Thermodynamics Quiz-2

Under which of the following condition is the relation $\Delta H = \Delta \underline{U} + p\Delta V$ valid for a closed system?

Given that the enthalpy of formation of $H_2O$ is -68 kcal $mol^{-1}$, the enthalpy of formation of $OH^-$ ions 2 will be

The bond energies of C - C, C = C, H H and C - H linkages are 350, 600, 400, and 410 kJ per mole respectively. The heat of hydrogenation of ethylene is

Enthalpy of $CH_4+\frac12O_2\longrightarrow CH_3OH$ is negative If enthalpy of combustion of methane and $CH_3OH$ are x and y respectively, then which relation is correct?

If an endothermic reaction occurs spontaneously at constant T and P, then which of the following is true?

Standard entropy of $X_2,Y_2$ and $XY_3$ are 60, 40 and 50 $J K^{-1}\,mol^{-1}$, respectively. For the reaction $\frac12 X_2+\frac32Y_2\longrightarrow XY_3$ $\Delta H=-30\,kJ,$ to be at equilibrium, the temperature will be

For a particular reversible reaction at temperature T, $\Delta H$ and $\Delta S$ were found to be both +ve. If $T_e$ is the temperature at equilibrium, the reaction would be spontaneous when

The incorrect expression among the following is :

A gas present in a cylinder fitted with a frictionless piston expands against a constant pressure of 1 bar from a volume of 2 L to 12 L. In doing so, it absorbs 820 J heat from the surrounding. The change in internal energy during the process is :

An insulated container is divided into two compartments. One compartment contains an ideal gas at a pressure P and temperature T while in the other compartment there is perfect vacuum. If a hole is made in the partition wall, which of the following will be true?