Chemistry questions
29404 published questions with worked solutions.
- The heats of neutralisation of CH_3-COOH , H-COOH , HCN and H_2S are -13.2, -13.4, -2.9 and -3.8 kcal/equivalent respectively....
- 2 moles of an ideal gas at 27 ^ is expanded reversibly from 2 litre to 20 litre. Find entropy change. (R = 2 cal/mol.K)
- Standard entropy for X_2 , Y_2 and XY_3 are 60, 40 and 50 J/K respectively. For the reaction 12 X_2 + 32 Y_2 XY_3 , H = -30 kJ,...
- Compounds with high heat of formation are less stable because ___________ [KCET 2002]
- S + 32 O_2 SO_3 + 2x kcal SO_2 + 12 O_2 SO_3 + y kcal Find out the heat of formation of SO_2
- The enthalpy change ( H) for the process N_2H_ 4(g) 2N_ (g) + 4H_ (g) is 1724 kJ ,mol^ -1 . If the bond energy of N - H bond in...
- Which of the following is NOT a state function? [AIIMS 2001, MH CET 2004]
- The heat change at constant volume for the decomposition of silver oxide is found to be 30.66 kJ. The heat change at constant...
- One mole of water at 100 ^ is converted into steam at 100 ^ at a constant pressure of 1 atm. The change in entropy is __________....
- H_ 2(g) + 12 O_ 2(g) H_2O_ (l) ; H_ 298 ,K = -68.32 kcal. Heat of vapourisation of water at 1 atm and 25 ^ is 10.52 kcal. The...
- The heat of neutralization of HCl by NaOH under certain condition is -55.9 kJ and that of HCN by NaOH is -12.1 kJ. The heat of...
- The bond dissociation energy of gaseous H_2 , Cl_2 and HCl are 104, 58 and 103 kcal/mole respectively. Enthalpy of formation of...
- The entropy of a perfectly crystalline solid at absolute zero is _______ [AMU 2000]
- The heat evolved during the combination of 24 g C and 128 g S following the change is _______. C + S_2 CS_2 ; H = 22.0 kcal
- The standard enthalpy of formation ( _fH^ ) at 298 K for methane, CH_ 4(g) is -74.8 kJ/mol. The additional information required...
- The difference between heat of reaction and change in internal energy at constant volume for the reaction given below at 25 ^ in...
- For the reaction X_2Y_ 4(l) 2XY_ 2(g) at 300 K the values of U and S are 2 kCal and 20 Cal K^ -1 respectively. The value of G for...
- When 50 cm^3 of 0.2 N H_2SO_4 is mixed with 50 cm^3 of 1 N KOH, the heat liberated is __________. (heat of neutralization = 57.32...
- The enthalpy change for a reaction does NOT depend upon the _______
- Which of the following does NOT result in increase in the entropy?