Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. The relative lowering of vapour pressure is equal to mole fraction of the solute. This law is called:

Answer

Arrhenius law

Answer

Henry’s law

Answer

Raoult’s law

Answer

Ostwald’s law

Question 2

2. Of the following, the metal that cannot be obtained by electrolysis of aqueous solution of their salts are:

Question 3

3. Corrosion is basically a

Answer

Altered reaction in presence of H₂O

Answer

Interaction

Answer

Union between two light metals and a heavy metal

Answer

Electrochemical phenomenon

Question 4

4. A solution contains 1.2046 x 10²⁴ hydrochloric acid molecules in one dm³ of the solution. The strength of the solution is

Question 5

5. In a solution of CuSO₄ how much time will be required to precipitate 2g copper by 0.5 ampere current?

Answer

12157.48 sec

Question 6

6. The art of electroplating was given by

Answer

Thomas Gradam

Question 7

7. Density of H₂SO₄ in lead accumulator is

Question 8

8. In electrolytic cell, electricity in carried out by

Answer

Non-spontaneous reaction

Answer

Neutralization

Answer

Spontaneous reaction

Question 9

9. If 5.85 g of NaCl are dissolved in 90 g of water, the mole fraction of NaCl is

Question 10

10. Salt bridge transfers

Question 11

11. When molten sodium undergoes electrolysis, the ion reduces is

Answer

Both Na⁺ and CI¯

Answer

None of these

Question 12

12. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 13

13. Which of the following statements is FALSE?

Answer

All electrochemical reactions involve the transfer of electrons

Answer

Oxidation and reduction half-reactions occur at electrodes in electrochemical cells.

Answer

All voltaic (galvanic) cells involve the use of electricity to initiate nonspontaneous chemical reactions

Answer

Reduction occurs at cathode

Question 14

14. In a chemical reaction, oxidation process involves

Answer

Increase in oxidation number of the elements in reactants

Answer

Decrease in oxidation number of element

Answer

Increase in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Question 15

15. Which of the following solution of H₂SO₄ is more concentrated?

Question 16

16. In an electrolytic cell current flows

Answer

From cathode to anode in outer circuit

Answer

From anode to cathode in an outer circuit

Answer

From cathode to anode inside the cell

Answer

From anode to cathode inside the cell

Question 17

17. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 18

18. An aqueous solution of ethanol in water has vapour pressure

Answer

More than that of H₂O

Answer

Equal to that of ethanol

Answer

Less than that of water

Answer

Equal to that of water

Question 19

19. Which of the following is the use of electrolysis?

Answer

None of these

Answer

Electrorefining

Answer

Electroplating

Answer

Both A and B

Question 20

20. Density of H₂SO₄ in lead accumulator is

Answer

120 g Cm³

Answer

1.15 g/Cm³

Answer

1.25g/Cm³

Answer

1.2 g/Cm³

Question 21

21. The depression of freezing point is directly proportional to

Answer

Molarity of the solvent

Answer

Molarity of the solution

Answer

Molality of the solution

Answer

Mole fraction of the solution

Question 22

22. Mole fraction of pure water is

Answer

Exactly equal to one

Answer

Slightly less than one

Answer

None of these

Answer

Slightly greater than one

Question 23

23. Electricity in voltaic cell is produced due to

Answer

Neutralization

Question 24

24. Calculate the percentage by weight if NaCl, if 2.0 g of NaCl is dissolved in 20g of water

Question 25

25. The molarity of the solution containing x grams (NH₄)SO₄ in 500 cm³ of the solution is 0.6. What is x

Question 26

26. Calculate the amount of charge flowing in 2 minute in a wire of resistance 10 Ω when a potential difference of 20 V is applied

Question 27

27. A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

Question 28

28. What is the molality of a solution prepared by dissolving 5 g of toluene in 250 g of Benzene.

Question 29

29. Which of the following statement is correct for electrolytic cell?

Answer

None of these

Answer

Electrons flow from cathode to anode through the external battery

Answer

Electrons flow cathode to anode within the electrolytic solution

Answer

Migration of ions along with oxidation reaction at anode and reduction reaction at cathode

