Chemistry questions
29404 published questions with worked solutions.
- The enthalpy change for the reaction C_2H_2(g) + 2 1 2 O_2(g) 2CO_2(g) + H_2O(g) is known as enthalpy of
- A solution of 500 ml of 0.2 M KOH and 500 ml of 0.2 M HCl is mixed and stirred; the rise in temperature is T_1. The experiment is...
- In which of the following reaction H is greater than U?
- Heat of transition is the heat evolved or absorbed when a substance is converted from
- The heat changes for the reaction C(s) + 2S(s) CS_2(l) is known as
- One gram atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were...
- Heat of reaction between sodium hydroxide and hydrochloric acid is -57.32 kJ ,mol^ -1 , so heat of dissociation of water is
- Which has maximum calorific value?
- The enthalpy of formation of compounds A, B, C and D are -94.00, +34.00, +7.00 and -12.00 kcal per mole respectively. The correct...
- Heat of fusion is defined as :
- A system absorbs 10 kJ of heat at constant volume and its temperature rises from 27^ C to 37^ C . The value of U is
- Heat of reaction
- Molar heat capacities of vapour and liquid state of a substance are 38.07 and 63.17 JK^ -1 respectively. If the latent heat of...
- Which of the following statements is true? The entropy of the universe
- The standard Gibbs free energy change G^0 is related to equilibrium constant, k_p as
- The entropy of a perfectly crystalline solid at absolute zero is
- Evaluate the entropy change in the vaporization of 36 gm water at 373 K. ( H_ vap = 40.63 kJ ,mol^ -1 )
- At 0 K, the entropy of a perfectly crystalline substance is
- If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then
- S^0 will be highest for the reaction