19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
G is the net energy available to do useful work and is a measure of free energy. If a reaction has positive enthalpy change and positive entropy change, under what conditions will the reaction be spontaneous?
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)
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 →
System and surroundings together constitute
Thermodynamics is not concerned about____.
Gaseous system is placed with pressure P₁, volume V₁ and temperature T1, it has undergone thermodynamic changes where temperature is remaining constant, it is
The state of a thermodynamic system is represented by
Which of the following is an example of open system?
According to the first law of thermodynamics, U q w . In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?
In a reaction, all reactant and products are liquid, then (a) H E (b) H E (c) H E
H and E for the reaction, Fe O s 3H g 2Fe s H O l → at constant temperature are related as (a) H E (b) H E RT (c) H E RT (d) H E 3RT
For the gas phase reaction, PCl g PCl g Cl g Which of the following conditions are correct?
Which of the following macroscopic variable is not measurable?
A sample of liquid in a thermally insulated container (a calorimeter) is stirred by a motor. Taking liquid as a system for this process choose the appropriate option:
Closed system can exchange (with surroundings)
Which of the following is true about isolated system?
Which of the following is a state function?
The heat of formation of Fe O s is –824.2 kJ mol–1. ∆H for the reaction. 2Fe O s 4Fe s 3O g → is:
The absolute enthalpy of neutralisation of the reaction: (g) (g) 2(aq) (l) MgO 2HCl MgCl H O → Will be (2005)
The enthalpy of vaporisation of a compound AB at its boiling point (127°C) is 6.4 kJ mol-1. Its entropy of vaporization is
Thermodynamics deals with
Which of the following is not a state function?
Which of the following is not an intensive property?
Enthalpy change for the reaction, 4H(g) 2H (g) → is – 869.6 kJ. The dissociation energy of H–H bond is (CBSE AIPMT 2011)
Which of the following is a path function?