Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

Question 2

2. Which has maximum oxidation number

Question 3

3. 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 4

4. An electric current is passed through silver nitrate solution using silver electrodes. 10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is

Question 5

5. During a redox reaction, an oxidizing agent

Answer

Loses electrons

Answer

Gains electrons

Answer

Is hydrolysed

Answer

Is oxidized

Question 6

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

Question 7

7. If liquids A and B form an ideal solution

Answer

The entropy of mixing is zero

Answer

The free energy of mixing is zero

Answer

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

Answer

The enthalpy of mixing is zero

Question 8

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

Answer

A strong acid and its salt of a strong base

Answer

Strong acid and its salt of weak base

Answer

Weak acid and its salt of weak base

Answer

Weak acid and its salt of strong base

Question 9

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

Question 10

10. In a chemical reaction, oxidation process involves

Answer

Oxidation number neither increases nor decreases

Answer

Increase in oxidation number of element

Answer

Increase in oxidation number of the elements in reactants

Answer

Decrease in oxidation number of element

Question 11

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

Answer

O₂, SO₂

Answer

None of these

Question 12

12. 96500 C of electricity liberates from CuSO₄ solution

Answer

100 g of Cu

Answer

31.75 g of Cu

Answer

96500 g of CU

Answer

63.5 g of Cu

Question 13

13. What will be the weight of deposited silver on passing 965 coulombs of electricity in solution of AgNO₃?

Question 14

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

Answer

Equal to that of ethanol

Answer

Equal to that of water

Answer

More than that of H₂O

Answer

Less than that of water

Question 15

15. Metals usually conduct electricity because

Answer

Metals have high resistance

Answer

They are mobile electrons in the metallic structure

Answer

Metals are decomposed by current

Answer

In metals the ions are free to more

Question 16

16. 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 17

17. 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 18

18. Potential of Zn is called

Answer

It has not potential

Question 19

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

Question 20

20. The molality of 2% NaCl. W/W solution is approximately

Question 21

21. What are the ions present in water?

Answer

H+ and OH-

Question 22

22. In a Galvanic cell

Answer

Electrical energy is converted into heat

Answer

Chemical energy is converted into heat

Answer

Electrical energy is converted into chemical energy

Answer

Chemical energy is converted into electricity

Question 23

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

Question 24

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

Question 25

25. 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 26

26. Specific conductivity of a solution

Answer

Increases with dilution

Answer

Depends on mass of electrolyte

Answer

Decreases with dilution

Answer

Remains unchanged with dilution

Question 27

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

Question 28

28. The conductivity of strong electrolyte

Answer

Decreases on dilution

Answer

Increases on dilution slightly

Answer

Does not change on dilution

Answer

Depends on density of electrolyte itself.

