Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. Pick out the wrong statement. In electrochemical cell

Answer

Cathode is regarded as negative electrode

Answer

Electrons are released at anode

Answer

Chemical energy is converted into electrical energy

Answer

Salt bridge maintains the electrical neutrality of the solution

Question 2

2. When common salt is dissolved in water

Answer

Any possibility

Answer

B.P of water decrease

Answer

B.P of water remain constant

Answer

B.P of water increase

Question 3

3. Electrolysis is the process in which a chemical reaction takes place at the expense of

Answer

None of these

Answer

Electrical energy

Answer

Heat energy

Answer

Chemical energy

Question 4

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

Question 5

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

Question 6

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

Question 7

7. The degree of dissociation of weak electrolyte increases as

Answer

Dilution increases

Answer

Dilution decreases

Answer

Pressure increases

Question 8

8. 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

4.0 x 10¹²

Answer

1.0 x 10²

Answer

1.0 x 10¹⁰

Answer

2.0 x 10¹¹

Question 9

9. A redox reaction involves

Answer

Ion combination reaction

Answer

A reaction in a solution

Answer

Proton transfer

Answer

Electron transfer

Question 10

10. Which of the following statements is FALSE?

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

All electrochemical reactions involve the transfer of electrons

Answer

Reduction occurs at cathode

Question 11

11. It azeotropic mixture showing positive deviation from Rault’s law, the volume of the mixture is

Answer

Slightly more than the total volume of the components

Answer

Equal to the total volume of the components

Answer

Slightly less than the total volume of the components

Answer

None of these

Question 12

12. Best way to prevent rusting iron is by

Answer

Both of these

Answer

None of these

Answer

Making iron cathode

Answer

Putting it in saline water

Question 13

13. An oxidizing agent in a chemical reaction in the substance which

Answer

pH is changed

Answer

Gains electrons

Answer

Acts as a catalyst

Answer

Loses electrons

Question 14

14. Stronger the oxidizing agent, greater is the

Answer

Redox potential

Answer

Reduction potential

Answer

e.m.f of cell

Answer

Oxidation potential

Question 15

15. 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

Reduction potentials are negative

Answer

Very high negative values reduction potential

Answer

Very high positive value of reduction potential

Question 16

16. Azeotropic mixture of HCl and water has

Question 17

17. 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 18

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

Answer

Ionization potential

Answer

Electroplating

Answer

Standard electrode potential

Answer

Electric change

Question 19

19. Which one of the following is a colligative property?

Answer

Osmotic pressure

Answer

Refractive index

Answer

Surface tension

Question 20

20. The half-reaction that occurs at the anode during the electrolysis of molten sodium bromide is:

Answer

2Br– → Br₂ + 2e –

Answer

Na → Na⁺ + e–

Answer

Br₂ + 2e – → 2Br –

Answer

Na⁺ + e– → Na

Question 21

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

Question 22

22. Chemical used in salt bridge is

Question 23

23. Secondary cell is

Answer

Daniel cell

Answer

Rechargeable

Answer

Non rechargeable

Answer

Electrolytic cell

Question 24

24. In alkaline battery anode is made up of

Question 25

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

Answer

Gold has higher reduction potential then iron

Answer

Gold is denser

Answer

Gold has lower reduction potential then iron

Answer

Iron rusts

Question 26

26. Voltaic cell can be recharged by

Answer

By removal of solution

Answer

By addition of fresh solution

Answer

By heating it

Answer

By replacing external circuit with external source of electricity

Question 27

27. Electrode potential of Zn is

Answer

Depends on the nature of the coupled electrode

Answer

Oxidation-reduction

Question 28

28. If the ionic product of a solution is less than the solubility product, the solution is

Answer

Supersaturated

Answer

Unsaturated

Question 29

29. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 30

30. Salt bridge transfers

Question 31

31. 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 32

32. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 33

33. Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

Answer

Na and S only

Answer

Na, Pt and graphite

Answer

Pt and graphite only

Question 34

34. Half cells are interconnected through

Answer

Electric circuit

Answer

No connection exists

Answer

Salt Bridge

Question 35

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

Answer

0.1 M Sucrose

Answer

0.1 M NaCl

Answer

0.1 M Glucose

Answer

0.1 M BaCl₂

Question 36

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

Question 37

37. Strong reducing agents have

Answer

Lesser positive value of standard reduction potential

Answer

None of these

Answer

Greater positive value of standard reduction potential

Answer

Greater negative value of standard reduction potential

Question 38

38. Which substances are mixed to form a buffer solution?

Answer

Weak acid and its salt of strong base

Answer

Strong acid and its salt of weak base

Answer

A strong acid and its salt of a strong base

Answer

Weak acid and its salt of weak base

Question 39

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

Answer

None of these

Answer

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

Answer

Electrons flow from cathode to anode through the external battery

Answer

Electrons flow cathode to anode within the electrolytic solution

Question 40

40. In a chemical reaction, oxidation process involves

Answer

Decrease in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Answer

Increase in oxidation number of the elements in reactants

Answer

Increase in oxidation number of element

Question 41

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

Question 42

42. Which of the following is the strongest oxidizing agent?

Question 43

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

Question 44

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

Answer

Distribution law

Answer

Ostwald’s dilution law

Answer

Raoult’s law

Answer

Henry’s law

Question 45

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

Answer

0.1 N NaCl

Question 46

46. Separation of azeotropic mixture into pure components is carried out by

Answer

Vacuum distillation

Answer

Distillation

Answer

Fractional distillation

Answer

None of these

Question 47

47. The EMF of the cell rection Fe²⁺ + zn = Zn²⁺ + feis

Answer

– 0.35 V

Answer

– 1.17 V

Question 48

48. The number of moles of a solute in 500 cm³, 3M solution is

Question 49

49. The vapour pressure of two liquids ‘P’ and ‘Q’ are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

Question 50

50. At room temperature, the mole fraction of a solution in 0.25 and the vapour pressure of the solvent is 0.80 atm. Then the lowering of vapour pressure is

Question 51

51. Under the process of rusting of iron, 4Fe + 3O₂ → 2Fe₂O₃, iron is

Answer

Precipitated

Answer

Hydrolyzed

Question 52

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

Answer

Manufacture of bleach

Answer

Electroplating

Answer

Rust removal

Answer

Making leather

Question 53

53. If the standard electrode potential of CU²⁺/Cu electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of Cu²⁺? (T = 298 K)

Question 54

54. 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 55

55. The process of electrical coating of one metal on another to protect, decorate or to have a greater resistance to corrosion is called

Answer

Electrolysis

Answer

Electroplating

Answer

Conduction

Question 56

56. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 57

57. Oxidation number of carbon in NaHCO₃ is

Question 58

58. When electricity is passed through molten electrolyte consisting of alumina and cryolite, 13.5 g of Al are deposited. The number of faradays of electricity passed must be

Question 59

59. Maximum freezing point falls in

Answer

Naphthalene

Question 60

60. Molarity of water is

Question 61

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

Answer

Drops to zero

Answer

Does not change

Answer

Increases gradually

Answer

Increases rapidly

Question 62

62. Specific conductivity of a solution

Answer

Depends on mass of electrolyte

Answer

Remains unchanged with dilution

Answer

Decreases with dilution

Answer

Increases with dilution

Question 63

63. Cathodic reaction in the electrolysis of dil. H₂SO₄ is always

Question 64

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

Answer

Both Na⁺ and CI¯

Answer

None of these

Answer 135

Electrolytic cell

Answer 136

Galvanic cell

Answer 137

It has not potential

Answer 138

Li is smaller in size as compared to Cu

Answer 139

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

Answer 140

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

Answer 141

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

Answer 142

S m mol¯¹

Answer 143

S² m² mol¯²

Answer 144

S² m² mol

Answer 145

S m² mol¯¹

Answer 146

Molten NaCl

Answer 147

Pure distilled water

Answer 148

Chloroform

Answer 149

Dilute solution of glucose

Answer 150

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

Answer 151

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

Answer 152

Hg is more inert than Pt

Answer 153

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

Answer 154

Inversion point

Answer 155

Sublimation point

Answer 156

Boiling point

Answer 157

Melting point

Answer 158

Is almost unionized

Answer 159

Has low boiling point

Answer 160

Is readily decomposed

Answer 161

Is neutral

Answer 162

None of these

Answer 163

Na₂SO₄

Answer 164

CH₃ CooNH₄

Answer 165

Elevation in boiling point

Answer 166

Ionic concentration

Answer 167

Flow of solvent from a concentrated to a dilute solution

Answer 168

Diffusion rate of the solute

Answer 169

63.5 g of Cu

Answer 170

31.75 g of Cu

Answer 171

96500 g of CU

Answer 172

100 g of Cu

Answer 173

22400 cm³

Answer 174

Molarity of the solvent

Answer 175

Molality of the solution

Answer 176

Molarity of the solution

Answer 177

Mole fraction of the solution

Answer 178

1 – 2 α

Answer 179

It is solvent for organic substances

Answer 180

It is volatile

Answer 181

It is readily available

Answer 182

It has a very high cryoscopic constant

Answer 183

1.12 cm¯¹

Answer 184

0.66 cm¯¹

Answer 185

0.142 cm¯¹

Answer 186

0.918 cm¯¹

Answer 187

Slightly more than 1 atom

Answer 188

760 mm of Hg

Answer 189

Electrochemical equivalent

Answer 190

None of these

Answer 191

One gm. Equivalent weight

Answer 192

One gm. atomic weight

Answer 193

1.25 cm¯³

Answer 194

2.15 cm¯³

Answer 195

1.15 cm¯³

Answer 196

1.81 cm¯³

Answer 197

1.06 x 10²

Answer 198

1.06 x 10⁴

Answer 199

1.06 x 10³

Answer 200

Boric acid

Answer 201

Sulphuric acid

Answer 202

Phosphorus acid

Answer 203

Nitric acid

Answer 204

Both oxidation and reduction

Answer 205

Neither oxidation and reduction

Answer 206

12157.48 sec

Answer 207

Spontaneous reaction

Answer 208

Neutralization

Answer 209

Non-spontaneous reaction

Answer 210

Ohm¯¹ cm¯¹

Answer 211

Ohm cm¯¹

Answer 212

Ohm¯¹ cm

Answer 213

Ohm cm¯²

Answer 214

Microgram percent

Answer 215

Gram per million

Answer 216

Milligram percent

Answer 217

Parts per million

Answer 218

Pressure of the gas

Answer 219

Nature of the gas

Answer 220

Temperature

Answer 221

All of these

Answer 222

An electrolytic cell

Answer 223

A voltaic cell

Answer 224

A galvanic cell

Answer 225

A chemical cell

Answer 226

Increase in oxidation number of all the elements on reactant side

Answer 227

Decrease in oxidation number

Answer 228

Increase in oxidation number

Answer 229

Both are possible

Answer 230

Decreases slowly

Answer 231

Drops to zero

Answer 232

Decrease rapidly

Answer 233

Does not change

Answer 234

Hydrolysis

Answer 235

Ionization

Answer 236

Concentration solutions behave as nearly non – ideal solutions

Answer 237

Neither a nor b

Answer 238

Both a and b

Answer 239

Dilute solution which behave as nearly ideal solution

Answer 240

Cell voltage

Answer 241

Ionization potential

Answer 242

Standard oxidation potential

Answer 243

Standard reduction potential

Answer 244

From anode to cathode in an outer circuit

Answer 245

From cathode to anode inside the cell

Answer 246

From cathode to anode in outer circuit

Answer 247

From anode to cathode inside the cell

Answer 248

Atoms of Na and Cl.

Answer 249

Free electrons

Answer 250

Free molecules

Answer 251

Decreases on dilution

Answer 252

Does not change on dilution

Answer 253

Increases on dilution slightly

Answer 254

Depends on density of electrolyte itself.

