Chemistry questions
29404 published questions with worked solutions.
- Heat of neutralisation of a strong acid by a strong base is a constant value because, _____
- For an endothermic reaction where H represents the enthalpy of the reaction in kJ/mole, the minimum value for the energy of...
- Theoretical basis of Hess's law is _________ [MH CET 2011]
- C_2H_4 + Cl_2 C_2H_4Cl_2 ; H = -270.6 kJ/mol, S = -139.0 J/K mol. G at 300 K is __________
- For a spontaneous reaction, the G, equilibrium constant (K) and E^ _ cell will be respectively _______
- The values of H and S of a certain reaction are -400 kJ ,mol^ -1 and -20 kJ ,mol^ -1 ,K^ -1 respectively. The temperature below...
- Which of the following values of _f H^ represents that the product is least stable?
- Identify the CORRECT statement regarding a spontaneous process
- Which one of the following bonds has the highest average bond energy (kcal/mol)?
- "The resultant heat change in a reaction is the same whether it takes place in one or several stages." This statement is called...
- Given that: C + O_2 CO_2 ; H^ = -x kJ 2CO + O_2 2CO_2 ; H^ = -y kJ The heat of formation of carbon monoxide will be _________
- The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path...
- For which among the following reactions, change in entropy is less than zero? [MH CET 2015]
- The entropy change for a non-spontaneous reaction is 140 J/K.mole at 298 K. The reaction is ____________
- Given standard enthalpy of formation of CO (-110 kJ/mol) and CO_2 (-394 kJ/mol). The heat of combustion when one mole of graphite...
- If the value of H in a reaction is positive, then the reaction is called __________ [BHU 2002]
- Which law of thermodynamics helps in calculating entropy at different temperatures? [Pb. CET 2003]
- Entropy change of the system and the surroundings in equilibrium __________
- The standard heats of formation for CCl_ 4(g) , H_2O_ (g) , CO_ 2(g) and HCl_ (g) are -25.5, -57.8, -94.1 and -22.1 kcal...
- The entropy change for a certain reaction is 150 J/K.mol. at 298 K. The minimum value of H for the reaction is _______