BITSAT 2021 | Thermodynamics Question 7 | Chemistry

For the complete combustion of ethanol, $${C_2}{H_5}OH(I) + 3{O_2}(g) \to 2C{O_2}(g) + 3{H_2}O(I)$$, the amount of heat produced as measured in bomb calorimeter is 1364.47 kJ mol^$$-$$1 at 25$$^\circ$$C. Assuming ideality the enthalpy of combustion, $$\Delta$$H_C, for the reaction will be (R = 8.314 JK^$$-$$1 mol^$$-$$1)

$$-$$ 1366.95 kJ mol^$$-$$1

$$-$$1361.95 kJ mol^$$-$$1

$$-$$ 1460.50 kJ mol^$$-$$1

$$-$$ 1350.50 kJ mol^$$-$$1

BITSAT 2021

MCQ (Single Correct Answer)

-1

The incorrect expression among the following is

$${{\Delta {G_{system}}} \over {\Delta {S_{total}}}} = - T$$

$${W_{reversible}} = - nRT\ln {{{V_f}} \over {{V_t}}}$$

$$\ln K = {{\Delta H^\circ - T\Delta S^\circ } \over {RT}}$$

$$K = {e^{ - \Delta G^\circ /RT}}$$

BITSAT 2020

MCQ (Single Correct Answer)

-1

Which of the following statement is correct?

$$\Delta$$S for $${1 \over 2}$$Cl₂(g) $$\to$$ Cl(g) is positive.

$$\Delta$$E < 0 for combustion of CH₄(g) in a sealed container with rigid adiabatic system.

$$\Delta$$G is always zero for a reversible process in a closed system.

$$\Delta$$G$$^\circ$$ for an ideal gas reaction is a function of pressure.

BITSAT 2020

MCQ (Single Correct Answer)

-1

At the top of a mountain the thermometer reads 0$$^\circ$$C and the barometer reads 710 mm Hg. At the bottom of the mountain the temperature is 30$$^\circ$$C and the pressure is 760 mm Hg. The ratio of the density of air at the top to that of the bottom is

1 : 1.04

0.4 : 1

1.04 : 1

1 : 04

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