Thermo-Chemistry Online Mcqs Test

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Question 1

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

Answer

Surrounding

Question 2

2. Endothermic changes are indicated through

Answer

All of these

Answer

Breaking of chemical bonds

Answer

Burning of carbon

Answer

Making of chemical bond

Question 3

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

Answer

Glass calorimeter

Answer

Copper calorimeter

Answer

Bomb calorimeter

Question 4

4. 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

Reversible

Answer

Spontaneous

Answer

Non-spontaneous

Answer

Irreversible

Question 5

5. Conversion of copper hydroxide into copper oxide and water is an example of

Answer

Respiration

Answer

Thermal decomposition

Answer

Neutralization

Answer

Combustion

Question 6

6. 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 7

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

Answer

+21.4 kcal mol¯¹

Answer

-231.6 kcal mol¯¹

Answer

+64.8 kcal mol¯¹

Answer

-94.0 kcal mol¯¹

Question 8

8. Calorie is equivalent to

Question 9

9. 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

-339.3 kJ mol¯¹

Answer

-221.1 kJ mol¯¹

Question 10

10. The unit which indicates the largest amount of energy is

Answer

Electron – volt

Question 11

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

Answer

∆H = ∆E + P∆V

Answer

Q = m x X x ∆ T

Answer

∆E = q + w

Answer

P∆V + nRT

Question 12

12. 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 13

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

Question 14

14. Which one is not a state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 15

15. 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

Enthalpy of reaction

Answer

Heat of combustion

Answer

Heat of neutralization

Question 16

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

Answer

Stoichiometry

Answer

Thermochemistry

Answer

Thermodynamics

Question 17

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

Answer

Charles’s law

Answer

Graham’s law

Answer

Hess’s law

Answer

Henry’s law

Question 18

18. Two fundamental ways to transfer energy are

Answer

Heat and work

Answer

Pressure and volume

Answer

Heat and volume

Answer

Pressure and temperature

Question 19

19. A spontaneous change means

Answer

A lowering of free energy

Answer

No energy change

Answer

An increase in internal energy

Answer

A lowering of energy

Question 20

20. Most of the reactions which give stable products are

Answer

Exothermic

Answer

Endothermic

Answer

Isothermal

Answer

None of these

Question 21

21. Which type of reactions cannot occur spontaneously?

Answer

Exothermic

Answer

Both a and b

Answer

Endothermic

Question 22

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

Answer

Energy of the system

Answer

State function

Answer

Physical property

Answer

Chemical property

Question 23

23. In endothermic reactions, the heat content of the

Answer

Reactants and products are equal

Answer

Products is more than that of reactants

Answer

Both a and b

Answer

Reactants is more than that of products

Question 24

24. Most of the thermodynamic parameters are

Answer

State function

Answer

Surrounding

Question 25

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

Answer

None of these

Answer

Coal and air react giving a reversible reaction

Answer

Burning of coal in air releases large amount of energy

Answer

Burning of coal is and endothermic process

Question 26

26. 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

-70 calories

Answer

+70 calories

Answer

70960 calories

Answer

71030 calories

Question 27

27. Free energy change for a reversible process is:

Answer

Unpredictable

Answer

Equal to zero

Question 28

28. 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 29

29. In general, for exothermic reactions to be spontaneous

Answer

Temperature should be high

Answer

Temperature should be zero

Answer

Temperature should be low

Answer

Temperature has no effect

Question 30

30. All of the following are state function except

Question 31

31. The enthalpy of formation of carbon monoxide will be

Answer

Y – 2x/2

Answer

2x – y/2

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

Born Haber cycle is different from Hess’s law

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

Question 33

33. Unit of heat in S.I system is

Question 34

34. If internal energy of a system is increased

Answer

Change in state of system can occur

Answer

Temperature of the system may rise

Answer

Chemical reaction can take place

Question 35

35. 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 36

36. 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 37

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

Answer

Thermometer

Answer

Bomb Calorimeter

Answer

Glass Calorimeter

Question 38

38. 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 218 kcal of energy

Answer

Unpredictable

Answer

Release of 109 kcal of energy

Answer

Absorption of 218 kcal of energy

Question 39

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

Answer

Energy and volume

Answer

Temperature and pressure

Answer

Temperature and volume

Answer

Pressure and volume

Question 40

40. An adiabatic expansion of an ideal gas always has

Answer

Decrease in temperature

Question 41

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

Answer

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

Answer

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

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 42

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

Question 43

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

Answer

The sum of all motions which are possible

Answer

Vibrational motion

Answer

Translational motion

Answer

Rotational motion

Question 44

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

Answer

Photochemistry

Answer

Thermochemistry

Answer

Thermodynamics

Question 45

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

Answer

Have more energy than the products

Answer

Have the same energy as the products

Answer

Are at a higher temperature than the products

Answer

Have less energy than the products

Question 46

