Chemistry questions
29404 published questions with worked solutions.
- The enthalpy of vaporisation of water is 186.5 J ,mol^ -1 , the entropy of its vaporisation will be
- According to the 3rd law of thermodynamics, which one of the following quantities for a perfectly crystalline solid is zero at...
- The law formulated by Nernst is
- For a reaction R_1, G = x kJ ,mol^ -1 . For a reaction R_2, G = y kJ ,mol^ -1 . Reaction R_1 is non-spontaneous but along with...
- For the reaction 2Cl(g) Cl_2(g) the sign of H and S respectively are
- On combustion, carbon forms two oxides CO and CO_2 . Heat of formation of CO_2 is 94.3 kcal and that of CO is 26.0 kcal. Heat of...
- Gibb's Helmholtz equation is
- At 27^ C latent heat of fusion of a compound is 2930 J/mol. Entropy change is
- The heat of combustion of yellow P and red P are -9.91 kJ and -8.81 kJ respectively. The heat of transition of yellow to red...
- For the A B process. Given : H = +ve, S = -ve, T S > H. Which of the following is correct?
- The heat of solution of anhydrous CuSO_4 and CuSO_4.5H_2O are -15.89 and 2.80 kcal ,mol^ -1 respectively. Heat of hydration of...
- Which of the following process proceeds with the +ve value of S?
- In which of the following case does entropy decrease?
- At 373 K, the heat of transition for H_2O(l) H_2O(g) is H = 37.3 kJ ,mol^ -1 . The entropy change corresponding to the reaction is
- A chemical reaction will be spontaneous if it is accompanied by a decrease of
- If 900 J/g of heat is exchanged at boiling point of water, then what is increase in entropy?
- For a reaction Ag_2O(s) 2Ag(s) + 1 2 O_2(g) the entropy and enthalpy change are respectively 60 JK^ -1 and 30 kJ. The given...
- For a reversible isothermal process in equilibrium, the entropy change is given by the expression
- If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :
- Mathematically, Gibb's free energy (G) is defined by the following relation :