Thermo-Chemistry Online Mcqs Test

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Question 1

1. The branch of chemistry which deals with thermal energy change in chemical reaction is called

Answer

Chemical kinetics

Answer

Thermodynamics

Answer

Thermochemistry

Question 2

2. Choose the S.I units for molar heat capacity among the following

Answer

Joule deg¯¹ atom¯¹

Answer

Joule deg¯¹ mol¯¹

Answer

Joule cm¯¹ deg¯¹

Answer

Joule deg¯¹ Kg¯¹

Question 3

3. Reaction in which heat is evolved

Answer

Non-spontaneous

Answer

Spontaneous

Answer

Endothermic

Answer

Exothermic

Question 4

4. The S.I unit of heat and energy is

Answer

None of these

Question 5

5. Two fundamental ways to transfer energy are

Answer

Heat and work

Answer

Heat and volume

Answer

Pressure and temperature

Answer

Pressure and volume

Question 6

6. The ∆H values for reaction C + ½ O₂ → CO and CO + ½ O₂ → CO₂ are 100 and 200 kJ respectively. The heat of reaction for C + O₂ → CO₂ will be

Question 7

7. A material or a collection of materials which is under study is called

Answer

Any substance

Answer

State function

Answer

Surrounding

Question 8

8. If internal energy of the system is increased

Answer

Temperature of the system may rise

Answer

Change in state of the system is increased

Answer

Chemical reaction may take place

Question 9

9. When enthalpy of reactants is higher than product then reaction will be

Answer

Endothermic

Answer

Non-spontaneous

Answer

Spontaneous

Answer

Exothermic

Question 10

10. An adiabatic expansion of an ideal gas always has

Answer

Decrease in temperature

Question 11

11. A mixture of ice and water contains 60 g of ice and water. If 60 J of heat energy is removed from this mixture, some of the

Answer

Water will freeze

Answer

Water will vaporize

Answer

Ice will sublime

Answer

Ice will melt

Question 12

12. Form the above data, the standard heat of formation of KOH in kcal mol¯¹ is

Answer

– 68 + 48 – 14

Answer

– 68 – 48 + 14

Answer

68 – 48 + 14

Answer

68 + 48 + 14

Question 13

13. Which type of reactions cannot occur spontaneously?

Answer

Endothermic

Answer

Both a and b

Answer

Exothermic

Question 14

14. For the reaction NaOH + HCl → NaCl + H₂O the change in enthalpy is called

Answer

Heat of neutralization

Answer

Heat of combustion

Answer

Heat of sublimation

Answer

Heat of reaction

Question 15

15. A particular reaction has a negative value for the energy change. Then at ordinary temperature

Answer

It has small + ve value for enthalpy change

Answer

It has a large + ve value for enthalpy change

Answer

It has a + ve value for the entropy change and a – ve value for the enthalpy change

Answer

It has a large – ve value for the entropy change

Question 16

16. The law of thermodynamics that provides the basis for the determination of absolute entropy of substance is

Answer

Second law

Answer

Zeroth law

Question 17

17. Total energy of a system is

Answer

P.E + mechanical energy

Answer

K.E + heat energy

Answer

P.E + heat energy

Question 18

18. The branch of science which deals with energy transformation is known as

Answer

Thermodynamics

Answer

Thermochemistry

Answer

Photochemistry

Question 19

19. ______ is the study about energy of a chemical system

Answer

Stoichiometry

Answer

Thermochemistry

Answer

Thermodynamics

Question 20

20. In order to decompose 9 g of water 142.5 kJ of heat is required. Hence enthalpy of formation of water is

Question 21

21. The amount of heat which is involved during the completion of a chemical reaction at 25°C and 1 atmospheric pressure is called

Answer

Enthalpy of reaction

Answer

Heat of neutralization

Answer

Hat of formation

Answer

Heat of combustion

Question 22

22. All of the following are state function except

Question 23

23. Which law among the following has same net change whether it takes place directly or indirectly?

Answer

Boyle’s law

Answer

Henry’s law

Answer

Graham’s law

Answer

Hess’s law

Question 24

24. Most of the thermodynamic parameters are

Answer

Surrounding

Answer

State function

Question 25

25. The enthalpies of combustion of carbon and carbon monoxide are -383.5 and -283 kJ mol¯¹ respectively. The enthalpy of formation of carbon monoxide per mole is