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

Question 47

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

Answer

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

Question 48

48. Two fundamental ways to transfer energy are

Answer

Pressure and temperature

Answer

Heat and volume

Answer

Pressure and volume

Answer

Heat and work

Question 49

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

Answer

Decrease of entropy

Answer

Increase of enthalpy

Answer

Increase of free energy

Answer

Decrease of free energy

Question 50

50. 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 51

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

Answer

None of these

Question 52

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

Answer

Photochemical

Answer

Endothermic

Answer

Exothermic

Question 53

53. 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 54

54. The law of Lavoisier and Laplace illustrates

Answer

Equivalent of mechanical and chemical energy

Answer

Equivalence of mechanical and thermal energy

Answer

The principle of conservation of energy

Answer

The principle of conservation of matter

Question 55

55. 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 vaporize

Answer

Water will freeze

Answer

Ice will melt

Answer

Ice will sublime

Question 56

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

Answer

Exothermic

Answer

Endothermic

Answer

Non-spontaneous

Answer

Spontaneous

Question 57

57. 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 58

58. Enthalpy of a reaction can be measured by

Answer

Glass calorimeter

Answer

Thermometer

Question 59

59. Total energy of a system is

Answer

K.E + heat energy

Answer

P.E + heat energy

Answer

P.E + mechanical energy

Question 60

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

Answer

Enthalpy change

Answer

Free energy change

Answer

Internal energy change

Answer

Entropy change

Question 61

61. 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 62

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

Answer

Electron – volt

Question 63

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

Question 64

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

Answer

Exothermic

Answer

Both a and b

Answer

Decomposition

Answer

Endothermic

Answer 175

Heat of sublimation

Answer 176

Heat of reaction

Answer 177

Heat of neutralization

Answer 178

Heat of combustion

Answer 179

Non spontaneous

Answer 180

Spontaneous process

Answer 181

Irreversible process

Answer 182

None of these

Answer 183

Cannot be predicted

Answer 184

2 x 57.3 kJ

Answer 185

∆H = ∆E – d

Answer 186

∆H = ∆E – PV

Answer 187

∆H = ∆E + d

Answer 188

∆H = ∆E + Pv

Answer 189

Heat is converted into mechanical work

Answer 190

Heat is absorbed

Answer 191

Heat is evolved

Answer 192

Heat is converted into electricity

Answer 193

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

Answer 194

Neutralization is always exothermic

Answer 195

Dissolution on NH₄Cl in excess of water is an endothermic process

Answer 196

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

Answer 197

Remains constant

Answer 198

Remains same

Answer 199

Thermal capacity

Answer 200

Specific heat

Answer 201

Water equivalent

Answer 202

None of these

Answer 203

Not change

Answer 204

None of these

Answer 205

Joule deg¯¹ atom¯¹

Answer 206

Joule deg¯¹ Kg¯¹

Answer 207

Joule deg¯¹ mol¯¹

Answer 208

Joule cm¯¹ deg¯¹

Answer 209

An endothermic change

Answer 210

A process accompanied by chemical reaction

Answer 211

A process where no heat changes occur

Answer 212

An exothermic change

Answer 213

It is reversible

Answer 214

None of these

Answer 215

It is not irreversible

Answer 216

It is irreversible

Answer 217

-27 KJ/mole

Answer 218

386 KJ/mole

Answer 219

190 KJ/mole

Answer 220

395 KJ/mole

Answer 221

Boyle’s law

Answer 222

Hess’s law

Answer 223

Graham’s law

Answer 224

Henry’s law

Answer 225

∆ H must be zero

Answer 226

∆ H must be unity

Answer 227

∆ H must be positive

Answer 228

∆ H must be negative

Answer 229

Exothermic

Answer 230

Non-spontaneous

Answer 231

Spontaneous

Answer 232

Endothermic

Answer 233

Non-spontaneous

Answer 234

Endothermic

Answer 235

Spontaneous

Answer 236

Exothermic

Answer 237

State function

Answer 238

Surrounding

Answer 239

Any substance

Answer 240

Changes in heat or reaction

Answer 241

Influence of pressure on volume of a gas

Answer 242

Equilibrium constant

Answer 243

Rate of reaction

Answer 244

Second law

Answer 245

Zeroth law

Answer 246

No change in heat contents takes place

Answer 247

Heat is evolved

Answer 248

Heat is absorbed

Answer 249

Temperature increases

Answer 250

Liquid-liquid

Answer 251

Solid-liquid

Answer 252

Solid-solid

Answer 253

Chemical process

Answer 254

Biochemical process

Answer 255

Endothermic process

Answer 256

Physical process

Answer 257

Endothermic

Answer 258

Both a and b

Answer 259

Exothermic

Answer 260

None of these

Answer 261

Bond strength

Answer 262

Bond energy

Answer 263

Bond length

Answer 264

Entropy of reaction

Answer 265

Free energy of reaction

Answer 266

HF and HCl are endothermic compounds

Answer 267

HCl is more stable than HF

Answer 268

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

Answer 269

HF is more stable than HCl

Answer 270

9.75 JK¯¹

Answer 271

Insufficient data

Answer 272

11.272 JK¯¹

Answer 273

2.33 JK¯¹

Answer 274

Thermodynamics

Answer 275

Thermochemistry

Answer 276

Chemical kinetics

Answer 277

Isothermal

Answer 278

Both are equally stable

Answer 279

Stability cannot to predicated

Answer 280

Graphite is more stable than diamond

Answer 281

Graphite has more energy than diamond

Answer 282

Electron vol

Answer 283

Gibbs free energy

Answer 284

Internal energy

Answer 285

Temperature

Answer 286

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

Answer 287

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

Answer 288

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

Answer 289

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

Answer 290

1 kg H₂O

Answer 291

4 kg H₂O

Answer 292

2 kg H₂O

Answer 293

3 kg H₂O

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