Competition Focus

The number of properties which are state functions among the following is

Pressure, Volume, Temperature, Heat, Work, Entropy, Enthalpy, Free energy, Internal energy.

A gas expands against a constant external pressure so that the work done is $607.8 \mathrm{J}$. The work done in litre atmosphere is

The number of moles of an ideal gas that should be taken in a closed vessel of $30 \mathrm{L}$ capacity at a temperature of  ${27}^{\circ }\mathrm{C}$ so that the pressure exerted by the gas on the walls of the container is $4.1$ atmosphere is

If for a particular reaction, the difference in the heat evolved when the reaction is carried out at constant pressure and that at constant volume at  ${27}^{\circ }\mathrm{C}$  is nearly $5 \mathrm{KJ} {\mathrm{mol}}^{-1}$, then the difference in the number of moles of gaseous reactants and products is

The ratio of ${\mathrm{C}}_{\mathrm{p}}$ value of a triatomic gas to the ${\mathrm{C}}_{\mathrm{v}}$ value of a monatomic gas is

The enthalpy of neutralisation of $0.4 \mathrm{M} {\mathrm{H}}_2{\mathrm{SO}}_4$ will be how many times the enthalpy of neutralisation of  $0.1 \mathrm{M}\hspace{0.17em}\mathrm{HCl} ?$

In a constant volume calorimeter, $3.5 \mathrm{g}$of a gas with molecular weight $28$ was burnt in excess oxygen at $298.0\hspace{0.17em}\mathrm{K}$. The temperature of the calorimeter was found to increase from $298.0 \mathrm{K} \mathrm{to} 298.45 \mathrm{K}$ due to the combustion process. Given that the heat capacity of the calorimeter is $2.5 \mathrm{KJ} {\mathrm{K}}^{-1}$, the numerical value for the enthalpy of combustion of the gas in $\mathrm{KJ} {\mathrm{mol}}^{-1}$ is

One mole of an ideal gas is taken from $\mathrm{a}\to \mathrm{b}$ along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is ${\mathrm{W}}_{\mathrm{s}}$ and that along the dotted line path is ${\mathrm{W}}_{\mathrm{d}}$, then the integer closest to the ratio $\frac{{\mathrm{W}}_{\mathrm{d}}}{{\mathrm{W}}_{\mathrm{s}}}$ is