Chemistry Question Bank

If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be (2011)

In endothermic reactions,

The following two reactions are known Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g); ∆H = –26.8 kJ FeO(s) + CO(g) → Fe(s) + CO₂(g); ∆H = – 16.5 kJ The value of ∆H for the following reaction Fe₂O₃(s) + CO(g) → 2FeO(s) + CO₂(g) …

Identify the correct statement for change of Gibbs’ energy for a system system ( G ) at constant temperature and pressure. (2006)

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)

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?

Which law states that entropy of all pure crystalline solids is zero at absolute zero?

The standard free energy change  G  is related to K (equilibrium constant) as

Identify the correct statement regarding entropy.

Which of the following macroscopic variable is not measurable?

Which of the following statements is not correct?

Thermodynamically, the most stable form of carbon

In which case change in entropy is negative? (NEET 2019)

The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25 °C 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-deg, the value o…

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)

For a reaction: X → Y + Z absolute entropies are X = 120 JK–1 mol–1 Y = 213.8 JK–1 mol–1 and Z = 197.9 JK–1 mol–1. What will be the entropy change at 298 K and 1 atm?

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

Which of the following statements is correct for the spontaneous adsorption of a gas? (2014)

Which of the following reactions define o f G ? (a) diamond C O g CO g → (b) H g F g HF g → (c) H P O H O 2H PO → (d) SO g O g SO g →

H and E  for the reaction, Fe O s 3H g 2Fe s H O l → at constant temperature are related as (a) H E (b) H E RT (c) H E RT (d) H E 3RT

The enthalpy of vaporisation of a compound AB at its boiling point (127°C) is 6.4 kJ mol-1. Its entropy of vaporization is

G is the net energy available to do useful work and is a measure of free energy. If a reaction has positive enthalpy change and positive entropy change, under what conditions will the reaction be spontaneous?

2 moles of ideal gas at 27°C temperature is expanded reversibly from 2 lit. to 20 lit. find entropy change. (R = 2 cal/mol K)

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)