Chemistry Electro Chemistry Online Mcqs Test

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Question 1

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

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Generate heat

Answer

Produce high purity water

Answer

Create potential difference between two electrodes

Question 2

2. Temperature for standard electrode potential is

Question 3

3. The unit of specific conductivity is

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯¹

Answer

Ohm cm¯²

Answer

Ohm¯¹ cm

Question 4

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

Answer

Cathodic protection

Answer

Galvanization

Answer

Photo electrolysis

Answer

Electrolysis

Question 5

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

Question 6

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

Question 7

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

Answer

Standard oxidation potential

Answer

Ionization potential

Answer

Standard reduction potential

Answer

Cell voltage

Question 8

8. Specific conductivity of a solution

Answer

Decreases with dilution

Answer

Remains unchanged with dilution

Answer

Increases with dilution

Answer

Depends on mass of electrolyte

Question 9

9. 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 10

10. Oxidation number of carbon in NaHCO₃ is

Question 11

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

Answer

Henry’s law

Answer

Ostwald’s dilution law

Answer

Distribution law

Answer

Raoult’s law

Question 12

12. In a chemical reaction, oxidation process involves

Answer

Oxidation number neither increases nor decreases

Answer

Increase in oxidation number of the elements in reactants

Answer

Increase in oxidation number of element

Answer

Decrease in oxidation number of element

Question 13

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

Answer

Refractive index

Answer

Osmotic pressure

Answer

Surface tension

Question 14

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

Answer

Both Na⁺ and CI¯

Answer

None of these

Question 15

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

Answer

pH is changed

Answer

Gains electrons

Answer

Loses electrons

Answer

Acts as a catalyst

Question 16

16. Mole fraction of pure water is

Answer

None of these

Answer

Exactly equal to one

Answer

Slightly greater than one

Answer

Slightly less than one

Question 17

17. Best way to prevent rusting iron is by

Answer

None of these

Answer

Making iron cathode

Answer

Putting it in saline water

Answer

Both of these

Question 18

18. A redox reaction involves

Answer

Electron transfer

Answer

Ion combination reaction

Answer

A reaction in a solution

Answer

Proton transfer

Question 19

19. Salt bridge transfers

Answer

Solvent particles

Question 20

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

Question 21

21. 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 22

22. 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 23

23. What are the ions present in water?

Answer

H+ and OH-

Question 24

24. 2.5 faradays of electricity is passed through solution of CuSO₄. The number of gram equivalents of copper deposited on the cathode would be

Answer

None of these

Question 25

25. Voltaic cell can be recharged by

Answer

By heating it

Answer

By removal of solution

Answer

By addition of fresh solution

Answer

By replacing external circuit with external source of electricity

Question 26

26. The depression of freezing point is directly proportional to

Answer

Molarity of the solvent

Answer

Molality of the solution

Answer

Mole fraction of the solution

Answer

Molarity of the solution

Question 27

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

Question 28

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

Question 29

29. Electrode potential of Zn is

Answer

Oxidation-reduction

Answer

Depends on the nature of the coupled electrode

Question 30

30. Time required to deposit one millimole of aluminum metal by the passage of 9.65 amperes through molten electrolyte containing aluminum ion is

Question 31

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

Question 32

32. Choose the best reducing agent among the following

Question 33

33. Corrosion is basically a

Answer

Interaction

Answer

Electrochemical phenomenon

Answer

Union between two light metals and a heavy metal

Answer

Altered reaction in presence of H₂O

Question 34

34. 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 35

35. Cathode provides electrons to

Answer

Does not provide any electron

Answer

Neutral atom

Question 36

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

Answer

Slightly less than the total volume of the components

Answer

None of these

Answer

Equal to the total volume of the components

Answer

Slightly more than the total volume of the components

Question 37

37. The Vant Hoff factor (i) accounts for

Answer

The extent of dissolution of solute

Answer

The extent of dissociation of solute

Answer

The degree of decomposition of solution

Answer

Degree of solubilization of solute

Question 38

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

Answer

Electrolytic cell

Answer

Galvanic cell

Question 39

39. In the electrolysis of molten sodium chloride, what is the yellow green gas formed?

Question 40

40. Camphor is often used in molecular mass determination because

Answer

It is readily available

Answer

It has a very high cryoscopic constant

Answer

It is solvent for organic substances

Answer

It is volatile

Question 41

41. Oxidation in a chemical reaction involves

Answer

Both are possible

Answer

Increase in oxidation number

Answer

Decrease in oxidation number

Answer

Increase in oxidation number of all the elements on reactant side

Question 42

42. Vant Hoff’s factor of Ca(NO₃)₂ is

Question 43

43. A 0.001 molal solution of [Pt(NH₃)₄Cl₄] in water had a freezing point depression of 0.0054°C. If Kf for water is 1.80, the correct formulation for the above molecule is

Answer

[Pt(NH₃)₄Cl₂]Cl₂

Answer

[Pt(NH₃)₄Cl₃]Cl

Answer

[Pt(NH₃)₄Cl₄]

Answer

[Pt(NH₃)₄Cl]Cl₃

Question 44

44. Half cells are interconnected through

Answer

Electric circuit

Answer

Salt Bridge

Answer

No connection exists

Question 45

45. The strength of solution an element whose electrode potential is to be measured

Question 46

46. When common salt is dissolved in water

Answer

B.P of water increase

Answer

B.P of water decrease

Answer

Any possibility

Answer

B.P of water remain constant

Question 47

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

Answer

– 0.35 V

Answer

– 1.17 V

Question 48

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

Answer

One gm. atomic weight

Answer

Electrochemical equivalent

Answer

One gm. Equivalent weight

Answer

None of these

Question 49

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

Answer

Chloroform

Answer

Molten NaCl

Answer

Dilute solution of glucose

Answer

Pure distilled water

Question 50

50. The amount of electricity that can deposit 108 g of silver from silver nitrate solution is

Question 51

51. Sea water has 5.65 x 10¯³ g of dissolved oxygen calculate the conclusion of oxygen in sea water in ppx

Question 52

52. 8 g of NaOh is dissolved in 500 cm³ of solution, its molarity is:

Question 53

53. The best reducing agent is

Question 54

54. The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is

Question 55

55. 96500 C of electricity liberates from CuSO₄ solution

Answer

100 g of Cu

Answer

31.75 g of Cu

Answer

63.5 g of Cu

Answer

96500 g of CU

Question 56

56. 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

Conduction

Answer

Electroplating

Question 57

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

Answer

Electrorefining

Answer

Both A and B

Answer

Electroplating

Answer

None of these

Question 58

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

Answer

Ionic concentration

Answer

Diffusion rate of the solute

Answer

Flow of solvent from a concentrated to a dilute solution

Answer

Elevation in boiling point

Question 59

59. The conductivity of strong electrolyte

Answer

Increases on dilution slightly

Answer

Depends on density of electrolyte itself.

Answer

Does not change on dilution

Answer

Decreases on dilution

Question 60

60. In alkaline battery anode is made up of

Question 61

61. 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 62

62. The electrode with more negative value of reduction potential acts as

Answer

None of these

Question 63

63. A 20% solution of NaCl by weight means that

Answer

20g NaCl/100ml

Answer

10.0g NaCl/100ml

Answer

5.58g NaCl/100m

Answer

58.5g NaCl/100ml

Question 64

64. 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

Answer 140

Dilution increases

Answer 141

Pressure increases

Answer 142

Dilution decreases

Answer 143

0.1 M Glucose

Answer 144

0.1 M BaCl₂

Answer 145

0.1 M NaCl

Answer 146

0.1 M Sucrose

Answer 147

Chemical energy is converted into heat

Answer 148

Electrical energy is converted into chemical energy

Answer 149

Electrical energy is converted into heat

Answer 150

Chemical energy is converted into electricity

Answer 151

Not particular

Answer 152

Pressure of the gas

Answer 153

Nature of the gas

Answer 154

All of these

Answer 155

Temperature

Answer 156

Equal to that of water

Answer 157

Equal to that of ethanol

Answer 158

Less than that of water

Answer 159

More than that of H₂O

Answer 160

Ca(NO₃)₂

Answer 161

Anode to cathode through the external circuit

Answer 162

Anode to cathode through the solution

Answer 163

Cathode to anode through the solution

Answer 164

Cathode to anode through the external circuit

Answer 165

Gives ions only when dissolved in water

Answer 166

Forms complex ions in solution

Answer 167

Gives ions only when electricity is passed

Answer 168

Possesses ions even in solid state

Answer 169

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

Answer 170

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

Answer 171

Hg is more inert than Pt

Answer 172

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

Answer 173

Hg₂Cl₂

Answer 174

Na, Pt and graphite

Answer 175

Pt and graphite only

Answer 176

Na and S only

Answer 177

From anode to cathode in an outer circuit

Answer 178

From anode to cathode inside the cell

Answer 179

From cathode to anode in outer circuit

Answer 180

From cathode to anode inside the cell

Answer 181

None of these

Answer 182

Br₂ + 2e – → 2Br –

Answer 183

Na → Na⁺ + e–

Answer 184

2Br– → Br₂ + 2e –

Answer 185

Na⁺ + e– → Na

Answer 186

Neutralization

Answer 187

Spontaneous reaction

Answer 188

Non-spontaneous reaction

Answer 189

H₄P₃O₇

Answer 190

Sufficient date not given

Answer 191

A galvanic cell

Answer 192

A voltaic cell

Answer 193

An electrolytic cell

Answer 194

A chemical cell

Answer 195

Metals are decomposed by current

Answer 196

In metals the ions are free to more

Answer 197

Metals have high resistance

Answer 198

They are mobile electrons in the metallic structure

Answer 199

Electrolytic cell

Answer 200

Non rechargeable

Answer 201

Rechargeable

Answer 202

Daniel cell

Answer 203

750 mm of Hg

Answer 204

800 mm of Hg

Answer 205

760 mm of Hg

Answer 206

780 mm of Hg

Answer 207

Decreases slowly

Answer 208

Drops to zero

Answer 209

Does not change

Answer 210

Decrease rapidly

Answer 211

Boiling point of pure water decreases by the addition of ethanol

Answer 212

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

Answer 213

Boiling point of pure benzene increases by the addition of toluene

Answer 214

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 215

22400 cm³

Answer 216

Gold has lower reduction potential then iron

Answer 217

Gold is denser

Answer 218

Iron rusts

Answer 219

Gold has higher reduction potential then iron

Answer 220

Nitric acid

Answer 221

Boric acid

Answer 222

Phosphorus acid

Answer 223

Sulphuric acid

Answer 224

12157.48 sec

Answer 225

0.142 cm¯¹

Answer 226

0.66 cm¯¹

Answer 227

0.918 cm¯¹

Answer 228

1.12 cm¯¹

Answer 229

It has not potential

Answer 230

Gains electrons

Answer 231

Is oxidized

Answer 232

Is hydrolysed

Answer 233

Loses electrons

Answer 234

The entropy of mixing is zero

Answer 235

The enthalpy of mixing is zero

Answer 236

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

Answer 237

The free energy of mixing is zero

Answer 238

Thomas Gradam

Answer 239

Neutralization

Answer 240

Hg₂Cl₂

Answer 241

Non-spontaneous redox reactions

Answer 242

Spontaneous redox reactions

Answer 243

None of these

