Thermo-Chemistry Online Mcqs Test

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Question 1

1. 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 2

2. System in which there is no exchange of matter, work or energy from surroundings is

Answer

Isothermal

Question 3

3. One mole of an ideal gas expands isothermally to ten times its original volume. The change in entropy is

Question 4

4. 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 5

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

Answer

Endothermic

Answer

Both a and b

Answer

Exothermic

Answer

Decomposition

Question 6

6. Enthalpy of a reaction can be measured by

Answer

Glass calorimeter

Answer

Thermometer

Question 7

7. Unit of heat in S.I system is

Question 8

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

Answer

Temperature

Question 9

9. Which of the following unit represent the largest amount of energy?

Answer

Electron – volt

Question 10

10. Change in enthalpy of a system can be calculated by following relationship

Answer

∆H = ∆E + Pv

Answer

∆H = ∆E – d

Answer

∆H = ∆E – PV

Answer

∆H = ∆E + d

Question 11

11. 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

Spontaneous

Answer

Non-spontaneous

Answer

Reversible

Question 12

12. Total energy of a system is

Answer

K.E + heat energy

Answer

P.E + mechanical energy

Answer

P.E + heat energy

Question 13

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

Answer

Exothermic

Answer

Endothermic

Answer

Photochemical

Question 14

14. Which type of reactions cannot occur spontaneously?

Answer

Both a and b

Answer

Exothermic

Answer

Endothermic

Question 15

15. 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

668 kJ mol¯¹

Answer

-668 kJ mol¯¹

Answer

112 kJ mol¯¹

Answer

-112 kJ mol¯¹

Question 16

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

Answer

1 kg H₂O

Answer

2 kg H₂O

Answer

4 kg H₂O

Answer

3 kg H₂O

Question 17

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

Answer

Thermochemistry

Answer

Photochemistry

Answer

Thermodynamics

Question 18

18. Which one is not a state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 19

19. The molar heat capacity of water at constant pressure, Cᵨ, is 75 JK¯¹ mol¯¹. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is

Question 20

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

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 enthalpy change

Answer

It has small + ve value for enthalpy change

Answer

It has a large – ve value for the entropy change

Question 21

21. 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 22

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

Answer

Joule deg¯¹ Kg¯¹

Answer

Joule deg¯¹ mol¯¹

Answer

Joule cm¯¹ deg¯¹

Answer

Joule deg¯¹ atom¯¹

Question 23

23. Two fundamental ways to transfer energy are

Answer

Pressure and temperature

Answer

Pressure and volume

Answer

Heat and work

Answer

Heat and volume

Question 24

24. 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

-439.3 kJ mol¯¹

Answer

-221.1 kJ mol¯¹

Answer

-339.3 kJ mol¯¹

Question 25

25. Calorie is equivalent to

Question 26

26. A chemist heated a balloon by supplying 600 J of heat. The balloon expands doing 200 J of work against the atmospheric pressure. The change in internal energy of

