The heat change for the reaction, C(s) + 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of_________________?

Related Mcqs:

1. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is________________?

   A. H2O > C2H5OH > CS2
   B. CS2 > C2H5OH > H2O
   C. H2O > CS2 > C2H5OH
   D. CS2 > H2O > C2H5OH

2. The heat evolved in the combustion of benzene is represented by the equation: C6H6 + 7.5 O2 = 6CO2 + 3H2O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C6H6 is burnt in an open container, will be _____________ kJ/kgmole?

   A. +816.15
   B. +1632.3
   C. -1632.3
   D. -2448.45

3. For a reaction, X → Y, if the concentration of ‘X’ is tripled; the rate becomes nine times. The order of reaction is__________________?

   A. 0
   B. 1
   C. 2
   D. 3

4. Enthalpy of formation of NH3 is – 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to _____________ kJ/kg. mole?

   A. 46
   B. 92
   C. -23
   D. -92

5. Heat of reaction is a function of the___________________?

   A. Pressure
   B. Temperature
   C. Both A. & B.
   D. Neither A. nor B.

6. Heat of reaction is not influenced by__________________?

   A. The route/method through which final products are obtained
   B. The physical state (e.g., solid, liquid or gaseous) of reactants and products
   C. Whether the reaction is carried out at constant temperature or constant pressure
   D. None of these

7. ______________ equation gives the effect of temperature on heat of reaction ?

   A. Kirchoff’s
   B. Maxwell’s
   C. Antoine
   D. Kistyakowsky

8. As per Kirchhoff s equation, the heat of reaction is affected by the__________________?

   A. Pressure
   B. Volume
   C. Temperature
   D. Molecularity

9. During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?

   A. Enthalpy
   B. Gibbs free energy
   C. Internal energy
   D. Entropy

10. Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

    A. Mixing
    B. Adsorption
    C. Wetting
    D. Complete wetting