Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. Colligative properties are the properties of

Answer

Dilute solution which behave as nearly ideal solution

Answer

Neither a nor b

Answer

Concentration solutions behave as nearly non – ideal solutions

Answer

Both a and b

Question 2

2. During a redox reaction, an oxidizing agent

Answer

Is oxidized

Answer

Loses electrons

Answer

Is hydrolysed

Answer

Gains electrons

Question 3

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

Answer

Loses electrons

Answer

Gains electrons

Answer

pH is changed

Answer

Acts as a catalyst

Question 4

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

Question 5

5. The solubility of a gas in water depends upon

Answer

Nature of the gas

Answer

All of these

Answer

Temperature

Answer

Pressure of the gas

Question 6

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

Answer

∆ G = -ve

Answer

∆ G = -ve, ∆ E = 0

Answer

∆ G = +ve, ∆ E = 0

Answer

∆ G = 0, ∆E = 0

Question 7

7. Molarity of water is

Question 8

8. The osmotic pressure of 1 m solution at 27°C is

Question 9

9. In alkaline battery anode is made up of

Question 10

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

Answer

Equal to that of ethanol

Answer

Less than that of water

Answer

Equal to that of water

Answer

More than that of H₂O

Question 11

11. Oxidation in a chemical reaction involves

Answer

Increase in oxidation number

Answer

Decrease in oxidation number

Answer

Both are possible

Answer

Increase in oxidation number of all the elements on reactant side

Question 12

12. Potential of Zn is called

Answer

It has not potential

Question 13

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

Question 14

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

Question 15

15. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 16

16. 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)₄Cl]Cl₃

Answer

[Pt(NH₃)₄Cl₃]Cl

Answer

[Pt(NH₃)₄Cl₄]

