{O}_2{}_{\text{(g)}} \rightarrow \text{CO}_2{}_{\text{(g)}} + 2\text{H}_2\text{O}_{\text{(l)}} \] 
If: 
\[ \Delta_f H^\circ (\text{CH}_4) = -75 \, \text{kJ mol}^{-1} \] \[ \Delta_f H^\circ (\text{CO}_2) = -394 \, \text{kJ mol}^{-1} \] \[ \Delta_f H^\circ (\text{H}_2\text{O}) = -286 \, \text{kJ mol}^{-1} \]

If the standard reduction potential (\( E^\circ \)) of \( \left( \text{Ni}^{2+}_{\text{(aq)}} \mid \text{Ni}_{\text{(s)}} \right) \) and \( \left( \text{Al}^{3+}_{\text{(aq)}} \mid \text{Al}_{\text{(s)}} \right) \) are \( -0.25 \, \text{V} \) and \( -1.66 \, \text{V} \) respectively, then what is the standard emf of the cell reaction? 
 
\[ 2\text{Al}_{\text{(s)}} + 3\text{Ni}^{2+}_{\text{(aq)}} \longrightarrow 2\text{Al}^{3+}_{\text{(aq)}} + 3\text{Ni}_{\text{(s)}} \]