Answer 255

Non-spontaneous redox reactions

Answer 256

Spontaneous redox reactions

Answer 257

Spontaneous acid–base reactions

Answer 258

None of these

Answer 259

750 mm of Hg

Answer 260

800 mm of Hg

Answer 261

760 mm of Hg

Answer 262

780 mm of Hg

Answer 263

Sufficient date not given

Answer 264

Thomas Gradam

Answer 265

Neutralization

Answer 266

At cathode

Answer 267

Both A and B

Answer 268

None of these

Answer 269

H₄P₃O₇

Answer 270

None of these

Answer 271

Exactly equal to one

Answer 272

Slightly less than one

Answer 273

Slightly greater than one

Answer 274

176 S cm² mol¯¹

Answer 275

128 S cm² mol¯¹

Answer 276

302 S cm² mol¯¹

Answer 277

278 S cm² mol¯¹

Answer 278

Daniel cell

Answer 279

Electrolytic cell

Answer 280

Galvanic cell

Answer 281

Less than that of water

Answer 282

More than that of H₂O

Answer 283

Equal to that of ethanol

Answer 284

Equal to that of water

Answer 285

Does not provide any electron

Answer 286

Neutral atom

Answer 287

The free energy of mixing is zero

Answer 288

The enthalpy of mixing is zero

Answer 289

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

Answer 290

The entropy of mixing is zero

Answer 291

The extent of dissolution of solute

Answer 292

Degree of solubilization of solute

Answer 293

The degree of decomposition of solution

Answer 294

The extent of dissociation of solute

Answer 295

None of these

Answer 296

Hg₂Cl₂

Answer 297

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

Answer 298

Boiling point of pure water decreases by the addition of ethanol

Answer 299

Boiling point of pure benzene increases by the addition of toluene

Answer 300

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 301

Ca(NO₃)₂

Answer 302

Is hydrolysed

Answer 303

Gains electrons

Answer 304

Is oxidized

Answer 305

Loses electrons

Answer 306

None of these

Answer 307

H+ and OH-

Answer 308

Chemical energy is converted into electricity

Answer 309

Electrical energy is converted into chemical energy

Answer 310

Electrical energy is converted into heat

Answer 311

Chemical energy is converted into heat

Answer 312

∆ G = -ve

Answer 313

∆ G = 0, ∆E = 0

Answer 314

∆ G = +ve, ∆ E = 0

Answer 315

∆ G = -ve, ∆ E = 0

Answer 316

Photo electrolysis

Answer 317

Galvanization

Answer 318

Cathodic protection

Answer 319

Electrolysis

Answer 320

Magnetic energy

Answer 321

Electrical energy

Answer 322

Sound energy

Answer 323

Heat energy

Answer 324

[Pt(NH₃)₄Cl₃]Cl

Answer 325

[Pt(NH₃)₄Cl₄]

Answer 326

[Pt(NH₃)₄Cl]Cl₃

Answer 327

[Pt(NH₃)₄Cl₂]Cl₂

Answer 328

None of these

Answer 329

O₂, SO₂

Answer 330

Solvent particles

Answer 331

1.15 g/Cm³

Answer 332

1.25g/Cm³

Answer 333

120 g Cm³

Answer 334

1.2 g/Cm³

Answer 335

58.5g NaCl/100ml

Answer 336

5.58g NaCl/100m

Answer 337

20g NaCl/100ml

Answer 338

10.0g NaCl/100ml

Answer 339

Hg₂Cl₂

Answer 340

Ostwald’s law

Answer 341

Henry’s law

Answer 342

Arrhenius law

Answer 343

Raoult’s law

Answer 344

Metals are decomposed by current

Answer 345

Metals have high resistance

Answer 346

In metals the ions are free to more

Answer 347

They are mobile electrons in the metallic structure

Answer 348

Remove adsorbed oxygen from electrode surfaces

Answer 349

Create potential difference between two electrodes

Answer 350

Generate heat

Answer 351

Produce high purity water

Answer 352

All of these

Answer 353

Forms complex ions in solution

Answer 354

Gives ions only when dissolved in water

Answer 355

Gives ions only when electricity is passed

Answer 356

Possesses ions even in solid state

Answer 357

Both A and B

Answer 358

Electroplating

Answer 359

Electrorefining

Answer 360

None of these

Answer 361

Anode to cathode through the external circuit

Answer 362

Cathode to anode through the solution

Answer 363

Anode to cathode through the solution

Answer 364

Cathode to anode through the external circuit

Answer 365

Interaction

Answer 366

Altered reaction in presence of H₂O

Answer 367

Electrochemical phenomenon

Answer 368

Union between two light metals and a heavy metal

Answer 369

Not particular

Total Questions:	192
Time Allowed:	60 Minutes
Total Marks:	192
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