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G H T S when H S Hence, Correct option is c
G T S when H
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…
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
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
105. (∆U – ∆H) for the formation of NH₃ from N₂ and H₂ is :
A reaction has ∆H = – 33 kJ and ∆S = +58 J/K. This reaction would be :
System and surroundings together constitute
Which of the following is a state function?
In which case change in entropy is negative?
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…
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 :
The entropy change when two moles of ideal monoatomic gas is heated from 200°C to 300°C reversibly and isochorically?
Which of the following is not a state function?
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 :
Pick out the wrong statement
Which one of the following is correct? (a) G H T S
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)
In which of the following cases, the reaction is spontaneous at all temperatures ?
Enthalpy change for the reaction, 4H(g) → 2H₂(g) is – 869.5 kJ. The dissociation energy of H–H bond is
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 →
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.
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
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…
Molar heat capacity of water in equilibrium with ice at constant pressure is