Question 29

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

Answer

Nitric acid

Answer

Sulphuric acid

Answer

Phosphorus acid

Answer

Boric acid

Question 30

30. 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

0.918 cm¯¹

Answer

1.12 cm¯¹

Answer

0.66 cm¯¹

Answer

0.142 cm¯¹

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

Answer

Henry’s law

Answer

Ostwald’s law

Answer

Raoult’s law

Answer

Arrhenius law

Question 33

33. The unit of specific conductivity is

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯¹

Answer

Ohm¯¹ cm

Answer

Ohm cm¯²

Question 34

34. Pure water does not conduct electricity because it

Answer

Is readily decomposed

Answer

Is almost unionized

Answer

Is neutral

Answer

Has low boiling point

Question 35

35. Camphor is often used in molecular mass determination because

Answer

It is readily available

Answer

It is solvent for organic substances

Answer

It is volatile

Answer

It has a very high cryoscopic constant

Question 36

36. 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 37

37. Molarity of water is

Question 38

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

Answer

∆ G = 0, ∆E = 0

Answer

∆ G = -ve

Answer

∆ G = -ve, ∆ E = 0

Answer

∆ G = +ve, ∆ E = 0

Question 39

39. Strong reducing agents have

Answer

Greater negative value of standard reduction potential

Answer

Greater positive value of standard reduction potential

Answer

Lesser positive value of standard reduction potential

Answer

None of these

Question 40

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

Answer

Galvanization

Answer

Photo electrolysis

Answer

Cathodic protection

Answer

Electrolysis

Question 41

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

Answer

H₄P₃O₇

Question 42

42. The solubility of a gas in water depends upon

Answer

Nature of the gas

Answer

Pressure of the gas

Answer

All of these

Answer

Temperature

Question 43

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

Question 44

44. Which of the following statements is FALSE?

Answer

Reduction occurs at cathode

Answer

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

Answer

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

Answer

All electrochemical reactions involve the transfer of electrons

Question 45

45. Pick out the wrong statement. In electrochemical cell

Answer

Electrons are released at anode

Answer

Chemical energy is converted into electrical energy

Answer

Cathode is regarded as negative electrode

Answer

Salt bridge maintains the electrical neutrality of the solution

Question 46

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

Answer

None of these

Answer

Both Na⁺ and CI¯

Question 47

47. 1.0 g of pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by

Question 48

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

Answer

Electrons flow from cathode to anode through the external battery

Answer

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

Answer

Electrons flow cathode to anode within the electrolytic solution

Answer

None of these

Question 49

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

Question 50

50. Alkaline battery has a voltage of

Question 51

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

Question 52

52. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 53

53. Electrode potential of Zn is

Answer

Depends on the nature of the coupled electrode

Answer

Oxidation-reduction

Question 54

54. Corrosion reactions are

Answer

Spontaneous acid–base reactions

Answer

Spontaneous redox reactions

Answer

None of these

Answer

Non-spontaneous redox reactions

Question 55

55. 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 10³

Answer

1.06 x 10²

Answer

1.06 x 10⁴

Question 56

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

Question 57

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

Answer

Equal to the total volume of the components

Answer

None of these

Answer

Slightly more than the total volume of the components

Answer

Slightly less than the total volume of the components

Question 58

58. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 59

59. How much of NaOH is required to neutralize 1500 cm³ of 0.1 N HCl?

Question 60

60. 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 61

61. Maximum freezing point falls in

Answer

Naphthalene

Question 62

62. Choose the best reducing agent among the following

Question 63

63. When common salt is dissolved in water

Answer

B.P of water remain constant

Answer

B.P of water increase

Answer

Any possibility

Answer

B.P of water decrease

Question 64

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

Answer

Precipitated

Answer

Hydrolyzed

Answer 131

760 mm of Hg

Answer 132

780 mm of Hg

Answer 133

750 mm of Hg

Answer 134

800 mm of Hg

Answer 135

Unsaturated

Answer 136

Supersaturated

Answer 137

Loses electrons

Answer 138

pH is changed

Answer 139

Acts as a catalyst

Answer 140

Gains electrons

Answer 141

Proton transfer

Answer 142

Electron transfer

Answer 143

A reaction in a solution

Answer 144

Ion combination reaction

Answer 145

Sublimation point

Answer 146

Melting point

Answer 147

Boiling point

Answer 148

Inversion point

Answer 149

Ionization potential

Answer 150

Standard electrode potential

Answer 151

Electroplating

Answer 152

Electric change

Answer 153

Hydrolysis

Answer 154

Ionization

Answer 155

Thomas Gradam

Answer 156

None of these

Answer 157

None of these

Answer 158

One gm. Equivalent weight

Answer 159

Electrochemical equivalent

Answer 160

One gm. atomic weight

Answer 161

0.1 N NaCl

Answer 162

Fractional distillation

Answer 163

Vacuum distillation

Answer 164

None of these

Answer 165

Distillation

Answer 166

S² m² mol¯²

Answer 167

S m mol¯¹

Answer 168

S² m² mol

Answer 169

S m² mol¯¹

Answer 170

Neutral atom

Answer 171

Does not provide any electron

Answer 172

2.15 cm¯³

Answer 173

1.15 cm¯³

Answer 174

1.81 cm¯³

Answer 175

1.25 cm¯³

Answer 176

Altered reaction in presence of H₂O

Answer 177

Electrochemical phenomenon

Answer 178

Union between two light metals and a heavy metal

Answer 179

Interaction

Answer 180

Refractive index

Answer 181

Surface tension

Answer 182

Osmotic pressure

Answer 183

Sufficient date not given

Answer 184

Na₂SO₄

Answer 185

CH₃ CooNH₄

Answer 186

Daniel cell

Answer 187

Galvanic cell

Answer 188

Electrolytic cell

Answer 189

Slightly less than one

Answer 190

Slightly greater than one

Answer 191

Exactly equal to one

Answer 192

None of these

Answer 193

None of these

Answer 194

By replacing external circuit with external source of electricity

Answer 195

By addition of fresh solution

Answer 196

By heating it

Answer 197

By removal of solution

Answer 198

1.15 g/Cm³

Answer 199

120 g Cm³

Answer 200

1.25g/Cm³

Answer 201

1.2 g/Cm³

Answer 202

Standard oxidation potential

Answer 203

Standard reduction potential

Answer 204

Cell voltage

Answer 205

Ionization potential

Answer 206

Possesses ions even in solid state

Answer 207

Gives ions only when electricity is passed

Answer 208

Forms complex ions in solution

Answer 209

Gives ions only when dissolved in water

Answer 210

Neutralization

Answer 211

Ca(NO₃)₂

Answer 212

Solvent particles

Answer 213

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

Answer 214

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 215

Boiling point of pure water decreases by the addition of ethanol

Answer 216

Boiling point of pure benzene increases by the addition of toluene

Answer 217

Heat energy

Answer 218

Chemical energy

Answer 219

Electrical energy

Answer 220

None of these

Answer 221

302 S cm² mol¯¹

Answer 222

278 S cm² mol¯¹

Answer 223

176 S cm² mol¯¹

Answer 224

128 S cm² mol¯¹

Answer 225

Atoms of Na and Cl.

