Thermo-Chemistry Online Mcqs Test

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Question 1

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

Answer

Bond length

Answer

Bond energy

Answer

Bond strength

Answer

None of these

Question 2

2. 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 3

3. The apparatus used to measure the enthalpy of combustion of a substance is

Answer

Bomb calorimeter

Answer

Glass calorimeter

Answer

Copper calorimeter

Question 4

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

Answer

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

Answer

The energy change in a cyclic process is not zero

Answer

Born Haber cycle is different from Hess’s law

Answer

The lattice energy of the crystalline substances can be calculated easily

Question 5

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

Answer

3 kg H₂O

Answer

1 kg H₂O

Answer

4 kg H₂O

Answer

2 kg H₂O

Question 6

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

Answer

Isothermal

Question 7

7. A cylinder of gas supplied by PSO is assumed to contain 14 kg of butane. If a normal family requires 20,000 kJ of energy per day for cooking, butane gas in the cylinder last for ……. Days (∆Hc of C₄H₁₀ = -2658 kJ per mole)

Question 8

8. C (diamond) → C(Graphite), ∆ H = -ve. This show that

Answer

Graphite is more stable than diamond

Answer

Both are equally stable

Answer

Stability cannot to predicated

Answer

Graphite has more energy than diamond

Question 9

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

Answer

-94.0 kcal mol¯¹

Answer

+21.4 kcal mol¯¹

Answer

+64.8 kcal mol¯¹

Answer

-231.6 kcal mol¯¹

Question 10

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

Answer

Photochemical

Answer

Endothermic

Answer

Exothermic

Question 11

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

Answer

None of these

Question 12

12. Which statement describes characteristics of an endothermic reaction?

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 less potential energy than the reactants

Answer

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

Answer

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

Question 13

13. When 50 cm³ of 0.2 n H₂SO₄ is mixed with 50 cm³ of 1 N KOH, the heat liberated is

Question 14

14. Heat exchanged in a chemical reaction at constant temperature and pressure is called

Answer

Free energy change

Answer

Enthalpy change

Answer

Entropy change

Answer

Internal energy change

Question 15

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

Answer

HF is more stable than HCl

Answer

HF and HCl are endothermic compounds

Answer

HCl is more stable than HF

Answer

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

Question 16

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

Answer

Surrounding

Question 17

17. Unit of heat in S.I system is

Question 18

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

Answer

Thermodynamics

Answer

Stoichiometry

Answer

Thermochemistry

Question 19

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

Answer

Heat of combustion

Answer

Heat of sublimation

Answer

Heat of reaction

Answer

Heat of neutralization

Question 20

20. 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 21

21. 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 22

22. 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 23

23. 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 24

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

Answer

Energy of the system

Answer

Chemical property

Answer

Physical property

Answer

State function

Question 25

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

Answer

Water equivalent

Answer

Thermal capacity

Answer

Specific heat

Answer

None of these

Question 26

26. 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 27

27. An endothermic reaction is one in which

Answer

Heat is converted into electricity

Answer

Heat is converted into mechanical work

Answer

Heat is absorbed

Answer

Heat is evolved

Question 28

28. The heats evolved in combustion of rhombic and monoclinic sulphur are -70960 and -71030 cal mol¯¹ respectively. What will be heat of conversion of rhombic sulphur to monoclinic?

Answer

71030 calories

Answer

+70 calories

Answer

70960 calories

Answer

-70 calories

Question 29

29. If at 298 K the bond energies of C-H, C-C, C=C and H-H bonds are respectively 414, 347, 615 and 435 kJ mol¯¹, the value of enthalpy change for the reaction H₂C = CH₂(g) + H₂(g) → H₃C – CH₃(g) at 298 K will be