Question 26

26. If coefficients of a chemical equation are doubled, the enthalpy change will

Answer

Not change

Answer

None of these

Question 27

27. In thermodynamics which one of the following is not an intensive property?

Answer

Temperature

Question 28

28. The bond dissociation energies of H₂, CL₂ and HCl are 104, 58 and 103 kcal respectively. The enthalpy of formation of HCl gas will be

Question 29

29. When enthalpy and entropy change for a chemical reaction are – 2.5 x 10³ cals and 7.4 cals deg¯¹ respectively. Predict that reaction at 298 K is

Answer

Irreversible

Answer

Non-spontaneous

Answer

Reversible

Answer

Spontaneous

Question 30

30. Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64kJ mol¯¹ and -145.6kJ¯¹ mol¯¹ respectively. Standard Gibbs energy change for the same reaction at 298 K is

Answer

-523.3 kJ mol¯¹

Answer

-221.1 kJ mol¯¹

Answer

-439.3 kJ mol¯¹

Answer

-339.3 kJ mol¯¹

Question 31

31. Unit of heat is SI system is

Question 32

32. One of the statement about Born Haber cycle is correct. Which is that statement?

Answer

The lattice energy of the crystalline substances can be calculated easily

Answer

The energy change in a cyclic process is not zero

Answer

Heat of formation of the product and lattice energy of the substance can be calculated simultaneously

Answer

Born Haber cycle is different from Hess’s law

Question 33

33. In measurement of melting point of solid, the leaker used will be

Answer

Surrounding

Question 34

34. The net change in energy in a chemical reaction is same whether it takes place directly or indirectly is

Answer

Hess’s law

Answer

Henry’s law

Answer

Graham’s law

Answer

Charles’s law

Question 35

35. Two fundamental ways to transfer energy are

Answer

Pressure and volume

Answer

Pressure and temperature

Answer

Heat and work

Answer

Heat and volume

Question 36

36. In general, for exothermic reactions to be spontaneous

Answer

Temperature should be low

Answer

Temperature should be high

Answer

Temperature should be zero

Answer

Temperature has no effect

Question 37

37. 1 mole of H₂SO₄ is mixed with 2 mole of NaOH. The heat evolved will be

Answer

2 x 57.3 kJ

Answer

Cannot be predicted

Question 38

38. When water is added to quick lime, the reaction is

Answer

Endothermic

Answer

Photochemical

Answer

Exothermic

Question 39

39. An exothermic reaction is one in which the reacting substances

Answer

Have more energy than the products

Answer

Are at a higher temperature than the products

Answer

Have less energy than the products

Answer

Have the same energy as the products

Question 40

40. What is the entropy change (in JK¯¹ mol¯¹) when one mole of ice is converted into water at 0°C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol¯¹ at 0°C)

Question 41

41. When enthalpy of reactants is higher than products, then reaction will be

Answer

Exothermic

Answer

Spontaneous

Answer

Non-spontaneous

Answer

Endothermic

Question 42

42. What type of reaction releases energy and does not require initial energy to occur?

Answer

Endothermic

Answer

Both a and b

Answer

Decomposition

Answer

Exothermic

Question 43

43. Enthalpy of formation of HF and HCl are – 161 kJ and -92 kJ respectively. Which of the following statements is incorrect?

Answer

HF and HCl are endothermic compounds

Answer

HF is more stable than HCl

Answer

HCl is more stable than HF

Answer

The affinity of fluorine to hydrogen is greater than the affinity of chlorine to hydrogen

Question 44

44. Total energy of a system is

Answer

K.E, + heat energy

Answer

P.E, + K.E.

