Thermo-Chemistry Online Mcqs Test

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Question 1

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

Answer

Isothermal

Question 2

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

Answer

None of these

Question 3

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

Answer

Endothermic

Answer

Decomposition

Answer

Both a and b

Answer

Exothermic

Question 4

4. 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 5

5. Free energy change for a reversible process is:

Answer

Unpredictable

Answer

Equal to zero

Question 6

6. Most of the reactions which give stable products are

Answer

Isothermal

Answer

Exothermic

Answer

None of these

Answer

Endothermic

Question 7

7. 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 8

8. 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 9

9. 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 10

10. In endothermic reactions, the heat content of the

Answer

Reactants is more than that of products

Answer

Products is more than that of reactants

Answer

Both a and b

Answer

Reactants and products are equal

Question 11

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

Question 12

12. 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 is more stable than HCl

Answer

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

Answer

HF and HCl are endothermic compounds

Question 13

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

Answer

Combustion

Answer

Neutralization

Answer

Thermal decomposition

Answer

Respiration

Question 14

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

Answer

3 kg H₂O

Answer

2 kg H₂O

Answer

4 kg H₂O

Answer

1 kg H₂O

Question 15

15. 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 melt

Answer

Water will freeze

Answer

Water will vaporize

Answer

Ice will sublime

Question 16

16. Two fundamental ways to transfer energy are

Answer

Heat and work

Answer

Heat and volume

Answer

Pressure and volume

Answer

Pressure and temperature

Question 17

17. An adiabatic expansion of an ideal gas always has

Answer

Decrease in temperature

Question 18

18. 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 19

19. Unit of heat in S.I system is

Question 20

20. The enthalpy of formation of carbon monoxide will be

Answer

Y – 2x/2

Answer

2x – y/2

Question 21

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

Answer

None of these

Answer

Burning of coal is and endothermic process

Answer

Burning of coal in air releases large amount of energy

Answer

Coal and air react giving a reversible reaction

Question 22

22. 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 23

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

Answer

Temperature and volume

Answer

Energy and volume

Answer

Pressure and volume

Answer

Temperature and pressure

Question 24

24. Endothermic changes are indicated through

Answer

Breaking of chemical bonds

Answer

All of these

Answer

Burning of carbon

Answer

Making of chemical bond

Question 25

25. Total energy of a system is

Answer

P.E. + heat energy

Answer

K.E, + heat energy

Answer

P.E, + mechanical energy

Answer

P.E, + K.E.

Question 26

26. 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 27

27. When a bond breaks

Answer

No change in heat contents takes place

Answer

Heat is evolved

Answer

Heat is absorbed

Answer

Temperature increases

Question 28

28. 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

-339.3 kJ mol¯¹

Answer

-221.1 kJ mol¯¹

Answer

-439.3 kJ mol¯¹

Answer

-523.3 kJ mol¯¹

Question 29

29. The law of Lavoisier and Laplace illustrates

Answer

The principle of conservation of matter

Answer

The principle of conservation of energy

Answer

Equivalent of mechanical and chemical energy

Answer

Equivalence of mechanical and thermal energy

Question 30

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

Answer

Internal energy change

Answer

Entropy change

Answer

Free energy change

Answer

Enthalpy change

Question 31

31. 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 32

32. 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 33

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

Answer

Electron – volt

Question 34

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

Answer

Joule deg¯¹ mol¯¹

Answer

Joule deg¯¹ atom¯¹

Answer

Joule deg¯¹ Kg¯¹

Answer

Joule cm¯¹ deg¯¹

Question 35

35. 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 a large – ve value for the entropy change

