Gaseous - Thermodynamic - Thermochemistry - Chemistry MCQ

At what temperature the RMS velocity of SO₂ be same as that of O₂ at 303 K           

An ideal gas obeying kinetic theory of gases can be liquefied if:           

For the process
H₂O(l) → H₂O(g)
At T = 100°C and 1 atmosphere pressure, the correct choice is:

One mole of a monoatomic ideal gas expands adiabatically at initial temperature T against a constant external pressure of 1 atm from 1L to 3L. The final temperature of the gas is:           

The enthalpies of combustion of carbon and carbon monoxide are –393.5 and –283 kJ mol^–1, respectively. The enthalpy of formation of carbon monoxide per mole is:           

The Maxwell's relationship derived from the equation dG = VdP – SdT is:

For a closed system consisting of a reaction N₂O₄(g) → 2NO₂(g), the pressure:           

One mole of an ideal gas is put through a series of changes as shown in the graph in which A, B, C mark the three stages of system. Calculate the pressure at three stages of the system & provide the sum value (P_A + P_B + P_C)

 

If at 298 K the bond energies of C—H, C—C, C=C and H—H are, respectively, 414, 347, 615 and 435 kJ mol^–1, the value of enthalpy change for the reaction CH₂=CH₂(g) + H₂(g) → H₃C—CH₃(g) at 298 K will be:           

2 mole 'He' is mixed with 2gm of H₂. The molar heat capacity at constant pressure for mixture is:

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If T_i is the initial temperature and T_f is the final temperature, which of the following statement is correct:

An inventor claims to have constructed an engine that has an efficiency of 75% when operated between the boiling and freezing points of water. Which of the following is true?           

If C₁, C₂, C₃........ represent the speeds of n₁, n₂, n₃....... molecules, then the root mean square speed is:

A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?​

0.5 mole of each of H₂, SO₂ and CH₄ are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressures in the container will be:           

Volume of air that will be expelled from a vessel of 300 cm³ when it is heated from 27^oC o 37^oC at the same pressure will be            

Two separate bulbs contain ideal gases A and B. The density of gas A is twice that of gas B. The molecular mass of A is half that of gas B. The two gases are at the same temperature. The ratio of the pressure of A to that of gas B is:           

The molar entropy of crystalline CO at absolute zero is:           

The plot that describes a Carnot cycle is:

The rate of evaporation of a liquid is always faster at a higher temperature because:           

For the process,
1 Ar (300 K, 1 bar) → 1Ar (200 K, 10 bar) assuming ideal gas behaviour, the change in molar entropy is: 

For the reaction, N₂(g) + 3H₂(g) → 2NH₃(g)
​Compute the entropy change (in J/K/mol) for the process and comment on the sign of the property.

For the reaction,
2Cl(g) → Cl₂(g)
The thermodynamic properties

The standard enthalpies of formation of CO₂(g), H₂O(l) and glucose(s) at 25°C are –400 kJ mol^–1,
–300 kJ mol^–1 and –1300 kJ mol^–1, respectively. The standard enthalpy of combustion per gram of glucose at 25°C is:

For an ideal gas, which of the following is true:

Assuming that water vapour is an ideal gas, the internal energy change (∆U) when 1 mol of water is vaporized at 1 bar pressure and 100°C will be (given that molar enthalpy of vaporisation of water at 1 bar and 373 K is 41 kJ mol^–1 K^–1)           

For a system of constant composition, the pressure (P) is given by: