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

The heat liberated when 1.89g of benzoic acid is burnt in a bomb calorimeter at 25 °C and it 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- °C, the v…

A reaction having equal energies of activation for forward and reverse reactions has (NEET 2013)

Equal volumes of two monatomic gases, A and B at same temperature and pressure are mixed. The ratio of specific heats (CP/CV) of the mixture will be (2012)

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is (NEET-I 2016)

16g of oxygen gas expands isothermally and reversibly at 300 K from 10 dm3 to 100 dm3. The work done is (in J)

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…

If the bond energies of H–H, Br–Br, and H–Br are 433, 192 and 364 kJ mol–1 respectively, the H for the reaction 2(g) 2(g) (g) H Br 2HBr → is (2004)

Which of the following p-V curve represents maximum work done? (NEET 2022) (a) (b) (c) (d) Ans. (b) Sol. Option (b), represents maximum work done

G H when S

For the reaction, X2O₄(l) → 2XO₂(g) ∆U = 2.1 kcal, ∆S = 20 cal K–1 at 300 K Hence, ∆G is (2014)

Tea placed in thermos flask is an example of

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

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.

Find rH at 320 K for the reaction is:

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.

Assertion: In isothermal process, whole of heat energy supplied to the system is converted into internal energy. Reason: According to the first law of thermodynamics U = q - w

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

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.

U q w , is mathematical expression for

In an isobaric process, when temperature changes from 1T to T , S is equal to

B. P G T 2. T C. P H S 3. -S D. H T P 4. P 5. V