Answer 226

Free molecules

Answer 227

Free electrons

Answer 228

Drops to zero

Answer 229

Does not change

Answer 230

Increases rapidly

Answer 231

Increases gradually

Answer 232

Not particular

Answer 233

Electrolytic cell

Answer 234

Galvanic cell

Answer 235

Magnetic energy

Answer 236

Electrical energy

Answer 237

Heat energy

Answer 238

Sound energy

Answer 239

1.0 x 10²

Answer 240

4.0 x 10¹²

Answer 241

2.0 x 10¹¹

Answer 242

1.0 x 10¹⁰

Answer 243

Rust removal

Answer 244

Electroplating

Answer 245

Manufacture of bleach

Answer 246

Making leather

Answer 247

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

Answer 248

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

Answer 249

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

Answer 250

Li is smaller in size as compared to Cu

Answer 251

Gold is denser

Answer 252

Gold has lower reduction potential then iron

Answer 253

Gold has higher reduction potential then iron

Answer 254

Iron rusts

Answer 255

Redox potential

Answer 256

Oxidation potential

Answer 257

Reduction potential

Answer 258

e.m.f of cell

Answer 259

Parts per million

Answer 260

Microgram percent

Answer 261

Gram per million

Answer 262

Milligram percent

Answer 263

Non rechargeable

Answer 264

Electrolytic cell

Answer 265

Daniel cell

Answer 266

Rechargeable

Answer 267

Increase in oxidation number of all the elements on reactant side

Answer 268

Increase in oxidation number

Answer 269

Both are possible

Answer 270

Decrease in oxidation number

Answer 271

Sum of reduction and oxidation potentials

Answer 272

1 – 2 α

Answer 273

Henry’s law

Answer 274

Distribution law

Answer 275

Ostwald’s dilution law

Answer 276

Raoult’s law

Answer 277

The extent of dissociation of solute

Answer 278

Degree of solubilization of solute

Answer 279

The extent of dissolution of solute

Answer 280

The degree of decomposition of solution

Answer 281

12157.48 sec

Answer 282

Both A and B

Answer 283

Electroplating

Answer 284

Electrorefining

Answer 285

None of these

Answer 286

Elevation in boiling point

Answer 287

Ionic concentration

Answer 288

Flow of solvent from a concentrated to a dilute solution

Answer 289

Diffusion rate of the solute

Answer 290

Molten NaCl

Answer 291

Dilute solution of glucose

Answer 292

Chloroform

Answer 293

Pure distilled water

Answer 294

Dilution decreases

Answer 295

Pressure increases

Answer 296

Dilution increases

Answer 297

Na⁺ + e– → Na

Answer 298

Na → Na⁺ + e–

Answer 299

Br₂ + 2e – → 2Br –

Answer 300

2Br– → Br₂ + 2e –

Answer 301

None of these

Answer 302

– 0.35 V

Answer 303

– 1.17 V

Answer 304

Create potential difference between two electrodes

Answer 305

Generate heat

Answer 306

Remove adsorbed oxygen from electrode surfaces

Answer 307

Produce high purity water

Answer 308

Hg₂Cl₂

Answer 309

Anode to cathode through the solution

Answer 310

Anode to cathode through the external circuit

Answer 311

Cathode to anode through the external circuit

Answer 312

Cathode to anode through the solution

Answer 313

Hg₂Cl₂

Answer 314

From cathode to anode in outer circuit

Answer 315

From cathode to anode inside the cell

Answer 316

From anode to cathode in an outer circuit

Answer 317

From anode to cathode inside the cell

Answer 318

Both A and B

Answer 319

At cathode

Answer 320

None of these

Answer 321

[Pt(NH₃)₄Cl₄]

Answer 322

[Pt(NH₃)₄Cl]Cl₃

Answer 323

[Pt(NH₃)₄Cl₂]Cl₂

Answer 324

[Pt(NH₃)₄Cl₃]Cl

Answer 325

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

Answer 326

Hg is more inert than Pt

Answer 327

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

Answer 328

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

Answer 329

Molarity of the solvent

Answer 330

Molarity of the solution

Answer 331

Molality of the solution

Answer 332

Mole fraction of the solution

Answer 333

58.5g NaCl/100ml

Answer 334

5.58g NaCl/100m

Answer 335

10.0g NaCl/100ml

Answer 336

20g NaCl/100ml

Answer 337

Electric circuit

Answer 338

No connection exists

Answer 339

Salt Bridge

Answer 340

Decreases slowly

Answer 341

Drops to zero

Answer 342

Does not change

Answer 343

Decrease rapidly

Answer 344

None of these

Answer 345

Slightly more than 1 atom

Answer 346

760 mm of Hg

Answer 347

Both of these

Answer 348

Putting it in saline water

Answer 349

Making iron cathode

Answer 350

None of these

Answer 351

22400 cm³

Answer 352

Non-spontaneous reaction

Answer 353

Neutralization

Answer 354

Spontaneous reaction

Answer 355

0.1 M Sucrose

Answer 356

0.1 M NaCl

Answer 357

0.1 M Glucose

Answer 358

0.1 M BaCl₂

Answer 359

All of these

Answer 360

An electrolytic cell

Answer 361

A galvanic cell

Answer 362

A chemical cell

Answer 363

A voltaic cell

Answer 364

Dilute solution which behave as nearly ideal solution

Answer 365

Neither a nor b

Answer 366

Both a and b

Answer 367

Concentration solutions behave as nearly non – ideal solutions

Answer 368

Both oxidation and reduction

Answer 369

Neither oxidation and reduction

Total Questions:	192
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Total Marks:	192
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