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Thermodynamics deals with
Unit of entropy is
Which of the following is a state function?
Which of the following macroscopic variable is not measurable?
The absolute enthalpy of neutralisation of the reaction: (g) (g) 2(aq) (l) MgO 2HCl MgCl H O → Will be (2005)
The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm–3, respectively. The standard free energy difference ( G ) is equal to 1895 J mol–1, the pressure at which graphite will be transformed into diamon…
Assume each reaction is carried out in an open container. For which reaction will H = E ? (CBSE AIPMT 2006) (a) H (g) Br (g) 2HBr(g) → (b) C(s) 2H O(g) 2H (g) CO (g) → (c) PCl (g) PCl (g) Cl (g) → (d) 2CO(g) O (g) 2CO…
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25 °C increases the temperature of 18.94 kg of water by 0.632 °C. If the specific heat of water at 25 °C is 0.998 cal/g-deg, the value o…
The state of a thermodynamic system is represented by
Thermodynamics is not concerned about____.
Which of the following is a state function and also an extensive property?
If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be (2011)
The entropy change when two moles of ideal monoatomic gas is heated from 200°C to 300°C reversibly and isochorically?
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 :
Which law states that entropy of all pure crystalline solids is zero at absolute zero?
G T S when H
G H when S
G H T S when H S Hence, Correct option is c
Which of the following expressions regarding entropy is not correct? (a) system q S T (b) system total surrounding S S S (c) final initial S S S (d) total system surrounding S S S
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…
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
1 mole of NH₃ gas at 27°C is expanded in reversible adiabatic condition to make volume 8 times (γ = 1.33). Final temperature and work done by the gas respectively are:
One mole of an ideal gas expands reversibly and adiabatically from a temperature of 27°C. If the work done during the process is 3 kJ, then final temperature of the gas is:(CV = 20 J/K)
Unit of entropy is
Which one of the following has S greater than zero? (a) CaO s CO g CaCO s (b) NaCl aq NaCl s (c) NaNO s Na aq NO aq (d) N g 3H g 2NH g