Answer

It has small + ve value for enthalpy change

Answer

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

Question 36

36. Enthalpy of a reaction can be measured by

Answer

Thermometer

Answer

Glass calorimeter

Question 37

37. For a reaction to occur spontaneously

Answer

∆ H must be unity

Answer

∆ H must be negative

Answer

∆ H must be positive

Answer

∆ H must be zero

Question 38

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

Answer

Hess’s law

Answer

Graham’s law

Answer

Boyle’s law

Answer

Henry’s law

Question 39

39. 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

190 KJ/mole

Answer

386 KJ/mole

Answer

-27 KJ/mole

Answer

395 KJ/mole

Question 40

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

Answer

Electron vol

Question 41

41. Evaporation of water is

Answer

An endothermic change

Answer

An exothermic change

Answer

A process accompanied by chemical reaction

Answer

A process where no heat changes occur

Question 42

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

Question 43

43. Hess’s law deals with

Answer

Influence of pressure on volume of a gas

Answer

Changes in heat or reaction

Answer

Rate of reaction

Answer

Equilibrium constant

Question 44

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

Answer

None of these

Answer

Specific heat

Answer

Thermal capacity

Answer

Water equivalent

Question 45

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

Answer

None of these

Answer

Bond energy

Answer

Bond strength

Answer

Bond length

Question 46

46. All of the following are state function except

Question 47

47. 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 48

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

Question 49

49. 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

Unpredictable

Answer

Release of 218 kcal of energy

Answer

Absorption of 218 kcal of energy

Answer

Release of 109 kcal of energy

Question 50

50. 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

Spontaneous

Answer

Reversible

Answer

Irreversible

Answer

Non-spontaneous

Question 51

51. Which one is not a state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 52

52. 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 53

53. 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 54

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

Answer

Glass calorimeter

Answer

Bomb calorimeter

Answer

Copper calorimeter

Question 55

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

Answer

Are at a higher temperature than the products

Answer

Have the same energy as the products

Answer

Have less energy than the products

Answer

Have more energy than the products

Question 56

56. A spontaneous change means

Answer

An increase in internal energy

Answer

A lowering of energy

Answer

No energy change

Answer

A lowering of free energy

Question 57

57. 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 58

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

Answer

Surrounding

Answer

State function

Answer

Any substance

Question 59

59. 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

State function

Answer

Physical property

Question 60

60. 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

70960 calories

Answer

-70 calories

Answer

+70 calories

Answer

71030 calories

Question 61

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

Answer

Increase of free energy

Answer

Decrease of entropy

Answer

Decrease of free energy

Answer

Increase of enthalpy

Question 62

62. Total energy depends upon the state of system

Answer

Entropy of reaction

Answer

Free energy of reaction

Question 63

63. 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 64

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

Answer

Surrounding

Answer 167

Electron – volt

Answer 168

Stability cannot to predicated

Answer 169

Graphite is more stable than diamond

Answer 170

Graphite has more energy than diamond

Answer 171

Both are equally stable

Answer 172

Liquid-liquid

Answer 173

Solid-liquid

Answer 174

Solid-solid

Answer 175

9.75 JK¯¹

Answer 176

2.33 JK¯¹

Answer 177

Insufficient data

Answer 178

11.272 JK¯¹

Answer 179

Temperature

Answer 180

Zeroth law

Answer 181

Second law

Answer 182

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

Answer 183

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

Answer 184

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

Answer 185

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

Answer 186

Glass Calorimeter

Answer 187

Thermometer

Answer 188

Bomb Calorimeter

Answer 189

It is not irreversible

Answer 190

It is reversible

Answer 191

None of these

Answer 192

It is irreversible

Answer 193

Endothermic

Answer 194

Photochemical

Answer 195

Exothermic

Answer 196

Thermodynamics

Answer 197

Stoichiometry

Answer 198

Thermochemistry

Answer 199

Heat is evolved

Answer 200

Heat is converted into mechanical work

Answer 201

Heat is converted into electricity

Answer 202

Heat is absorbed

Answer 203

Hess’s law

Answer 204

Charles’s law

Answer 205

Graham’s law

Answer 206

Henry’s law

Answer 207

Exothermic

Answer 208

Non-spontaneous

Answer 209

Spontaneous

Answer 210

Endothermic

Answer 211

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

Answer 212

Dissolution on NH₄Cl in excess of water is an endothermic process

Answer 213

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

Answer 214

Neutralization is always exothermic

Answer 215

+64.8 kcal mol¯¹

Answer 216

+21.4 kcal mol¯¹

Answer 217

-231.6 kcal mol¯¹

Answer 218

-94.0 kcal mol¯¹

Answer 219

– 68 – 48 + 14

Answer 220

68 – 48 + 14

Answer 221

68 + 48 + 14

Answer 222

– 68 + 48 – 14

Answer 223

Both a and b

Answer 224

Exothermic

Answer 225

Endothermic

Answer 226

Exothermic

Answer 227

Endothermic

Answer 228

Both a and b

Answer 229

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

Answer 230

The energy change in a cyclic process is not zero

Answer 231

Born Haber cycle is different from Hess’s law

Answer 232

The lattice energy of the crystalline substances can be calculated easily

Answer 233

Thermodynamics

Answer 234

Thermochemistry

Answer 235

Photochemistry

Answer 236

Remains same

Answer 237

Remains constant

Answer 238

The sum of all motions which are possible

Answer 239

Rotational motion

Answer 240

Translational motion

Answer 241

Vibrational motion

Answer 242

Temperature should be low

Answer 243

Temperature should be zero

Answer 244

Temperature should be high

Answer 245

Temperature has no effect

Answer 246

∆H = ∆E + d

Answer 247

∆H = ∆E – PV

Answer 248

∆H = ∆E + Pv

Answer 249

∆H = ∆E – d

Answer 250

P.E + mechanical energy

Answer 251

K.E + heat energy

Answer 252

P.E + heat energy

Answer 253

Surrounding

Answer 254

State function

Answer 255

Non spontaneous

Answer 256

Irreversible process

Answer 257

None of these

Answer 258

Spontaneous process

Answer 259

Endothermic process

Answer 260

Chemical process

Answer 261

Physical process

Answer 262

Biochemical process

Answer 263

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

Answer 264

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

Answer 265

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

Answer 266

Work done is independent of its path

Answer 267

Heat of neutralization

Answer 268

Heat of reaction

Answer 269

Heat of combustion

Answer 270

Heat of sublimation

Answer 271

Thermodynamics

Answer 272

Thermochemistry

Answer 273

Chemical kinetics

Answer 274

112 kJ mol¯¹

Answer 275

668 kJ mol¯¹

Answer 276

-112 kJ mol¯¹

Answer 277

-668 kJ mol¯¹

Answer 278

Non-spontaneous

Answer 279

Spontaneous

Answer 280

Exothermic

Answer 281

Endothermic

Answer 282

Pressure and volume

Answer 283

Heat and volume

Answer 284

Heat and work

Answer 285

Pressure and temperature

Answer 286

Gibbs free energy

Answer 287

Internal energy

Answer 288

Spontaneous

Answer 289

Non-spontaneous

Answer 290

Endothermic

Answer 291

Exothermic

Answer 292

None of these

Answer 293

Not change

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