Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. The number of coulombs required for the deposition of 107.870 g of silver is

Question 2

2. A solution of sodium sulphate was electrolyzed using some inert electrodes. The products at the electrodes are

Answer

None of these

Answer

O₂, SO₂

Question 3

3. The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm¯¹ cm¯¹. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

Answer

1.12 cm¯¹

Answer

0.918 cm¯¹

Answer

0.66 cm¯¹

Answer

0.142 cm¯¹

Question 4

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

Answer

A voltaic cell

Answer

A chemical cell

Answer

A galvanic cell

Answer

An electrolytic cell

Question 5

5. Reaction takes place at anode is

Answer

Ionization

Answer

Hydrolysis

Question 6

6. Hydrogen gas is not liberated when the following metal is added to dil. HCI.

Question 7

7. 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 8

8. For spontaneity of a cell, which is correct?

Answer

∆ G = -ve

Answer

∆ G = +ve, ∆ E = 0

Answer

∆ G = 0, ∆E = 0

Answer

∆ G = -ve, ∆ E = 0

Question 9

9. Pure water does not conduct electricity because it

Answer

Is almost unionized

Answer

Is neutral

Answer

Is readily decomposed

Answer

Has low boiling point

Question 10

10. What is the molarity of H₂SO₄ solution that has density of 1.84 gm/cm³ which was at 35°C and contains 98% by weight?

Question 11

11. Molarity of water is

Question 12

12. Metals usually conduct electricity because

Answer

Metals have high resistance

Answer

Metals are decomposed by current

Answer

They are mobile electrons in the metallic structure

Answer

In metals the ions are free to more

Question 13

13. Chemical used in salt bridge is

Question 14

14. Which one of the following substance when dissolved in water give acidic solution

Answer

CH₃ CooNH₄

Answer

Na₂SO₄

Question 15

15. Oxidation in a chemical reaction involves

Answer

Increase in oxidation number

Answer

Decrease in oxidation number

Answer

Increase in oxidation number of all the elements on reactant side

Answer

Both are possible

Question 16

16. 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 17

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

Answer

Hg₂Cl₂

Question 18

18. Potential of Zn is called

Answer

It has not potential

Question 19

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

Answer

Produce high purity water

Answer

Create potential difference between two electrodes

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Generate heat

Question 20

20. Which of the following (IM) conducts more electricity?

Answer

Nitric acid

Answer

Sulphuric acid

Answer

Boric acid

Answer

Phosphorus acid

Question 21

21. In a Galvanic cell

Answer

Electrical energy is converted into chemical energy

Answer

Electrical energy is converted into heat

Answer

Chemical energy is converted into electricity

Answer

Chemical energy is converted into heat

Question 22

22. In a Galvanic cell, the electrons flow from

Answer

Cathode to anode through the solution

Answer

Anode to cathode through the external circuit

Answer

Anode to cathode through the solution

Answer

Cathode to anode through the external circuit

Question 23

23. Which one of the following will be good conductor of electricity?

Answer

Chloroform

Answer

Pure distilled water

Answer

Molten NaCl

Answer

Dilute solution of glucose

Question 24

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

Answer

Raoult’s law

Answer

Distribution law

Answer

Henry’s law

Answer

Ostwald’s dilution law

Question 25

25. Decrease in oxidation number is called

Answer

All of these

Question 26

26. A dry alkaline cell has porous Zn anode & MnO₂ as cathode the electrolyte used is

Question 27

27. If the salt bridge is not used between two half cells, then the voltage

Answer

Drops to zero

Answer

Decreases slowly

Answer

Does not change

Answer

Decrease rapidly

Question 28

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

Question 29

29. Electrochemical series is a list of elements arranged into increasing order to either

Answer

Standard reduction potential

Answer

Standard oxidation potential

Answer

Ionization potential

Answer

Cell voltage

Question 30

30. Azeotropic mixture of HCl and water has

Question 31

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

Answer

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

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

Question 32

32. Specific conductivity of a solution

Answer

Decreases with dilution

Answer

Depends on mass of electrolyte

Answer

Remains unchanged with dilution

Answer

Increases with dilution

Question 33

33. The limiting molar conductivities ʌ’ for NaCl, KBr and KCl are 126, 152 and 150 S cm² respectively. The ʌ’ for NaBr is

