Thermodynamics ...

Direction (Q. Nos. 1-15) This section contains 15 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. 
Assign the sign of work done (based on SI convention) in the following chemical changes taking place against external atmospheric pressure :

For the following process, H₂ (g) → 2 H(g), it absorbs 436 kJ mol^-1. Thus,

Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weighs 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y are

Five moles of an ideal gas at 27° C are allowed to expand isothermally from an initial pressure of 10.0 atm to a final pressure of 4.0 atm against a constant external pressure of 1.0 atm. Thus, work done will be

56 g of iron reacts with dilute H₂SO₄ at 27° C . W ork done (in cals) in

I. closed vessel of fixed volume and
II. an open vessel is

Consider the following properties. 

Select intensive and extensive properties.

Consider the following properties. 

State functions are 

[IITJEE2009]

For an endothermic reaction when ΔH represents the enthalpy of the reaction in kJ mol^-1, the minimum value for the energy of activation will be

[IIT JEE 1992]

One mole of an ideal gas is put through a series of changes as shown in the figure in which 1,2,3 mark the three stages of the system. Pressure at the stages 1, 2, and 3 respectively will be (in bar)

An ideal gas expands in volume from 1 × 10^–3m³ to 1 × 10^–2m³ at 300K against a constant pressure of 1 × 10⁵Nm^–2. The work done is

[AIEEE 2004]

One mole each of CaC₂, AI₄C₃ and Mg₂C₃ reacts with H₂O in separate open flasks at 25° C. Numerical value of the work done by the system is in order

Bond energy of (N— H)bond is x kJ mol^-1 under standard state. Thus, change in internal energy in the following process is

Temperature of one mole of helium gas is increased by 2°. Thus, increase in internal energy is

The internal energy change when a system goes from state A to B is 40kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy?

The density of ice at 0°C is 0.915 g cm^-3 and that of liquid water at 0°C is 1.0 g cm^-3. Work done for melting 1 mole of ice at 1.00 bar is