Answer 244

Spontaneous acid–base reactions

Answer 245

Heat energy

Answer 246

Electrical energy

Answer 247

Magnetic energy

Answer 248

Sound energy

Answer 249

Electroplating

Answer 250

Rust removal

Answer 251

Making leather

Answer 252

Manufacture of bleach

Answer 253

None of these

Answer 254

Electrical energy

Answer 255

Chemical energy

Answer 256

Heat energy

Answer 257

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

Answer 258

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

Answer 259

Li is smaller in size as compared to Cu

Answer 260

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

Answer 261

Electroplating

Answer 262

Ionization potential

Answer 263

Standard electrode potential

Answer 264

Electric change

Answer 265

Has low boiling point

Answer 266

Is readily decomposed

Answer 267

Is neutral

Answer 268

Is almost unionized

Answer 269

CH₃ CooNH₄

Answer 270

Na₂SO₄

Answer 271

1.81 cm¯³

Answer 272

2.15 cm¯³

Answer 273

1.15 cm¯³

Answer 274

1.25 cm¯³

Answer 275

Concentration solutions behave as nearly non – ideal solutions

Answer 276

Neither a nor b

Answer 277

Both a and b

Answer 278

Dilute solution which behave as nearly ideal solution

Answer 279

Greater positive value of standard reduction potential

Answer 280

Lesser positive value of standard reduction potential

Answer 281

Greater negative value of standard reduction potential

Answer 282

None of these

Answer 283

Hydrolyzed

Answer 284

Precipitated

Answer 285

302 S cm² mol¯¹

Answer 286

278 S cm² mol¯¹

Answer 287

176 S cm² mol¯¹

Answer 288

128 S cm² mol¯¹

Answer 289

Oxidation potential

Answer 290

e.m.f of cell

Answer 291

Reduction potential

Answer 292

Redox potential

Answer 293

Both A and B

Answer 294

At cathode

Answer 295

None of these

Answer 296

Electrolytic cell

Answer 297

Galvanic cell

Answer 298

Daniel cell

Answer 299

Electrons flow from cathode to anode through the external battery

Answer 300

Electrons flow cathode to anode within the electrolytic solution

Answer 301

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

Answer 302

None of these

Answer 303

Ionization

Answer 304

Hydrolysis

Answer 305

None of these

Answer 306

O₂, SO₂

Answer 307

A strong acid and its salt of a strong base

Answer 308

Weak acid and its salt of weak base

Answer 309

Strong acid and its salt of weak base

Answer 310

Weak acid and its salt of strong base

Answer 311

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

Answer 312

All electrochemical reactions involve the transfer of electrons

Answer 313

Reduction occurs at cathode

Answer 314

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

Answer 315

0.1 N NaCl

Answer 316

Supersaturated

Answer 317

Unsaturated

Answer 318

Naphthalene

Answer 319

Drops to zero

Answer 320

Does not change

Answer 321

Increases gradually

Answer 322

Increases rapidly

Answer 323

1.2 g/Cm³

Answer 324

1.15 g/Cm³

Answer 325

120 g Cm³

Answer 326

1.25g/Cm³

Answer 327

None of these

Answer 328

Both oxidation and reduction

Answer 329

Neither oxidation and reduction

Answer 330

1.06 x 10²

Answer 331

1.06 x 10³

Answer 332

1.06 x 10⁴

Answer 333

All of these

Answer 334

Hypertonic

Answer 335

∆ G = -ve

Answer 336

∆ G = -ve, ∆ E = 0

Answer 337

∆ G = +ve, ∆ E = 0

Answer 338

∆ G = 0, ∆E = 0

Answer 339

Microgram percent

Answer 340

Gram per million

Answer 341

Milligram percent

Answer 342

Parts per million

Answer 343

Atoms of Na and Cl.

Answer 344

Free molecules

Answer 345

Free electrons

Answer 346

760 mm of Hg

Answer 347

Slightly more than 1 atom

Answer 348

Ostwald’s law

Answer 349

Arrhenius law

Answer 350

Raoult’s law

Answer 351

Henry’s law

Answer 352

Boiling point

Answer 353

Melting point

Answer 354

Sublimation point

Answer 355

Inversion point

Answer 356

1 – 2 α

Answer 357

Vacuum distillation

Answer 358

Distillation

Answer 359

None of these

Answer 360

Fractional distillation

Answer 361

Sum of reduction and oxidation potentials

Answer 362

S² m² mol¯²

Answer 363

S² m² mol

Answer 364

S m² mol¯¹

Answer 365

S m mol¯¹

Answer 366

Very low ionization potential values

Answer 367

Very high positive value of reduction potential

Answer 368

Reduction potentials are negative

Answer 369

Very high negative values reduction potential

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