Thermodynamics questions
1906 published questions with worked solutions.
- If at 298 K the bond energies of C-H, C-C, C=C and H-H bonds are respectively 414, 347, 615 and 435 kJ mol^ -1 , the value of...
- For N_2(g)+3H_2(g) 2NH_3(g), H is equal to **[DCE 2007]**
- The relation between H and U is **[K CET 2007]**
- A plot of K against 1/T (abscissa) is expected to be a straight line with intercept on the coordinate axis equal to
- Consider the reaction, 4NO_2(g)+O_2(g) 2N_2O_5(g), _rH = -111 kJ. If N_2O_5(s) is formed instead of N_2O_5(g) in the above...
- Which is the correct expression that relates the change of entropy with the change of pressure for an ideal gas at constant...
- In which reaction will there be an increase in entropy? **[DCE 2009]**
- The heat of combustion of solid benzoic acid at constant volume is -321.30 kJ at 27°C. The heat of combustion at constant...
- Using the following thermochemical equations (i) S(rhombic)+ 32O_2(g) SO_3(g); H=-2x kJ mol^ -1 (ii) SO_2(g)+ 12O_2(g) SO_3(g);...
- Calculate H (in Joules) for C(graphite) C(diamond), from the following data: C(graphite)+O_2(g) CO_2(g); H=-393.5 kJ...
- Average C-H bond energy is 416 kJ mol^ -1 . Which of the following is correct? **[EAMCET 2004]**
- Enthalpy change when 1 g of water is frozen at 0°C is ( H_ fus =1.4354 kcal mol^ -1 ) **[BCECE 2003]**
- Which of the following indicates a heat of reaction equal to the heat of formation? **[OJEE 2006]**
- In a fuel cell methanol is used as fuel and oxygen gas is used as oxidiser. The reaction is CH_3OH(l)+ 32O_2(g) CO_2(g)+2H_2O(l)....
- For the reaction A(g)+B(g) C(g) at 298 K, E = -5 cal and S = -10 cal ,K^ -1 **[AMU 2009]**
- For a chemical reaction, G will always be negative if **[DCE 2009]**
- If an endothermic reaction occurs spontaneously at constant temperature (T) and pressure (p), then which of the following is true?
- For the reaction, 2H_2(g)+O_2(g) 2H_2O(g); H=-573.2 kJ. The heat of decomposition of water per mole is **[MP PET 2003]**
- If the enthalpies of atomisation of methane and ethane are respectively 320 and 560 cal, the bond energy of the C-C bond is
- The bond dissociation energies of H_2, Cl_2 and HCl are 104, 58 and 103 kcal^ -1 respectively. The enthalpy of formation of HCl...
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