CBSE Class 11 Chemistry Chemical Thermodynamics MCQs.CBSE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.
I. MCQ - Choose Appropriate Alternative
1. The quantity of heat evolved or absorbed during a chemical reaction is called __________. (Heat or Reaction, Heat of Formation, Heat of Combination)
2. An endothermic reaction is one, which occurs __________. (With evolution of heat, With absorption of Heat, In forward Direction)
3. An exothermic reaction is one during which __________. (Heat is liberated, Heat is absorbed, no change of heat occurs)
4. The equation C + O2 → CO2 delta H = -408KJ represents __________ reaction. (Endothermic, Exothermic, Reversible)
5. The equation N2 + O2 → 2NO ΔH = 180KJ represents __________ reaction. (Endothermic, Exothermic, Irreversible)
6. Thermo-chemistry deals with __________. (Thermal Chemistry, Mechanical Energy, Potential Energy)
7. Enthalpy is __________. (Heat content, Internal energy, Potential Energy)
8. Hess’s Law is also known as __________. (Law of conservation of Mass, Law of conservation of Energy, Law of Mass Action)
9. Any thing under examination in the Laboratory is called __________. (Reactant, System, Electrolyte)
10. The environment in which the system is studied in the laboratory is called __________. (Conditions, Surroundings, State)
11. When the bonds being broken are more than those being formed in a chemical reaction, then ΔH will be __________. (Positive, Negative, Zero)
12. When the bond being formed are more than those being broken in a chemical reaction, then the ΔH will be __________. (Positive, Negative, Zero)
13. The enthalpy change when a reaction is completed in single step will be __________ as compared to that when it is completed in more than one steps. (Equal to, Partially different from, Entirely different from)
14. The enthalpy of a system is represent by __________. (H, ΔH, ΔE)
15. The factor E + PV is known as __________. (Heat content, Change in Enthalpy, Work done)
16. Heat of formation is represented by __________. (Δf, ΔHf, Hf)
17. The heat absorbed by the system at constant __________ is completely utilize to increase the internal energy of the system. (Volume, Pressure, Temperature)
18. Heat change at constant __________ from initial to final state is simply equal to the change in enthalpy. (Volume, Pressure, Temperature)
19. A system, which exchange both energy and energy with the surrounding, is __________ system. (Open, Closed, Isolated)
20. A system, which only exchange energy with the surrounding but not the matter, is __________ system. (Open, Closed, Isolated)
II. Fill in the Blank
1. The branch of Chemistry, which deals with the heat changes that take place during chemical reaction, is called __________.
2. The branch of science which deals with energy changes accompanying physical and chemical transformation is called __________.
3. The amount of heat evolved or absorbed in a chemical reaction is called __________.
4. Such reactions in which heat is evolved are called __________ reactions.
5. Such reactions in which heat is absorbed are called __________ reactions.
6. In exothermic reactions, heat evolved is given by __________ sign of DH.
7. In endothermic reactions heat absorbed is given by __________ sign of DH.
8. The total heat change in a reaction is the same whether it takes place in one or several steps.
9. The first law of thermodynamics is also known as __________.
10. The part of universe under observation is called __________.
11. The system plus its surrounding is called __________.
12. Such properties, which give description of a system at a particular moment.
13. The term E + PV is called __________.
14. DH represents change in __________.
15. The temperature of water is raised up when sulphuric acid is added to it. This is an __________ reaction.
16. The characteristic properties of a system which is independent of amount of material concerned is called __________ properties.
17. The characteristic properties of a system which depend on amount of substance present in it is called __________ properties.
18. Density, pressure and temperature are the examples of __________ properties.
19. Mole numbers and enthalpy are the examples of __________ properties.
20. A system, which exchange both energy and matter with its surrounding, is called __________ system.
21. A system, which only exchange energy with the surrounding but not matter is, called __________ system.
22. A system which neither exchange energy nor matter with its surrounding is called __________ system.
23. A system is __________ if it contains only one phase.
24. A system is __________ if it contains more than one phase.
25. 1 kilojoule is equal to __________ joules.
26. 1 Calorie is equal to __________ joules.
27. 1 kilo calorie is equal to __________ joules.
28. The work done (w) is mathematically denoted by __________.
29. The change in enthalpy is denoted by __________.
30. __________ law is used in calculating heat of reaction.
31. __________ is defined as the change in enthalpy when one gram mole of a compound is produced from its element.
32. Heat of formation is denoted by __________.
33. When the work is done on the system by the surrounding the sign of work done (w) is __________.
34. When the work is done by the system on surrounding the sign of work done is __________.
35. First law of Thermodynamics is mathematically represented as __________.
36. Standard enthalpies are measured at __________.
37. Hess’s Law is employed to calculate __________ of a chemical reaction.
38. Heat absorbed by the system at constant volume is completely utilize to increase the __________ of the system.
39. Heat change at constant pressure from initial to final state of the system is simply equal to the __________.
40. SI unit of measurement of heat change is __________.
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