Answer

128 S cm² mol¯¹

Answer

278 S cm² mol¯¹

Answer

176 S cm² mol¯¹

Answer

302 S cm² mol¯¹

Question 34

34. Salt bridge transfers

Question 35

35. 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 36

36. Wen quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

Answer

One gm. Equivalent weight

Answer

None of these

Answer

One gm. atomic weight

Answer

Electrochemical equivalent

Question 37

37. If α is the degree of dissociation of Na₂SO₄ the Vant Hoff’s factor (i) used for calculating the molecular mass is

Answer

1 – 2 α

Question 38

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

Question 39

39. In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam

Answer

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

Answer

Hg is more inert than Pt

Answer

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

Answer

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

Question 40

40. Electricity in voltaic cell is produced due to

Answer

Neutralization

Question 41

41. Cathode provides electrons to

Answer

Neutral atom

Answer

Does not provide any electron

Question 42

42. Which oxide has +2 oxidation number of oxygen?

Question 43

43. Pick out the wrong statement. In electrochemical cell

Answer

Salt bridge maintains the electrical neutrality of the solution

Answer

Cathode is regarded as negative electrode

Answer

Electrons are released at anode

Answer

Chemical energy is converted into electrical energy

Question 44

44. The equivalent conductivity of 0.1 M week acid is 100 times less than that at infinite dilution. The degree of dissociation is

Question 45

45. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 46

46. In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be

Answer

Sum of reduction and oxidation potentials

Question 47

47. A cell in which chemical energy is converted into electrical energy is called

Answer

Electrolytic cell

Answer

Galvanic cell

Question 48

48. Which of the following will have the highest boiling point at 1 atm pressure?

Answer

0.1 M NaCl

Answer

0.1 M BaCl₂

Answer

0.1 M Glucose

Answer

0.1 M Sucrose

Question 49

49. The volume of 0.1 M H₂SO₄ required to neutralize completely 40 ml of 0.2 M NaOH solution is

Question 50

50. Temperature for standard electrode potential is

Question 51

51. In alkaline battery the anode is made up of

Question 52

52. Reduction always occurs

Answer

Both A and B

Answer

At cathode

Answer

None of these

Question 53

53. 8 g of NaOh is dissolved in 500 cm³ of solution, its molarity is:

Question 54

54. A solution contains A, B and C components. The mole fraction A and C are 0.25 and 0.35 respectively. The mole fraction B will be

Question 55

55. Salt bridge transfers

Answer

Solvent particles

Question 56

56. Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed. The concentration of NO¯₃ ions in the mixture will be

Question 57

57. The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be

Answer

2.0 x 10¹¹

Answer

1.0 x 10¹⁰

Answer

1.0 x 10²

Answer

4.0 x 10¹²

Question 58

58. Choose the best reducing agent among the following

Question 59

59. Which of these is not an application of electrolysis?

Answer

Manufacture of bleach

Answer

Making leather

Answer

Rust removal

Answer

Electroplating

Question 60

60. Which of the following element act as inert electrode?

Question 61

61. Mole fraction of pure water is

Answer

Slightly greater than one

Answer

Exactly equal to one

Answer

Slightly less than one

Answer

None of these

Question 62

62. The + 1 oxidation state of P is found in

Answer

H₄P₃O₇

Question 63

63. In electrolytic cell, electricity in carried out by

Answer

Neutralization

Answer

Spontaneous reaction

Answer

Non-spontaneous reaction

Question 64

64. When electricity is passed through molten Al₂O₃ + Na₃AIF₆ and 13.5 gms of Al are deposited, the number of faraday must be

