| 1 |
The change in heat energy of a chemical reaction at constant temperature and pressure is called |
- A. Enthalpy change
- B. Bond energy
- C. Heat of sublimation
- D. Internal energy change
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| 2 |
For a given process, the heat chagnes of constant pressure and at constant volume are related to each other as. |
- A. qp= qv
- B. qp<qv
- C. qp>qv
- D. None of these
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| 3 |
The heat contents of the system of known as. |
- A. Entropy
- B. Enthalpy
- C. Work
- D. Free energy
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| 4 |
Which of the following statement is contrary to the first law of thermodynamics |
- A. An equivalent amount of heart energy can neither be created nor destroyed
- B. One form of energy can be transferred into an equivalent amount of other kinds of energy
- C. In an adiabatic process, the work done is independent of its path
- D. Continuous production of mechanical work without supplying an equivalent is amount of heat possible
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| 5 |
A material or a collection of materials which is under study is called |
- A. State function
- B. Degree and joule
- C. Degree and ergs
- D. Calorie and joule
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| 6 |
In endothermic reactions, the heat content of the |
- A. Products is more then that of reactants
- B. Reactants is more than that of products
- C. Both a and b
- D. Reactant and products is equal
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| 7 |
Which of the following value of heat of formation indicates that the product is least stable. |
- A. -94 KJ
- B. -231.6 KJ
- C. +21.4 KJ
- D. +70 KJ
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| 8 |
The optimum temperature for the synthesis of NH3 by Haber's process is. |
- A. 200 <sup>o</sup>C
- B. 300 <sup>o</sup>C
- C. 400 <sup>o</sup>C
- D. 500 <sup>o</sup>C
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| 9 |
One of the following statements about Born-Haber cycle is correct. Which is that statement |
- A. Born-Haber cycle is different from Hess's law
- B. The energy change in a cyclic process is not zero
- C. The lattice energy of the crystalline substances can be calculated easily
- D. Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously
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| 10 |
A chemical change always involve |
- A. Absorption of heat
- B. Evolution of heat
- C. Either absorption or evolution of heat
- D. The liberation of heat and light energy
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