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60 Days Revision Plan || Thermodynamics and Thermochemistry Quiz

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Question 1

A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A:

Question 2

When 1 mole of CO2(g) occupying volume 10L at 27 °C is expanded under adiabatic condition, temperature falls to 150 K, Hence, final volume (in Litres)is(here use γ = 1.33 for CO2 )

Question 3

For the reaction
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O) (l)
at constant temperature, ΔH - ΔE is

Question 4

A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following:

Question 5

A reaction is non-spontaneous at the freezing point of water but is spontaneous at the boiling point of water then ΔH and ΔS should be 

Question 6

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.00C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be:
(R = 8.314 J/mol K) (n 7.5 = 2.01)

Question 7

The entropy change involved in the isothermal reversible expansion of 2 mole of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27 °C is:

Question 8

In a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
CH3OH(l) + 3/2O2(g) CO2(g) + 2H2O(l)
At 298 K, standard Gibb’s energies of formation for CH3OH(l), H2O(l) and CO2(g) are –166.2, –237.2 and –394.4 kJ mol–1 respectively. If standard enthalpy of combustion of methanol is –726 kJ mol–1, efficiency of the fuel cell will be:

Question 9

If at 298K, the bond energies of C–H, C–C, C=C and H–H bonds are respectively 414, 347, 615 and 435 kJ mol-1, the value of enthalpy change for the reaction
at 298 will be

Question 10

Which among the following factors is most important in making fluorine the strongest oxidizing halogen?

Question 11

If ∆Hf (H2O) is -286.20 kJ mol-1, then ∆ (OH-) is

Question 12

1 mole of gas occupying 3 L volume is expanded against a constant external pressure of 1 atm to a volume of 15 L. The work done by a system is equal to

Question 13

For complete combustion of ethanol, C2H5OH (l) + 3O2(g) 2CO2(g) + 3H2O (l), the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ mol-1 at 25 °C. Assuming ideality the Enthalpy of combustion, ΔcH, for the reaction will be: (R = 8.314 kJ mol–1)

Question 14

Assuming that water vapour is an ideal gas, the internal energy change (ΔU) when 1 mole of water is vapourised at 1 bar pressure and 100 °c, (Given: Molar enthalpy of vapourisation of water at 1 bar and 373 K = 41 kJ mol–1 and R = 8.3 J mol–1 K–1) will be:

Question 15

The following reaction is performed at 298 K
2NO(g) + 02(g) 2NO2(g)
The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO2(g) at 298 K ? (KP = 1.6 x 1012)
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Nov 11JEE & BITSAT