Answer

P.E. + heat energy

Answer

P.E, + mechanical energy

Question 45

45. The enthalpies of combustion of carbon and carbon monoxide are -390 kJ mol¯¹ and -278 kJ mol¯¹ respectively. The enthalpy of formation of carbon monoxide is

Answer

-112 kJ mol¯¹

Answer

112 kJ mol¯¹

Answer

-668 kJ mol¯¹

Answer

668 kJ mol¯¹

Question 46

46. An endothermic reaction is one in which

Answer

Heat is absorbed

Answer

Heat is evolved

Answer

Heat is converted into mechanical work

Answer

Heat is converted into electricity

Question 47

47. The internal energy change when a system goes form state A to B is 40 kJ.mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy?

Question 48

48. Which of the following value of ∆Hf’ represent that the product is least stale?

Answer

+21.4 kcal mol¯¹

Answer

-94.0 kcal mol¯¹

Answer

+64.8 kcal mol¯¹

Answer

-231.6 kcal mol¯¹

Question 49

49. Most of the reactions which give stable products are

Answer

Isothermal

Answer

Endothermic

Answer

None of these

Answer

Exothermic

Question 50

50. Four containers hold the following quantity at the same temperature. Which one has the highest heat capacity?

Answer

4 kg H₂O

Answer

1 kg H₂O

Answer

3 kg H₂O

Answer

2 kg H₂O

Question 51

51. For a system in equilibrium, ∆ G = 0, under conditions of constant

Answer

Temperature and volume

Answer

Temperature and pressure

Answer

Energy and volume

Answer

Pressure and volume

Question 52

52. Quantity of heat evolved or absorbed during reaction measure according to

Answer

P∆V + nRT

Answer

∆H = ∆E + P∆V

Answer

∆E = q + w

Answer

Q = m x X x ∆ T

Question 53

53. Mechanical work is especially important in systems that contain

Answer

Solid-liquid

Answer

Liquid-liquid

Answer

Solid-solid

Question 54

54. Unit of heat in S.I system is

Question 55

55. Which statement describes characteristics of an endothermic reaction?

Answer

The sign of H is positive, and the products have less potential energy than the reactants

Answer

The sign of H is positive and the products a have more potential energy than the reactant

Answer

The sign of H is negative, and the products have more potential energy than the reactants

Answer

The sign of H is negative, and the products have less potential energy than the reactants

Question 56

56. The energy required to break 1 mole of bonds to form neutral atom is

Answer

None of these

Answer

Bond strength

Answer

Bond energy

Answer

Bond length

Question 57

57. What would be the heat released when an aqueous solution containing 0.5 mole of HNO₃ is mixed with 0.3 mol of OH¯ (enthalpy of neutralization is -57.1 kJ)

Question 58

58. In endothermic reactions, the heat content of the

Answer

Both a and b

Answer

Reactants is more than that of products

Answer

Reactants and products are equal

Answer

Products is more than that of reactants

Question 59

59. Free energy change for a reversible process is:

Answer

Unpredictable

Answer

Equal to zero

Question 60

60. The reason of kinetic energy of the molecules of a gaseous substance among the following is

Answer

Rotational motion

Answer

Vibrational motion

Answer

The sum of all motions which are possible

Answer

Translational motion

Question 61

61. Which of the following units represents largest amount of energy?

Answer

Electron vol

Question 62

62. For a melting of a solid at 25°C, the fusion process requires energy equivalent to 2906 Joules to be added to system considering the process to be reversible at fusion point, the entropy change of the process is