Question 27

27. An endothermic reaction is one in which

Answer

Heat is converted into mechanical work

Answer

Heat is converted into electricity

Answer

Heat is absorbed

Answer

Heat is evolved

Question 28

28. 1 mole of H₂SO₄ is mixed with 2 mole of NaOH. The heat evolved will be

Answer

Cannot be predicted

Answer

2 x 57.3 kJ

Question 29

29. 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 30

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

Answer

Have the same energy as the products

Answer

Have less energy than the products

Answer

Are at a higher temperature than the products

Answer

Have more energy than the products

Question 31

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

Answer

Zeroth law

Answer

Second law

Question 32

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

Answer

Electron vol

Question 33

33. Sublimation, vaporization, melting and p photosynthesis all are examples of

Answer

Endothermic process

Answer

Biochemical process

Answer

Physical process

Answer

Chemical process

Question 34

34. The enthalpies of all elements in their standard states are

Question 35

35. The best characteristic of spontaneous reactions among the following is that

Answer

It is irreversible

Answer

None of these

Answer

It is reversible

Answer

It is not irreversible

Question 36

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

Answer

Hess’s law

Answer

Charles’s law

Answer

Henry’s law

Answer

Graham’s law

Question 37

37. Free energy change for a reversible process is:

Answer

Unpredictable

Answer

Equal to zero

Question 38

38. An adiabatic expansion of an ideal gas always has

Answer

Decrease in temperature

Question 39

39. 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

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

Answer

The energy change in a cyclic process is not zero

Question 40

40. The law of Lavoisier and Laplace illustrates

Answer

Equivalence of mechanical and thermal energy

Answer

The principle of conservation of matter

Answer

Equivalent of mechanical and chemical energy

Answer

The principle of conservation of energy

Question 41

41. 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

2.33 JK¯¹

Answer

9.75 JK¯¹

Answer

11.272 JK¯¹

Answer

Insufficient data

Question 42

42. Which one is not state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 43

43. Burning of coal in air is initiated by a spark and it is an example of spontaneous reaction because

Answer

Burning of coal in air releases large amount of energy

Answer

None of these

Answer

Coal and air react giving a reversible reaction

Answer

Burning of coal is and endothermic process

Question 44

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

Answer

HCl is more stable than HF

Answer

HF and HCl are endothermic compounds

Answer

HF is more stable than HCl

Answer

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

Question 45

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

Answer

Endothermic

Answer

Both a and b

Answer

Exothermic

Question 46

46. In general, for exothermic reactions to be spontaneous

Answer

Temperature should be zero

Answer

Temperature should be low

Answer

Temperature should be high

Answer

Temperature has no effect

Question 47

47. 10.16 g of graphite is burnt in a bomb calorimeter and the temperature rise recorded is 3.78 K. Calculate the enthalpy of combustion of graphite if the heat capacity is 86.02 KJ K¯¹

