Thermo-Chemistry Online Mcqs Test

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Question 1

1. If internal energy of the system is increased

Answer

Temperature of the system may rise

Answer

Chemical reaction may take place

Answer

Change in state of the system is increased

Question 2

2. Unit of heat in S.I system is

Question 3

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

Answer

Heat of sublimation

Answer

Heat of neutralization

Answer

Heat of combustion

Answer

Heat of reaction

Question 4

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

Answer

Henry’s law

Answer

Boyle’s law

Answer

Hess’s law

Answer

Graham’s law

Question 5

5. Two fundamental ways to transfer energy are

Answer

Heat and volume

Answer

Pressure and volume

Answer

Heat and work

Answer

Pressure and temperature

Question 6

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

Answer

State function

Answer

Any substance

Answer

Surrounding

Question 7

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

Answer

Temperature

Question 10

10. 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 11

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

Question 12

12. Most of the thermodynamic parameters are

Answer

State function

Answer

Surrounding

Question 13

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

Answer

Glass calorimeter

Answer

Bomb calorimeter

Answer

Copper calorimeter

Question 14

14. Reaction in which heat is evolved

Answer

Spontaneous

Answer

Non-spontaneous

Answer

Endothermic

Answer

Exothermic

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. 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 17

17. 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 freeze

Answer

Ice will melt

Answer

Water will vaporize

Question 18

18. Pumping of water uphill is

Answer

None of these

Answer

Non spontaneous

Answer

Irreversible process

Answer

Spontaneous process

Question 19

19. The law of Lavoisier and Laplace illustrates

Answer

The principle of conservation of matter

Answer

Equivalent of mechanical and chemical energy

Answer

Equivalence of mechanical and thermal energy

Answer

The principle of conservation of energy

Question 20

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

Answer

Graphite has more energy than diamond

Answer

Both are equally stable

Answer

Stability cannot to predicated

Answer

Graphite is more stable than diamond

Question 21

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

Answer

Henry’s law

Answer

Hess’s law

Answer

Charles’s law

Answer

Graham’s law

Question 22

22. Total energy depends upon the state of system

Answer

Entropy of reaction

Answer

Free energy of reaction

Question 23

23. Hess’s law deals with

Answer

Rate of reaction

Answer

Equilibrium constant

Answer

Changes in heat or reaction

Answer

Influence of pressure on volume of a gas

Question 24

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

Answer

Exothermic

Answer

Both a and b

Answer

Endothermic

Question 25

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

Question 26

26. Which type of reactions cannot occur spontaneously?

Answer

Endothermic

Answer

Both a and b

Answer

Exothermic

Question 27

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

Answer

Surrounding

Question 28

28. Unit of heat is SI system is

Question 29

29. 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

71030 calories

Answer

70960 calories

Question 30

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

Question 31

31. 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 32

32. 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 33

33. All of the following are state function except

Question 34

34. 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 35

35. 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 36

36. 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

Absorption of 218 kcal of energy

Answer

Release of 218 kcal of energy

Answer

Unpredictable

Question 37

37. 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 38

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

Answer

Not change

Answer

None of these

Question 39

39. 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

Insufficient data

Answer

9.75 JK¯¹

Answer

11.272 JK¯¹

Question 40

40. Which of the following is not correct?

Answer

Neutralization is always exothermic

Answer

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

Answer

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

Answer

Dissolution on NH₄Cl in excess of water is an endothermic process

Question 41

41. Free energy change for a reversible process is:

Answer

Equal to zero

Answer

Unpredictable

Question 42

42. 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 combustion

Answer

Hat of formation

Answer

Heat of neutralization

Question 43

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

Answer

Pressure and volume

Answer

Energy and volume

Answer

Temperature and volume

Answer

Temperature and pressure

Question 44

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

Answer

∆H = ∆E + d

Answer

∆H = ∆E – d

Answer

∆H = ∆E – PV

Answer

∆H = ∆E + Pv

Question 45

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

Answer

Exothermic

Answer

Endothermic

Answer

Non-spontaneous

Answer

Spontaneous

Question 46

46. Total energy of a system is

Answer

P.E + heat energy

Answer

P.E + mechanical energy

Answer

K.E + heat energy

Question 47

47. For a reaction to occur spontaneously

Answer

∆ H must be unity

Answer

∆ H must be positive

Answer

∆ H must be zero

Answer

∆ H must be negative

Question 48

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

Answer

Bomb Calorimeter

Answer

Thermometer

Answer

Glass Calorimeter

Question 49

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

Question 50

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

