Chemistry Question Bank

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

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:

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:

An ideal gas receives 10 J of heat in a reversible isothermal expansion. Then the work done by the gas:

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?

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

In a reaction, all reactant and products are liquid, then (a) H E (b) H E (c) H E

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?

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?

E is always positive, when

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)

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

Gaseous system is placed with pressure P₁, volume V₁ and  temperature  T1,  it  has  undergone  thermodynamic changes where temperature is remaining constant, it is

In ….. process, work is done at the expense of internal energy.

Based on the first law of thermodynamics, which one of the following is correct?

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

Assertion: A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason: All exothermic reactions are accompanied by decrease in randomness.

Assertion: Entropy of system increases for a spontaneous reaction. Reason: Enthalpy of reaction always not decreases for spontaneous reaction.

Find r S at 320 K for the reaction is:

Assertion: For an isolated system, q is zero. Reason: In an isolated system, change in U and V is zero.

Find rH at 320 K for the reaction is:

Assertion: Addition of Q and w gives ΔU. Reason: Addition of two path functions cannot give state function.

Assertion: The extensive properties of a single pure substance will not only depend upon the number of moles of the substance present but also on any two of the three variables. Reason: Any extensive property if expre…

Assertion: There is no change in internal energy for an ideal gas at constant temperature. Reason: Internal energy of an ideal gas is a function of temperature only.