Answer

386 KJ/mole

Answer

190 KJ/mole

Answer

-27 KJ/mole

Answer

395 KJ/mole

Question 48

48. 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 49

49. 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 50

50. If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

Answer

Remains constant

Answer

Remains same

Question 51

51. Total energy depends upon the state of system

Answer

Entropy of reaction

Answer

Free energy of reaction

Question 52

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

Question 53

53. A macroscopic property of a system which describes the initial and final state of the system is called

Answer

Energy of the system

Answer

Physical property

Answer

Chemical property

Answer

State function

Question 54

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

Answer

None of these

Answer

Not change

Question 55

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

Answer

-231.6 kcal mol¯¹

Answer

+21.4 kcal mol¯¹

Answer

-94.0 kcal mol¯¹

Answer

+64.8 kcal mol¯¹

Question 56

56. The heat required to raise the temperature of a body by 1 K is called

Answer

Thermal capacity

Answer

None of these

Answer

Water equivalent

Answer

Specific heat

Question 57

57. In endothermic reactions, the heat content of the

Answer

Both a and b

Answer

Reactants is more than that of products

Answer

Products is more than that of reactants

Answer

Reactants and products are equal

Question 58

58. 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 59

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

Answer

Thermodynamics

Answer

Chemical kinetics

Answer

Thermochemistry

Question 60

60. Most of the thermodynamic parameters are

Answer

Surrounding

Answer

State function

Question 61

61. 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

Ice will sublime

Answer

Water will vaporize

Answer

Water will freeze

Answer

Ice will melt

Question 62

62. If internal energy of the system is increased

Answer

Chemical reaction may take place

Answer

Change in state of the system is increased

Answer

Temperature of the system may rise

Question 63

63. Unit of heat is SI system is

Question 64

64. Mechanical work is especially important in systems that contain

Answer

Liquid-liquid

Answer

Solid-liquid

Answer

Solid-solid

Answer 158

Increase of free energy

Answer 159

Decrease of free energy

Answer 160

Increase of enthalpy

Answer 161

Decrease of entropy

Answer 162

Internal energy change

Answer 163

Enthalpy change

Answer 164

Free energy change

Answer 165

Entropy change

Answer 166

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

Answer 167

Dissolution on NH₄Cl in excess of water is an endothermic process

Answer 168

Neutralization is always exothermic

Answer 169

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

Answer 170

Y – 2x/2

Answer 171

2x – y/2

Answer 172

Exothermic

Answer 173

Endothermic

Answer 174

Spontaneous

Answer 175

Non-spontaneous

Answer 176

Bond energy

Answer 177

Bond strength

Answer 178

Bond length

Answer 179

None of these

Answer 180

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

Answer 181

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

Answer 182

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

Answer 183

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

Answer 184

None of these

Answer 185

Hat of formation

Answer 186

Enthalpy of reaction

Answer 187

Heat of combustion

Answer 188

Heat of neutralization

Answer 189

Spontaneous

Answer 190

Non-spontaneous

Answer 191

Endothermic

Answer 192

Exothermic

Answer 193

Heat and volume

Answer 194

Pressure and volume

Answer 195

Pressure and temperature

Answer 196

Heat and work

Answer 197

Surrounding

Answer 198

Heat is evolved

Answer 199

Temperature increases

Answer 200

Heat is absorbed

Answer 201

No change in heat contents takes place

Answer 202

Thermochemistry

Answer 203

Stoichiometry

Answer 204

Thermodynamics

Answer 205

The sum of all motions which are possible

Answer 206

Vibrational motion

Answer 207

Translational motion

Answer 208

Rotational motion

Answer 209

Graphite is more stable than diamond

Answer 210

Stability cannot to predicated

Answer 211

Graphite has more energy than diamond

Answer 212

Both are equally stable

Answer 213

Bomb Calorimeter

Answer 214

Thermometer

Answer 215

Glass Calorimeter

Answer 216

Copper calorimeter

Answer 217

Bomb calorimeter

Answer 218

Glass calorimeter

Answer 219

A process accompanied by chemical reaction

Answer 220

An endothermic change

Answer 221

An exothermic change

Answer 222

A process where no heat changes occur

Answer 223

Rate of reaction

Answer 224

Changes in heat or reaction

Answer 225

Influence of pressure on volume of a gas

Answer 226

Equilibrium constant

Answer 227

No energy change

Answer 228

A lowering of energy

Answer 229

An increase in internal energy

Answer 230

A lowering of free energy

Answer 231

– 68 – 48 + 14

Answer 232

68 – 48 + 14

Answer 233

68 + 48 + 14

Answer 234

– 68 + 48 – 14

Answer 235

Temperature and volume

Answer 236

Energy and volume

Answer 237

Pressure and volume

Answer 238

Temperature and pressure

Answer 239

None of these

Answer 240

Isothermal

Answer 241

Exothermic

Answer 242

Endothermic

Answer 243

K.E, + heat energy

Answer 244

P.E. + heat energy

Answer 245

P.E, + K.E.

Answer 246

P.E, + mechanical energy

Answer 247

Electron – volt

Answer 248

Heat of neutralization

Answer 249

Heat of sublimation

Answer 250

Heat of reaction

Answer 251

Heat of combustion

Answer 252

Surrounding

Answer 253

State function

Answer 254

Any substance

Answer 255

∆ H must be negative

Answer 256

∆ H must be zero

Answer 257

∆ H must be unity

Answer 258

∆ H must be positive

Answer 259

Endothermic

Answer 260

Spontaneous

Answer 261

Non-spontaneous

Answer 262

Exothermic

Answer 263

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

Answer 264

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

Answer 265

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

Answer 266

Work done is independent of its path

Answer 267

Making of chemical bond

Answer 268

Breaking of chemical bonds

Answer 269

All of these

Answer 270

Burning of carbon

Answer 271

Henry’s law

Answer 272

Boyle’s law

Answer 273

Graham’s law

Answer 274

Hess’s law

Answer 275

Non spontaneous

Answer 276

None of these

Answer 277

Irreversible process

Answer 278

Spontaneous process

Answer 279

Temperature of the system may rise

Answer 280

Change in state of system can occur

Answer 281

Chemical reaction can take place

Answer 282

Unpredictable

Answer 283

Absorption of 218 kcal of energy

Answer 284

Release of 218 kcal of energy

Answer 285

Release of 109 kcal of energy

Answer 286

Respiration

Answer 287

Neutralization

Answer 288

Combustion

Answer 289

Thermal decomposition

Answer 290

71030 calories

Answer 291

-70 calories

Answer 292

+70 calories

Answer 293

70960 calories

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