Question 30

30. If 18 g of glucose (C₆H₁₂C₆) is present in 1000 g of an aqueous solution of glucose it is said to be

Question 31

31. Best way to prevent rusting iron is by

Answer

Making iron cathode

Answer

Both of these

Answer

None of these

Answer

Putting it in saline water

Question 32

32. Partial pressure of a solution component is directly proportional to its mole fraction. This statement is known as

Answer

Henry’s law

Answer

Raoult’s law

Answer

Ostwald’s dilution law

Answer

Distribution law

Question 33

33. The solubility of a gas in water depends upon

Answer

All of these

Answer

Temperature

Answer

Pressure of the gas

Answer

Nature of the gas

Question 34

34. The osmotic pressure of a dilute solution is directly proportional to the

Answer

Diffusion rate of the solute

Answer

Flow of solvent from a concentrated to a dilute solution

Answer

Elevation in boiling point

Answer

Ionic concentration

Question 35

35. Temperature for standard electrode potential is

Question 36

36. In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

Answer

Generate heat

Answer

Create potential difference between two electrodes

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Produce high purity water

Question 37

37. Corrosion reactions are

Answer

Non-spontaneous redox reactions

Answer

None of these

Answer

Spontaneous acid–base reactions

Answer

Spontaneous redox reactions

Question 38

38. Standard reduction electrode potential of three metals A, B and C are respectively + 0.05 V, - 3.0 and -1.2V. The reducing power of

Question 39

39. Pick out the wrong statement. In electrochemical cell

Answer

Electrons are released at anode

Answer

Salt bridge maintains the electrical neutrality of the solution

Answer

Chemical energy is converted into electrical energy

Answer

Cathode is regarded as negative electrode

Question 40

40. The substance having highest conductivity at room temperature among the following is

Answer

0.1 N NaCl

Question 41

41. When a metal is dipped in 1 molar of its solution at 298k, then potential set up is called

Answer

Standard electrode potential

Answer

Ionization potential

Answer

Electric change

Answer

Electroplating

Question 42

42. A smuggler could not carry gold by chemically depositing iron on the gold surface since

Answer

Gold is denser

Answer

Iron rusts

Answer

Gold has lower reduction potential then iron

Answer

Gold has higher reduction potential then iron

Question 43

43. A redox reaction involves

Answer

Ion combination reaction

Answer

A reaction in a solution

Answer

Proton transfer

Answer

Electron transfer

Question 44

44. Which of the following is a strong electrolyte?

Answer

Ca(NO₃)₂

Question 45

45. Specific conductivity of a solution

Answer

Increases with dilution

Answer

Remains unchanged with dilution

Answer

Depends on mass of electrolyte

Answer

Decreases with dilution

Question 46

46. A device which converts electrical energy into chemical energy is called

Answer

An electrolytic cell

Answer

A galvanic cell

Answer

A chemical cell

Answer

A voltaic cell

Question 47

47. The specific conductance of 0.1 M NaCl solution is 1.06 x 10¯² ohm¯¹mol¯¹. Its molar conductance in ohm¯¹ cm² mol¯¹ is

Answer

1.06 x 10⁴

Answer

1.06 x 10³

Answer

1.06 x 10²

Question 48

48. When common salt is dissolved in water

Answer

Any possibility

Answer

B.P of water increase

Answer

B.P of water decrease

Answer

B.P of water remain constant

Question 49

49. The pressure at which water boils at 101.5 °c is

Answer

Slightly more than 1 atom

Answer

760 mm of Hg

Question 50

50. An electrolyte

Answer

Possesses ions even in solid state

Answer

Forms complex ions in solution

Answer

Gives ions only when dissolved in water

Answer

Gives ions only when electricity is passed

Question 51

51. How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

Question 52

52. If a salt bridge is removed between the two half cells, the voltage

Answer

Drops to zero

Answer

Increases rapidly

Answer

Does not change

Answer

Increases gradually

Question 53

53. Alkaline battery has a voltage of

Question 54

54. When Cu, Ag, Au and Pt are reacted with acids, these metals do not liberate hydrogen, this is due to the reason that

Answer

Very low ionization potential values

Answer

Very high negative values reduction potential

Answer

Reduction potentials are negative

Answer

Very high positive value of reduction potential

Question 55

55. The reference calomel electrode is made from which of the following?

Answer

Hg₂Cl₂

Question 56

56. The temperature at which the vapour pressure of a liquid becomes equal to external pressure is

Answer

Boiling point

Answer

Sublimation point

Answer

Inversion point

Answer

Melting point

Question 57

57. The ionic strength of a solution containing 0.1 mole/kg of KCl and 0.2 mole/kg of CuSO₄ is

Question 58

58. Choose the cell among the following list in which conversation of electrical energy into chemical energy takes place

Answer

Galvanic cell

Answer

Daniel cell

Answer

Electrolytic cell

Question 59

59. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 60

60. A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

Question 61

61. Prevention of corrosion of iron by Zn coating is called

Answer

Galvanization

Answer

Cathodic protection

Answer

Electrolysis

Answer

Photo electrolysis

Question 62

62. Same amount of electric current is passed through solution if AgNO₃ and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P. in the second case is:

Answer

22400 cm³

Question 63

63. Oxidation number of carbon in NaHCO₃ is

Question 64

64. In alkaline battery the anode is made up of

Answer 139

None of these

Answer 140

One gm. Equivalent weight

Answer 141

One gm. atomic weight

Answer 142

Electrochemical equivalent

Answer 143

Chemical energy is converted into electricity

Answer 144

Chemical energy is converted into heat

Answer 145

Electrical energy is converted into chemical energy

Answer 146

Electrical energy is converted into heat

Answer 147

Does not change

Answer 148

Decreases slowly

Answer 149

Drops to zero

Answer 150

Decrease rapidly

Answer 151

Cathode to anode through the solution

Answer 152

Anode to cathode through the solution

Answer 153

Cathode to anode through the external circuit

Answer 154

Anode to cathode through the external circuit

Answer 155

Neither oxidation and reduction

Answer 156

Both oxidation and reduction

Answer 157

Electroplating

Answer 158

Electrolysis

Answer 159

Conduction

Answer 160

1 – 2 α

Answer 161

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 162

Boiling point of pure water decreases by the addition of ethanol

Answer 163

Vapour pressure of pure water decreases by the addition of nitric acid

Answer 164

Boiling point of pure benzene increases by the addition of toluene

Answer 165

Parts per million

Answer 166

Milligram percent

Answer 167

Gram per million

Answer 168

Microgram percent

Answer 169

None of these

Answer 170

Solvent particles

Answer 171

None of these

Answer 172

Both A and B

Answer 173

At cathode

Answer 174

CH₃ CooNH₄

Answer 175

Na₂SO₄

Answer 176

S m mol¯¹

Answer 177

S m² mol¯¹

Answer 178

S² m² mol¯²

Answer 179

S² m² mol

Answer 180

Gains electrons

Answer 181

Loses electrons

Answer 182

Is hydrolysed

Answer 183

Is oxidized

Answer 184

None of these

Answer 185

Not particular

Answer 186

Ohm¯¹ cm

Answer 187

Ohm cm¯²

Answer 188

Ohm¯¹ cm¯¹

Answer 189

Ohm cm¯¹

Answer 190

Hg₂Cl₂

Answer 191

Na, Pt and graphite

Answer 192

Pt and graphite only

Answer 193

Na and S only

Answer 194

H₄P₃O₇

Answer 195

2Br– → Br₂ + 2e –

Answer 196

Na → Na⁺ + e–

Answer 197

Br₂ + 2e – → 2Br –

Answer 198

Na⁺ + e– → Na

Answer 199

1.15 cm¯³

Answer 200

2.15 cm¯³

Answer 201

1.81 cm¯³

Answer 202

1.25 cm¯³

Answer 203

The free energy as well as the entropy of mixing are each zero

Answer 204

The enthalpy of mixing is zero

Answer 205

The free energy of mixing is zero

Answer 206

The entropy of mixing is zero

Answer 207

Both a and b

Answer 208

Concentration solutions behave as nearly non – ideal solutions

Answer 209

Neither a nor b

Answer 210

Dilute solution which behave as nearly ideal solution

Answer 211

None of these

Answer 212

O₂, SO₂

Answer 213

It has not potential

Answer 214

760 mm of Hg

Answer 215

800 mm of Hg

Answer 216

750 mm of Hg

Answer 217

780 mm of Hg

Answer 218

Phosphorus acid

Answer 219

Sulphuric acid

Answer 220

Nitric acid

Answer 221

Boric acid

Answer 222

Oxidation potential

Answer 223

e.m.f of cell

Answer 224

Redox potential

Answer 225

Reduction potential

Answer 226

Dilute solution of glucose

Answer 227

Chloroform

Answer 228

Pure distilled water

Answer 229

Molten NaCl

Answer 230

Weak acid and its salt of weak base

Answer 231

Strong acid and its salt of weak base

Answer 232

Weak acid and its salt of strong base

Answer 233

A strong acid and its salt of a strong base

Answer 234

5.58g NaCl/100m

Answer 235

10.0g NaCl/100ml

Answer 236

58.5g NaCl/100ml

Answer 237

20g NaCl/100ml

Answer 238

Hg is more inert than Pt

Answer 239

More voltage is required to reduce H⁺ at Hg than at Pt

Answer 240

Conc. Of H⁺ ions is when Pt electrode is taken

Answer 241

Na is dissolved in Hg while it does not dissolve in Pt

Answer 242

∆ G = +ve, ∆ E = 0

Answer 243

∆ G = -ve

Answer 244

∆ G = -ve, ∆ E = 0

Answer 245

∆ G = 0, ∆E = 0

Answer 246

Does not change on dilution

Answer 247

Decreases on dilution

Answer 248

Depends on density of electrolyte itself.