Question 30

30. Which type of reactions cannot occur spontaneously?

Answer

Endothermic

Answer

Exothermic

Answer

Both a and b

Question 31

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

Answer

∆H = ∆E – PV

Answer

∆H = ∆E + Pv

Answer

∆H = ∆E + d

Answer

∆H = ∆E – d

Question 32

32. All the naturally occurring processes proceed spontaneously in a direction which lead to

Answer

Increase of enthalpy

Answer

Decrease of free energy

Answer

Increase of free energy

Answer

Decrease of entropy

Question 33

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

Answer

Graham’s law

Answer

Boyle’s law

Answer

Henry’s law

Answer

Hess’s law

Question 34

34. The value of ∆Hо₋н is 109 kcal mol¯¹. Then formation of one mole of water in gaseous state form H(g) and O(g) is accompanied by

Answer

Release of 109 kcal of energy

Answer

Release of 218 kcal of energy

Answer

Unpredictable

Answer

Absorption of 218 kcal of energy

Question 35

35. In general, for exothermic reactions to be spontaneous

Answer

Temperature should be zero

Answer

Temperature has no effect

Answer

Temperature should be high

Answer

Temperature should be low

Question 36

36. 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 37

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

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

Answer

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

Question 38

38. Hess’s law deals with

Answer

Influence of pressure on volume of a gas

Answer

Rate of reaction

Answer

Equilibrium constant

Answer

Changes in heat or reaction

Question 39

39. 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 40

40. Total energy of a system is

Answer

P.E, + mechanical energy

Answer

P.E. + heat energy

Answer

K.E, + heat energy

Answer

P.E, + K.E.

Question 41

41. 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

-439.3 kJ mol¯¹

Answer

-221.1 kJ mol¯¹

Answer

-339.3 kJ mol¯¹

Answer

-523.3 kJ mol¯¹

Question 42

42. Calorie is equivalent to

Question 43

43. Which of the following statement is contrary to first law of thermodynamics?

Answer

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

Answer

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

Answer

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

Answer

Work done is independent of its path

Question 44

44. Enthalpy of a reaction can be measured by

Answer

Glass calorimeter

Answer

Thermometer

Question 45

45. Evaporation of water is

Answer

A process where no heat changes occur

Answer

An endothermic change

Answer

A process accompanied by chemical reaction

Answer

An exothermic change

Question 46

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

Question 47

47. Which of the following is not correct?

Answer

Dissolution on NH₄Cl in excess of water is an endothermic process

Answer

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

Answer

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

Answer

Neutralization is always exothermic

Question 48

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

Answer

Charles’s law

Answer

Henry’s law

Answer

Hess’s law

Answer

Graham’s law

Question 49

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

Answer

Second law

Answer

Zeroth law

Question 50

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

Answer

P∆V + nRT

Answer

Q = m x X x ∆ T

Answer

∆H = ∆E + P∆V

Answer

∆E = q + w

Question 51

51. 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 52

52. 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

-27 KJ/mole

Answer

395 KJ/mole

Answer

386 KJ/mole

Answer

190 KJ/mole

Question 53

53. Most of the thermodynamic parameters are

Answer

Surrounding

Answer

State function

Question 54

54. Mechanical work is especially important in systems that contain

Answer

Solid-solid

Answer

Liquid-liquid

Answer

Solid-liquid

Question 55

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

Answer

Hat of formation

Answer

Heat of combustion

Answer

Heat of neutralization

Answer

Enthalpy of reaction

Question 56

56. For a given process, the heat changes at constant pressure (q_p) and at constant volume (q_v) are related to each other as:

