Chemistry Question Bank

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition? (2011)

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32J) (2004)

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be (Mains 2010)

Consider the following processes: ∆H (kJ/mol) 1/2A → B +150 3B → 2C + D –125 E + A → 2D +350 For B + D → E + 2C, ∆H will be (Mains 2011)

The correct option for free expansion of an ideal gas under adiabatic condition is. (NEET 2020)

The enthalpy of vaporisation of a substance is 8400 J mol–1 and its boiling point is –173ºC. The entropy change for vaporisationis :

Which one of the following is not always negative?

In a reaction P + Q → R + S, there is no change in entropy. Enthalpy change for the reaction (∆H) is 12 kJ mol–1. Under what conditions, reaction will have negative value of free energy change?

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:

For the reaction, 2H O g 2H g O g → ∆H = 571.6 KJ fH of water is :

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…

In endothermic reactions,

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

What is the entropy change in JK–1 mol–1 when one mole of ice is converted into water at 0°C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol–1 at 0°C)

Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas? (NEET 2021)

For irreversible expansion of an ideal gas under isothermal condition, the correct option is (NEET 2021)

Entropy is a measure of

Which of the following statements is not correct?

Entropy of the universe is

Which of the following processes is a non-spontaneous process?

The respective examples of extensive and intensive properties are

The statement “The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or several steps” is

In thermodynamics a process is called reversible when

In an adiabatic expansion of ideal gas

When ice melts into water, entropy