Answer 129

Mole fraction of the solution

Answer 130

Molality of the solution

Answer 131

Molarity of the solution

Answer 132

Molarity of the solvent

Answer 133

From anode to cathode in an outer circuit

Answer 134

From cathode to anode inside the cell

Answer 135

From cathode to anode in outer circuit

Answer 136

From anode to cathode inside the cell

Answer 137

All electrochemical reactions involve the transfer of electrons

Answer 138

Reduction occurs at cathode

Answer 139

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

Answer 140

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

Answer 141

Gives ions only when electricity is passed

Answer 142

Forms complex ions in solution

Answer 143

Possesses ions even in solid state

Answer 144

Gives ions only when dissolved in water

Answer 145

Na⁺ + e– → Na

Answer 146

Br₂ + 2e – → 2Br –

Answer 147

2Br– → Br₂ + 2e –

Answer 148

Na → Na⁺ + e–

Answer 149

Naphthalene

Answer 150

1.15 cm¯³

Answer 151

1.25 cm¯³

Answer 152

2.15 cm¯³

Answer 153

1.81 cm¯³

Answer 154

Loses electrons

Answer 155

Gains electrons

Answer 156

pH is changed

Answer 157

Acts as a catalyst

Answer 158

Li is smaller in size as compared to Cu

Answer 159

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

Answer 160

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

Answer 161

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

Answer 162

None of these

Answer 163

Iron rusts

Answer 164

Gold has higher reduction potential then iron

Answer 165

Gold is denser

Answer 166

Gold has lower reduction potential then iron

Answer 167

S² m² mol

Answer 168

S² m² mol¯²

Answer 169

S m mol¯¹

Answer 170

S m² mol¯¹

Answer 171

Degree of solubilization of solute

Answer 172

The degree of decomposition of solution

Answer 173

The extent of dissociation of solute

Answer 174

The extent of dissolution of solute

Answer 175

Depends on density of electrolyte itself.

Answer 176

Decreases on dilution

Answer 177

Increases on dilution slightly

Answer 178

Does not change on dilution

Answer 179

Spontaneous acid–base reactions

Answer 180

Spontaneous redox reactions

Answer 181

Non-spontaneous redox reactions

Answer 182

None of these

Answer 183

Union between two light metals and a heavy metal

Answer 184

Altered reaction in presence of H₂O

Answer 185

Electrochemical phenomenon

Answer 186

Interaction

Answer 187

Elevation in boiling point

Answer 188

Flow of solvent from a concentrated to a dilute solution

Answer 189

Ionic concentration

Answer 190

Diffusion rate of the solute

Answer 191

None of these

Answer 192

Greater positive value of standard reduction potential

Answer 193

Lesser positive value of standard reduction potential

Answer 194

Greater negative value of standard reduction potential

Answer 195

Osmotic pressure

Answer 196

Surface tension

Answer 197

Refractive index

Answer 198

Redox potential

Answer 199

Oxidation potential

Answer 200

e.m.f of cell

Answer 201

Reduction potential

Answer 202

Oxidation-reduction

Answer 203

Depends on the nature of the coupled electrode

Answer 204

Not particular

Answer 205

The enthalpy of mixing is zero

Answer 206

The entropy of mixing is zero

Answer 207

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

Answer 208

The free energy of mixing is zero

Answer 209

1.06 x 10³

Answer 210

1.06 x 10²

Answer 211

1.06 x 10⁴

Answer 212

Hydrolyzed

Answer 213

Precipitated

Answer 214

12157.48 sec

Answer 215

None of these

Answer 216

None of these

Answer 217

Both Na⁺ and CI¯

Answer 218

Any possibility

Answer 219

B.P of water increase

Answer 220

B.P of water remain constant

Answer 221

B.P of water decrease

Answer 222

58.5g NaCl/100ml

Answer 223

20g NaCl/100ml

Answer 224

5.58g NaCl/100m

Answer 225

10.0g NaCl/100ml

Answer 226

0.1 N NaCl

Answer 227

Reduction potentials are negative

Answer 228

Very high positive value of reduction potential

Answer 229

Very high negative values reduction potential

Answer 230

Very low ionization potential values

Answer 231

Thomas Gradam

Answer 232

Slightly more than 1 atom

Answer 233

760 mm of Hg

Answer 234

Less than that of water

Answer 235

More than that of H₂O

Answer 236

Equal to that of ethanol

Answer 237

Equal to that of water

Answer 238

– 1.17 V

Answer 239

– 0.35 V

Answer 240

[Pt(NH₃)₄Cl₂]Cl₂

Answer 241

[Pt(NH₃)₄Cl]Cl₃

Answer 242

[Pt(NH₃)₄Cl₄]