Question 57

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

Answer

Electron vol

Question 58

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

Answer

Not change

Answer

None of these

Question 59

59. 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 60

60. 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 61

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

Answer

Thermodynamics

Answer

Chemical kinetics

Answer

Thermochemistry

Question 62

62. Enthalpy of combustion for food, fuel and other compounds can be measured accurately by

Answer

Thermometer

Answer

Bomb Calorimeter

Answer

Glass Calorimeter

Question 63

63. 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 64

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

Answer

Coal and air react giving a reversible reaction

Answer

None of these

Answer

Burning of coal in air releases large amount of energy

Answer

Burning of coal is and endothermic process

Answer 173

Burning of carbon

Answer 174

All of these

Answer 175

Breaking of chemical bonds

Answer 176

Making of chemical bond

Answer 177

Electron – volt

Answer 178

Translational motion

Answer 179

Vibrational motion

Answer 180

The sum of all motions which are possible

Answer 181

Rotational motion

Answer 182

Y – 2x/2

Answer 183

2x – y/2

Answer 184

Thermal decomposition

Answer 185

Combustion

Answer 186

Respiration

Answer 187

Neutralization

Answer 188

Irreversible

Answer 189

Reversible

Answer 190

Spontaneous

Answer 191

Non-spontaneous

Answer 192

2 x 57.3 kJ

Answer 193

Cannot be predicted

Answer 194

Chemical reaction can take place

Answer 195

Change in state of system can occur

Answer 196

Temperature of the system may rise

Answer 197

Decrease in temperature

Answer 198

Any substance

Answer 199

State function

Answer 200

Surrounding

Answer 201

Heat is absorbed

Answer 202

No change in heat contents takes place

Answer 203

Temperature increases

Answer 204

Heat is evolved

Answer 205

Pressure and temperature

Answer 206

Heat and work

Answer 207

Heat and volume

Answer 208

Pressure and volume

Answer 209

Spontaneous

Answer 210

Non-spontaneous

Answer 211

Exothermic

Answer 212

Endothermic

Answer 213

Exothermic

Answer 214

Non-spontaneous

Answer 215

Spontaneous

Answer 216

Endothermic

Answer 217

Non-spontaneous

Answer 218

Endothermic

Answer 219

Exothermic

Answer 220

Spontaneous

Answer 221

P.E + mechanical energy

Answer 222

P.E + heat energy

Answer 223

K.E + heat energy

Answer 224

Remains constant

Answer 225

Remains same

Answer 226

Temperature and volume

Answer 227

Energy and volume

Answer 228

Temperature and pressure

Answer 229

Pressure and volume

Answer 230

68 – 48 + 14

Answer 231

– 68 + 48 – 14

Answer 232

– 68 – 48 + 14

Answer 233

68 + 48 + 14

Answer 234

Electron – volt

Answer 235

Unpredictable

Answer 236

Equal to zero

Answer 237

Gibbs free energy

Answer 238

Internal energy

Answer 239

Heat and volume

Answer 240

Pressure and temperature

Answer 241

Pressure and volume

Answer 242

Heat and work

Answer 243

Have the same energy as the products

Answer 244

Have less energy than the products

Answer 245

Have more energy than the products

Answer 246

Are at a higher temperature than the products

Answer 247

Ice will sublime

Answer 248

Ice will melt

Answer 249

Water will vaporize

Answer 250

Water will freeze

Answer 251

∆ H must be positive

Answer 252

∆ H must be unity

Answer 253

∆ H must be negative

Answer 254

∆ H must be zero

Answer 255

It is reversible

Answer 256

It is not irreversible

Answer 257

None of these

Answer 258

It is irreversible

Answer 259

Entropy of reaction

Answer 260

Free energy of reaction

Answer 261

Photochemistry

Answer 262

Thermodynamics

Answer 263

Thermochemistry

Answer 264

Endothermic

Answer 265

Exothermic

Answer 266

Isothermal

Answer 267

None of these

Answer 268

The principle of conservation of matter

Answer 269

Equivalence of mechanical and thermal energy

Answer 270

Equivalent of mechanical and chemical energy

Answer 271

The principle of conservation of energy

Answer 272

Temperature

Answer 273

Gibbs free energy

Answer 274

Internal energy

Answer 275

Exothermic

Answer 276

Both a and b

Answer 277

Endothermic

Answer 278

Irreversible process

Answer 279

Spontaneous process

Answer 280

Non spontaneous

Answer 281

None of these

Answer 282

11.272 JK¯¹

Answer 283

2.33 JK¯¹

Answer 284

Insufficient data

Answer 285

9.75 JK¯¹

Answer 286

No energy change

Answer 287

A lowering of free energy

Answer 288

An increase in internal energy

Answer 289

A lowering of energy

Answer 290

Biochemical process

Answer 291

Endothermic process

Answer 292

Chemical process

Answer 293

Physical process

Total Questions:	108
Time Allowed:	60 Minutes
Total Marks:	108
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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