The total change in the enthalpy of a system is independent of the _______________________?

Related Mcqs:

1. 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

2. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

   A. Δ H = 0 and ΔS = 0
   B. Δ H ≠ 0 and ΔS = 0
   C. Δ H ≠ 0 and ΔS ≠ 0
   D. Δ H = 0 and ΔS ≠ 0

3. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?

   A. Positive
   B. Negative
   C. Zero
   D. Infinity

4. “If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them”. This is ______________ law?

   A. Hess’s
   B. Kirchoff’s
   C. Lavoisier and Laplace
   D. None of these

5. The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________?

   A. Solution
   B. Formation
   C. Dilution
   D. Combustion

6. Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of___________________?

   A. Solution
   B. Vaporisation
   C. Formation
   D. Sublimation

7. For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________?

   A. Cv.dT
   B. Cp.dT
   C. ∫ Cp.dT
   D. ∫ Cv.dT

8. 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

9. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?

   A. T
   B. T and P
   C. T, P and Z
   D. T and Z

10. In the reaction, C + O2 → CO2; ΔH = – 94 kcal. What is the heat content (enthalpy) of O2 ?

    A. -94 kcal
    B. > -94 kcal
    C. < – 94 kcal
    D. Zero