Answer 243

[Pt(NH₃)₄Cl₃]Cl

Answer 244

Proton transfer

Answer 245

Electron transfer

Answer 246

A reaction in a solution

Answer 247

Ion combination reaction

Answer 248

It is readily available

Answer 249

It is solvent for organic substances

Answer 250

It is volatile

Answer 251

It has a very high cryoscopic constant

Answer 252

22400 cm³

Answer 253

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

Answer 254

Boiling point of pure benzene increases by the addition of toluene

Answer 255

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 256

Boiling point of pure water decreases by the addition of ethanol

Answer 257

Cathodic protection

Answer 258

Galvanization

Answer 259

Photo electrolysis

Answer 260

Electrolysis

Answer 261

Increases gradually

Answer 262

Drops to zero

Answer 263

Does not change

Answer 264

Increases rapidly

Answer 265

Dilute solution which behave as nearly ideal solution

Answer 266

Both a and b

Answer 267

Neither a nor b

Answer 268

Concentration solutions behave as nearly non – ideal solutions

Answer 269

Is oxidized

Answer 270

Loses electrons

Answer 271

Gains electrons

Answer 272

Is hydrolysed

Answer 273

Na, Pt and graphite

Answer 274

Na and S only

Answer 275

Pt and graphite only

Answer 276

Slightly less than the total volume of the components

Answer 277

Equal to the total volume of the components

Answer 278

None of these

Answer 279

Slightly more than the total volume of the components

Answer 280

Ca(NO₃)₂

Answer 281

Weak acid and its salt of weak base

Answer 282

Strong acid and its salt of weak base

Answer 283

Weak acid and its salt of strong base

Answer 284

A strong acid and its salt of a strong base

Answer 285

None of these

Answer 286

H+ and OH-

Answer 287

Salt Bridge

Answer 288

Electric circuit

Answer 289

No connection exists

Answer 290

Electrolytic cell

Answer 291

Daniel cell

Answer 292

Rechargeable

Answer 293

Non rechargeable

Answer 294

96500 g of CU

Answer 295

31.75 g of Cu

Answer 296

63.5 g of Cu

Answer 297

100 g of Cu

Answer 298

Unsaturated

Answer 299

Supersaturated

Answer 300

Neither oxidation and reduction

Answer 301

Both oxidation and reduction

Answer 302

Both of these

Answer 303

None of these

Answer 304

Putting it in saline water

Answer 305

Making iron cathode

Answer 306

Arrhenius law

Answer 307

Raoult’s law

Answer 308

Ostwald’s law

Answer 309

Henry’s law

Answer 310

Sufficient date not given

Answer 311

Dilution increases

Answer 312

Dilution decreases

Answer 313

Pressure increases

Answer 314

Heat energy

Answer 315

Magnetic energy

Answer 316

Electrical energy

Answer 317

Sound energy

Answer 318

Distillation

Answer 319

None of these

Answer 320

Fractional distillation

Answer 321

Vacuum distillation

Answer 322

Ohm cm¯¹

Answer 323

Ohm¯¹ cm¯¹

Answer 324

Ohm¯¹ cm

Answer 325

Ohm cm¯²

Answer 326

Microgram percent

Answer 327

Milligram percent

Answer 328

Gram per million

Answer 329

Parts per million

Answer 330

Temperature

Answer 331

Nature of the gas

Answer 332

All of these

Answer 333

Pressure of the gas

Answer 334

Electroplating

Answer 335

Electric change

Answer 336

Ionization potential

Answer 337

Standard electrode potential

Answer 338

1.25g/Cm³

Answer 339

120 g Cm³

Answer 340

1.2 g/Cm³

Answer 341

1.15 g/Cm³

Answer 342

Hg₂Cl₂

Answer 343

By replacing external circuit with external source of electricity

Answer 344

By heating it

Answer 345

By addition of fresh solution

Answer 346

By removal of solution

Answer 347

Electrical energy

Answer 348

None of these

Answer 349

Chemical energy

Answer 350

Heat energy

Answer 351

None of these

Answer 352

Electrolysis

Answer 353

Electroplating

Answer 354

Conduction

Answer 355

Atoms of Na and Cl.

Answer 356

Free electrons

Answer 357

Free molecules

Answer 358

Increase in oxidation number of the elements in reactants

Answer 359

Oxidation number neither increases nor decreases

Answer 360

Increase in oxidation number of element

Answer 361

Decrease in oxidation number of element

Answer 362

800 mm of Hg

Answer 363

760 mm of Hg

Answer 364

750 mm of Hg

Answer 365

780 mm of Hg

Answer 366

None of these

Answer 367

Both A and B

Answer 368

Electrorefining

Answer 369

Electroplating

Total Questions:	192
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Total Marks:	192
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