Answer

9.75 JK¯¹

Answer

2.33 JK¯¹

Answer

Insufficient data

Answer

11.272 JK¯¹

Question 63

63. What type of chemical reaction absorbs energy and requires energy for the reaction occur?

Answer

Endothermic

Answer

Exothermic

Answer

Both a and b

Question 64

64. Pumping of water uphill is

Answer

Non spontaneous

Answer

Irreversible process

Answer

Spontaneous process

Answer

None of these

Answer 182

Changes in heat or reaction

Answer 183

Equilibrium constant

Answer 184

Influence of pressure on volume of a gas

Answer 185

Rate of reaction

Answer 186

Free energy of reaction

Answer 187

Entropy of reaction

Answer 188

Remains same

Answer 189

Remains constant

Answer 190

Enthalpy change

Answer 191

Free energy change

Answer 192

Entropy change

Answer 193

Internal energy change

Answer 194

2x – y/2

Answer 195

Y – 2x/2

Answer 196

Copper calorimeter

Answer 197

Bomb calorimeter

Answer 198

Glass calorimeter

Answer 199

Breaking of chemical bonds

Answer 200

Making of chemical bond

Answer 201

Burning of carbon

Answer 202

All of these

Answer 203

Release of 109 kcal of energy

Answer 204

Release of 218 kcal of energy

Answer 205

Absorption of 218 kcal of energy

Answer 206

Unpredictable

Answer 207

Isothermal

Answer 208

The heat of reaction at constant volume is denoted by ∆E.

Answer 209

The absolute value of enthalpy (H) can be determined experimentally

Answer 210

Neutralization is always exothermic

Answer 211

Dissolution on NH₄Cl in excess of water is an endothermic process

Answer 212

Continuous production of mechanical work without supplying an equivalent amount of heat energy

Answer 213

Work done is independent of its path

Answer 214

An equivalent amount of heat energy can neither be created nor destroyed

Answer 215

One form of energy can be transferred to an equivalent amount of the kind of energy

Answer 216

Burning of coal is and endothermic process

Answer 217

Burning of coal in air releases large amount of energy

Answer 218

Coal and air react giving a reversible reaction

Answer 219

None of these

Answer 220

Gibbs free energy

Answer 221

Internal energy

Answer 222

A lowering of energy

Answer 223

A lowering of free energy

Answer 224

No energy change

Answer 225

An increase in internal energy

Answer 226

-27 KJ/mole

Answer 227

190 KJ/mole

Answer 228

386 KJ/mole

Answer 229

395 KJ/mole

Answer 230

State function

Answer 231

Physical property

Answer 232

Energy of the system

Answer 233

Chemical property

Answer 234

∆H = ∆E + d

Answer 235

∆H = ∆E – d

Answer 236

∆H = ∆E + Pv

Answer 237

∆H = ∆E – PV

Answer 238

Electron – volt

Answer 239

Electron – volt

Answer 240

A process where no heat changes occur

Answer 241

An endothermic change

Answer 242

An exothermic change

Answer 243

A process accompanied by chemical reaction

Answer 244

Gibbs free energy

Answer 245

Internal energy

Answer 246

∆ H must be unity

Answer 247

∆ H must be zero

Answer 248

∆ H must be positive

Answer 249

∆ H must be negative

Answer 250

Decrease of free energy

Answer 251

Decrease of entropy

Answer 252

Increase of enthalpy

Answer 253

Increase of free energy

Answer 254

Physical process

Answer 255

Chemical process

Answer 256

Biochemical process

Answer 257

Endothermic process

Answer 258

Chemical reaction can take place

Answer 259

Temperature of the system may rise

Answer 260

Change in state of system can occur

Answer 261

Glass calorimeter

Answer 262

Thermometer

Answer 263

Water equivalent

Answer 264

Thermal capacity

Answer 265

Specific heat

Answer 266

None of these

Answer 267

71030 calories

Answer 268

70960 calories

Answer 269

-70 calories

Answer 270

+70 calories

Answer 271

Combustion

Answer 272

Neutralization

Answer 273

Thermal decomposition

Answer 274

Respiration

Answer 275

Glass Calorimeter

Answer 276

Thermometer

Answer 277

Bomb Calorimeter

Answer 278

The principle of conservation of energy

Answer 279

The principle of conservation of matter

Answer 280

Equivalence of mechanical and thermal energy

Answer 281

Equivalent of mechanical and chemical energy

Answer 282

Graphite is more stable than diamond

Answer 283

Both are equally stable

Answer 284

Stability cannot to predicated

Answer 285

Graphite has more energy than diamond

Answer 286

Heat is evolved

Answer 287

Heat is absorbed

Answer 288

No change in heat contents takes place

Answer 289

Temperature increases

Answer 290

None of these

Answer 291

It is reversible

Answer 292

It is not irreversible

Answer 293

It is irreversible

Total Questions:	108
Time Allowed:	60 Minutes
Total Marks:	108
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