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MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

G H T S when H S Hence, Correct option is c

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

G T S  when H

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Read the following statements regarding spontaneity of a process and mark the appropriate choice. (i)   When enthalpy factor is absent then randomness factor decides spontaneity of a process. (ii) When randomness fact…

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

It is impossible for a reaction to take place if (a) H is +ve and  S  is +ve (b) H is –ve and  S  is +ve (c) H is +ve and  S  is –ve (d) H is –ve and  S  is –ve

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Considering entropy (s) as a thermodynamic parameter, the criterion for the spontaneity of any process is (a) system surroundings S S (b) system surroundings S S (c) system S 0 only (d) surroundings S 0only

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

105. (∆U – ∆H) for the formation of NH₃ from N₂ and H₂ is :

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

A reaction has ∆H = – 33 kJ and ∆S = +58 J/K. This reaction would be :

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

System and surroundings together constitute

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Which of the following is a state function?

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

In which case change in entropy is negative?

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

One mole of an ideal diatomic gas (Cv = 5 cal) was transformed from initial 25°C and 1 L to the state when temperature is 100°C and volume 10 L. The entropy change of the process can be expressed as (R = 2 calories/mo…

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

When one mole of an ideal gas is compressed to half of its initial volume and simultaneously heated to twice its initial temperature, the change in entropy of gas (∆S) is :

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

The entropy change when two moles of ideal monoatomic gas is heated from 200°C to 300°C reversibly and isochorically?

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Which of the following is not a state function?

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

The following data is known about the melting of a compound AB. ∆H = 9.2 kJ mol–1. ∆S = 0.008 kJ K–1mol–1. Its melting point is :

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Pick out the wrong statement

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Which one of the following is correct? (a) G H T S

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

2 moles of ideal gas at 27°C temperature is expanded reversibly from 2 lit. to 20 lit. find entropy change. (R = 2 cal/mol K)

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

In which of the following cases, the reaction is spontaneous at all temperatures ?

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Enthalpy change for the reaction, 4H(g)  → 2H₂(g) is – 869.5 kJ. The dissociation energy of H–H bond is

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Which of the following reactions define o f G ? (a) diamond C O g CO g → (b) H g F g HF g → (c) H P O H O 2H PO → (d) SO g O g SO g →

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Calculate the work done when 1 mole of an ideal gas is compressed reversibly form 1 bar to 4 bar at a constant temperature of 300 K.

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

The work done during the expansion of a gas from a volume of 4dm3 to 6 dm3 against a constant external pressure of 3 atm is

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm–3, respectively. If the standard free energy difference is equal to 1895 J mol–1, the pressure at which graphite will be transformed into diamond a…

MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryThermodynamics and Thermochemistry

Molar heat capacity of water in equilibrium with ice at constant pressure is

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