Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?

Related Mcqs:

1. The amount of heat required to decompose a compound into its elements is _____________ the heat of formation of that compound from its elements?

   A. Less than
   B. More than
   C. Same as
   D. Not related to

2. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?

   A. Fusion
   B. Vaporisation
   C. Transition
   D. None of these

3. “The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements.” This is the statement of___________________?

   A. Law of Petit and Dulong
   B. Kopp’s rule
   C. Nernst heat theorem
   D. Trouton’s rule

4. Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?

   A. Vapor to liquid
   B. Vapor to solid
   C. Solid to liquid
   D. One allotropic form to another allotropic form

5. Compound having large heat of formation is_____________________?

   A. More stable
   B. Less stable
   C. Not at all stable (like nascent O2)
   D. Either more or less stable; depends on the compound

6. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?

   A. CO2
   B. CH4
   C. CO
   D. H2

7. In the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?

   A. Increase
   B. Decrease
   C. Not alter
   D. None of these

8. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?

   A. 100,000 kW
   B. 160,000 kW
   C. 200,000 kW
   D. 320,000 kW

9. Heat of formation of an element in its standard state is___________________?

   A. 0
   B. 0
   D. A function of pressure

10. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?

    A. Sublimation
    B. Fusion
    C. Transition
    D. Vaporisation