Answer 249

Increases on dilution slightly

Answer 250

Naphthalene

Answer 251

Refractive index

Answer 252

Surface tension

Answer 253

Osmotic pressure

Answer 254

Degree of solubilization of solute

Answer 255

The degree of decomposition of solution

Answer 256

The extent of dissociation of solute

Answer 257

The extent of dissolution of solute

Answer 258

Has low boiling point

Answer 259

Is readily decomposed

Answer 260

Is neutral

Answer 261

Is almost unionized

Answer 262

Precipitated

Answer 263

Hydrolyzed

Answer 264

It is readily available

Answer 265

It is volatile

Answer 266

It has a very high cryoscopic constant

Answer 267

It is solvent for organic substances

Answer 268

By replacing external circuit with external source of electricity

Answer 269

By removal of solution

Answer 270

By heating it

Answer 271

By addition of fresh solution

Answer 272

Equal to the total volume of the components

Answer 273

None of these

Answer 274

Slightly more than the total volume of the components

Answer 275

Slightly less than the total volume of the components

Answer 276

Pressure increases

Answer 277

Dilution increases

Answer 278

Dilution decreases

Answer 279

Neutral atom

Answer 280

Does not provide any electron

Answer 281

0.1 M Glucose

Answer 282

0.1 M NaCl

Answer 283

0.1 M Sucrose

Answer 284

0.1 M BaCl₂

Answer 285

Decrease in oxidation number

Answer 286

Both are possible

Answer 287

Increase in oxidation number of all the elements on reactant side

Answer 288

Increase in oxidation number

Answer 289

In metals the ions are free to more

Answer 290

Metals have high resistance

Answer 291

They are mobile electrons in the metallic structure

Answer 292

Metals are decomposed by current

Answer 293

H+ and OH-

Answer 294

None of these

Answer 295

Heat energy

Answer 296

Sound energy

Answer 297

Magnetic energy

Answer 298

Electrical energy

Answer 299

278 S cm² mol¯¹

Answer 300

302 S cm² mol¯¹

Answer 301

176 S cm² mol¯¹

Answer 302

128 S cm² mol¯¹

Answer 303

All of these

Answer 304

Depends on the nature of the coupled electrode

Answer 305

Oxidation-reduction

Answer 306

Supersaturated

Answer 307

Unsaturated

Answer 308

2.0 x 10¹¹

Answer 309

1.0 x 10¹⁰

Answer 310

4.0 x 10¹²

Answer 311

1.0 x 10²

Answer 312

Free electrons

Answer 313

Atoms of Na and Cl.

Answer 314

Free molecules

Answer 315

– 1.17 V

Answer 316

– 0.35 V

Answer 317

63.5 g of Cu

Answer 318

96500 g of CU

Answer 319

31.75 g of Cu

Answer 320

100 g of Cu

Answer 321

Ionization potential

Answer 322

Cell voltage

Answer 323

Standard oxidation potential

Answer 324

Standard reduction potential

Answer 325

Manufacture of bleach

Answer 326

Rust removal

Answer 327

Electroplating

Answer 328

Making leather

Answer 329

Sum of reduction and oxidation potentials

Answer 330

Greater positive value of standard reduction potential

Answer 331

None of these

Answer 332

Lesser positive value of standard reduction potential

Answer 333

Greater negative value of standard reduction potential

Answer 334

Galvanic cell

Answer 335

Electrolytic cell

Answer 336

Hydrolysis

Answer 337

Ionization

Answer 338

The standard reduction potential of Cu²+/Cu is lower than that of Li⁺/Li

Answer 339

The standard oxidation potential of Li/Li⁺ is lower than that of CuCu²⁺

Answer 340

The standard reduction potential of Li⁺/Li is lower than that of Cu²+/Cu

Answer 341

Li is smaller in size as compared to Cu

Answer 342

Fractional distillation

Answer 343

Vacuum distillation

Answer 344

Distillation

Answer 345

None of these

Answer 346

[Pt(NH₃)₄Cl₃]Cl

Answer 347

[Pt(NH₃)₄Cl₂]Cl₂

Answer 348

[Pt(NH₃)₄Cl]Cl₃

Answer 349

[Pt(NH₃)₄Cl₄]

Answer 350

Non rechargeable

Answer 351

Daniel cell

Answer 352

Rechargeable

Answer 353

Electrolytic cell

Answer 354

No connection exists

Answer 355

Salt Bridge

Answer 356

Electric circuit

Answer 357

Sufficient date not given

Answer 358

Electrical energy

Answer 359

Heat energy

Answer 360

Chemical energy

Answer 361

None of these

Answer 362

pH is changed

Answer 363

Loses electrons

Answer 364

Gains electrons

Answer 365

Acts as a catalyst

Answer 366

0.66 cm¯¹

Answer 367

0.142 cm¯¹

Answer 368

1.12 cm¯¹

Answer 369

0.918 cm¯¹

Total Questions:	192
Time Allowed:	60 Minutes
Total Marks:	192
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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