Answer

+21.4 kcal mol¯¹

Answer

+64.8 kcal mol¯¹

Answer

-231.6 kcal mol¯¹

Answer

-94.0 kcal mol¯¹

Question 51

51. 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

Question 52

52. 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

Spontaneous

Answer

Reversible

Question 53

53. Mechanical work is especially important in systems that contain

Answer

Liquid-liquid

Answer

Solid-liquid

Answer

Solid-solid

Question 54

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

Answer

Electron – volt

Question 55

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

Answer

Bond strength

Answer

Bond energy

Answer

Bond length

Answer

None of these

Question 56

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

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

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

Question 57

57. Endothermic changes are indicated through

Answer

Breaking of chemical bonds

Answer

All of these

Answer

Burning of carbon

Answer

Making of chemical bond

Question 58

58. If internal energy of a system is increased

Answer

Temperature of the system may rise

Answer

Chemical reaction can take place

Answer

Change in state of system can occur

Question 59

59. 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 60

60. Which one is not state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 61

61. Which one is not a state function?

Answer

Gibbs free energy

Answer

Internal energy

Question 62

62. 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 63

63. 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

395 KJ/mole

Answer

386 KJ/mole

Answer

-27 KJ/mole

Question 64

64. Which statement describes characteristics of an endothermic reaction?

Answer

The sign of H is negative, 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

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 167

Electron vol

Answer 168

Electron – volt

Answer 169

Both a and b

Answer 170

Decomposition

Answer 171

Exothermic

Answer 172

Endothermic

Answer 173

None of these

Answer 174

Isothermal

Answer 175

Endothermic

Answer 176

Exothermic

Answer 177

112 kJ mol¯¹

Answer 178

-112 kJ mol¯¹

Answer 179

-668 kJ mol¯¹

Answer 180

668 kJ mol¯¹

Answer 181

Increase of enthalpy

Answer 182

Decrease of entropy

Answer 183

Decrease of free energy

Answer 184

Increase of free energy

Answer 185

Water equivalent

Answer 186

Thermal capacity

Answer 187

None of these

Answer 188

Specific heat

Answer 189

68 – 48 + 14

Answer 190

68 + 48 + 14

Answer 191

– 68 + 48 – 14

Answer 192

– 68 – 48 + 14

Answer 193

Second law

Answer 194

Zeroth law

Answer 195

Thermodynamics

Answer 196

Thermochemistry

Answer 197

Photochemistry

Answer 198

Thermal decomposition

Answer 199

Neutralization

Answer 200

Respiration

Answer 201

Combustion

Answer 202

An endothermic change

Answer 203

An exothermic change

Answer 204

A process where no heat changes occur

Answer 205

A process accompanied by chemical reaction

Answer 206

Stoichiometry

Answer 207

Thermochemistry

Answer 208

Thermodynamics

Answer 209

-523.3 kJ mol¯¹

Answer 210

-339.3 kJ mol¯¹

Answer 211

-221.1 kJ mol¯¹

Answer 212

-439.3 kJ mol¯¹

Answer 213

Non-spontaneous

Answer 214

Spontaneous

Answer 215

Endothermic

Answer 216

Exothermic

Answer 217

Entropy change

Answer 218

Enthalpy change

Answer 219

Free energy change

Answer 220

Internal energy change

Answer 221

Joule deg¯¹ atom¯¹

Answer 222

Joule cm¯¹ deg¯¹

Answer 223

Joule deg¯¹ Kg¯¹

Answer 224

Joule deg¯¹ mol¯¹

Answer 225

Endothermic process

Answer 226

Biochemical process

Answer 227

Chemical process

Answer 228

Physical process

Answer 229

Heat is absorbed

Answer 230

No change in heat contents takes place

Answer 231

Temperature increases

Answer 232

Heat is evolved

Answer 233

Photochemical

Answer 234

Endothermic

Answer 235

Exothermic

Answer 236

An increase in internal energy

Answer 237

A lowering of free energy

Answer 238

No energy change

Answer 239

A lowering of energy

Answer 240

Pressure and volume

Answer 241

Heat and volume

Answer 242

Heat and work

Answer 243

Pressure and temperature

Answer 244

Heat is converted into mechanical work

Answer 245

Heat is converted into electricity

Answer 246

Heat is evolved

Answer 247

Heat is absorbed

Answer 248

Temperature should be low

Answer 249

Temperature should be zero

Answer 250

Temperature should be high

Answer 251

Temperature has no effect

Answer 252

It has a large – ve value for the entropy change

Answer 253

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

Answer 254

It has small + ve value for enthalpy change

Answer 255

It has a large + ve value for enthalpy change

Answer 256

None of these

Answer 257

It is reversible

Answer 258

None of these

Answer 259

It is irreversible

Answer 260

It is not irreversible

Answer 261

Glass calorimeter

Answer 262

Thermometer

Answer 263

∆H = ∆E + P∆V

Answer 264

∆E = q + w

Answer 265

Q = m x X x ∆ T

Answer 266

P∆V + nRT

Answer 267

K.E, + heat energy

Answer 268

P.E, + K.E.

Answer 269

P.E, + mechanical energy

Answer 270

P.E. + heat energy

Answer 271

Energy of the system

Answer 272

Physical property

Answer 273

State function

Answer 274

Chemical property

Answer 275

3 kg H₂O

Answer 276

2 kg H₂O

Answer 277

4 kg H₂O

Answer 278

1 kg H₂O

Answer 279

Isothermal

Answer 280

Decrease in temperature

Answer 281

2x – y/2

Answer 282

Y – 2x/2

Answer 283

Products is more than that of reactants

Answer 284

Reactants and products are equal

Answer 285

Both a and b

Answer 286

Reactants is more than that of products

Answer 287

Chemical kinetics

Answer 288

Thermochemistry

Answer 289

Thermodynamics

Answer 290

The sum of all motions which are possible

Answer 291

Rotational motion

Answer 292

Vibrational motion

Answer 293

Translational motion

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