19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
16g of oxygen gas expands isothermally and reversibly at 300 K from 10 dm3 to 100 dm3. The work done is (in J)
One mole of an ideal gas is initially at 0°C and 1 atm pressure. If it absorbs 1000 cal heat during a reversible isothermal expansion, what will be its final volume?
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
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
In which case change in entropy is negative?
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 :
E is always positive, when
In a reaction, all reactant and products are liquid, then (a) H E (b) H E (c) H E
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:
Based on the first law of thermodynamics, which one of the following is correct?
In ….. process, work is done at the expense of internal energy.
An ideal gas is taken around the cycle ABCA as shown in P-V diagram The net work done by the gas during the cycle is equal to:
An ideal gas receives 10 J of heat in a reversible isothermal expansion. Then the work done by the gas:
The pressure of a gas is 100 kPa. If it is compressed from 1m3 to 10 dm3, find the work done.
Gaseous system is placed with pressure P₁, volume V₁ and temperature T1, it has undergone thermodynamic changes where temperature is remaining constant, it is
U q w , is mathematical expression for
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?
A system absorb 10 kJ of heat at constant volume and its temperature rises from 27°C to 37°C. The value of ∆U is
Two moles of Helium gas undergo a reversible cyclic process as shown in figure. Assuming gas to be ideal. What is the work done for the process C to D?
An ideal gas expands in volume from 1 × 10–3 to 1 × 10–2 m3 at 300 K against a constant pressure 1 × 105 Nm–2. The work done is
A given mass of gas expands from state A to state B by three paths 1, 2, and 3 as shown in the figure: If w ,w and w respectively, be the work done by the gas along three paths, then (a) w w w (b) w w w
The maximum work obtained by an isothermal reversible expansion of 1 mole of an ideal gas at 27°C from 2.24 to 22.4 L is (R = 2 cal)
Calculate the work done when 1 mol of an ideal gas is compressed reversibly from 1 bar to 4 bar at a constant temperature of 300 K
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 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…