Answer

[Pt(NH₃)₄Cl₂]Cl₂

Question 17

17. When the solute is present in trace quantities the following expression is used?

Answer

Parts per million

Answer

Microgram percent

Answer

Gram per million

Answer

Milligram percent

Question 18

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

Answer

A galvanic cell

Answer

A voltaic cell

Answer

A chemical cell

Answer

An electrolytic cell

Question 19

19. Temperature for standard electrode potential is

Question 20

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

Question 21

21. The cryoscopic constant of water is 1.86. The elevation of B.P for a 0.1m solution of a solute in water is

Answer

Sufficient date not given

Question 22

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

Answer

H₄P₃O₇

Question 23

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

Answer

Fractional distillation

Answer

Vacuum distillation

Answer

None of these

Answer

Distillation

Question 24

24. The best reducing agent is

Question 25

25. Which of the following is a strong electrolyte?

Answer

Ca(NO₃)₂

Question 26

26. Maximum freezing point falls in

Answer

Naphthalene

Question 27

27. 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

1.0 x 10¹⁰

Answer

2.0 x 10¹¹

Answer

1.0 x 10²

Answer

4.0 x 10¹²

Question 28

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

Question 29

29. A redox reaction involves

Answer

Electron transfer

Answer

A reaction in a solution

Answer

Ion combination reaction

Answer

Proton transfer

Question 30

30. Salt bridge transfers

Question 31

31. Pure water does not conduct electricity because it

Answer

Is neutral

Answer

Is almost unionized

Answer

Is readily decomposed

Answer

Has low boiling point

Question 32

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

Answer

0.1 N NaCl

Question 33

33. 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 34

34. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 35

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

Answer

None of these

Answer

Electrochemical equivalent

Answer

One gm. atomic weight

Answer

One gm. Equivalent weight

Question 36

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

Answer

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

Answer

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

Answer

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

Answer

Hg is more inert than Pt

Question 37

37. 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 38

38. The Vant Hoff factor (i) accounts for

Answer

The extent of dissociation of solute

Answer

The degree of decomposition of solution

Answer

The extent of dissolution of solute

Answer

Degree of solubilization of solute

Question 39

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

Question 40

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

Answer

Does not change

Answer

Increases gradually

Answer

Increases rapidly

Answer

Drops to zero

Question 41

41. 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 42

42. Cathode provides electrons to

Answer

Does not provide any electron

Answer

Neutral atom

Question 43

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

Answer

0.1 M Glucose

Answer

0.1 M NaCl

Answer

0.1 M BaCl₂

Answer

0.1 M Sucrose

Question 44

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

Question 45

45. 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

0.66 cm¯¹

Answer

0.142 cm¯¹

Answer

0.918 cm¯¹

Question 46

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

Question 47

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

Answer

Supersaturated

Answer

Unsaturated

Question 48

48. 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 49

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

Answer

Chemical energy

Answer

Electrical energy

Answer

Heat energy

Answer

None of these

Question 50

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

Answer

Electrolytic cell

Answer

Galvanic cell

Question 51

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

Question 52

52. 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 53

53. Electrode potential of Zn is

Answer

Oxidation-reduction

Answer

Depends on the nature of the coupled electrode

Question 54

54. 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 55

55. 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 56

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

Answer

Melting point

Answer

Inversion point

Answer

Sublimation point

Answer

Boiling point

Question 57

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

Answer

None of these

Question 58

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

Question 59

59. An electrolyte

Answer

Forms complex ions in solution

Answer

Gives ions only when dissolved in water

Answer

Possesses ions even in solid state

Answer

Gives ions only when electricity is passed

Question 60

60. Chemical used in salt bridge is

Question 61

61. The art of electroplating was given by

Answer

Thomas Gradam

Question 62

62. 18g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to

Question 63

63. The weight of pure NaOH required to prepare 250 cm³ of 0.1 N solution is

Question 64

64. In a Galvanic cell, the electrons flow from

Answer

Cathode to anode through the external circuit

Answer

Anode to cathode through the external circuit

Answer

Anode to cathode through the solution

Answer

Cathode to anode through the solution

Answer 122

22400 cm³

Answer 123

Oxidation number neither increases nor decreases

Answer 124

Increase in oxidation number of element

Answer 125

Decrease in oxidation number of element

Answer 126

Increase in oxidation number of the elements in reactants

Answer 127

Making leather

Answer 128

Electroplating

Answer 129

Rust removal

Answer 130

Manufacture of bleach

Answer 131

Hg₂Cl₂

Answer 132

None of these

Answer 133

Ionization potential

Answer 134

Standard reduction potential

Answer 135

Standard oxidation potential

Answer 136

Cell voltage

Answer 137

Hydrolyzed

Answer 138

Precipitated

Answer 139

Neutralization

Answer 140

Non-spontaneous reaction

Answer 141

Spontaneous reaction

Answer 142

760 mm of Hg

Answer 143

800 mm of Hg

Answer 144

750 mm of Hg

Answer 145

780 mm of Hg

Answer 146

Neither oxidation and reduction

Answer 147

Both oxidation and reduction

Answer 148

1.25 cm¯³

Answer 149

1.81 cm¯³

Answer 150

2.15 cm¯³

Answer 151

1.15 cm¯³

Answer 152

12157.48 sec

Answer 153

Ionization potential

Answer 154

Electroplating

Answer 155

Standard electrode potential

Answer 156

Electric change

Answer 157

1.2 g/Cm³

Answer 158

1.25g/Cm³

Answer 159

120 g Cm³

Answer 160

1.15 g/Cm³

Answer 161

None of these

Answer 162

Slightly greater than one

Answer 163

Exactly equal to one

Answer 164

Slightly less than one

Answer 165

None of these

Answer 166

Neutralization

Answer 167

Solvent particles

Answer 168

Gold is denser

Answer 169

Iron rusts

Answer 170

Gold has higher reduction potential then iron

Answer 171

Gold has lower reduction potential then iron

Answer 172

Phosphorus acid

Answer 173

Sulphuric acid

Answer 174

Boric acid

Answer 175

Nitric acid

Answer 176

Molarity of the solvent

Answer 177

Mole fraction of the solution

Answer 178

Molality of the solution

Answer 179

Molarity of the solution

Answer 180

100 g of Cu

Answer 181

96500 g of CU

Answer 182

63.5 g of Cu

Answer 183

31.75 g of Cu

Answer 184

Galvanization

Answer 185

Electrolysis

Answer 186

Photo electrolysis

Answer 187

Cathodic protection

Answer 188

– 1.17 V

Answer 189

– 0.35 V

Answer 190

Metals have high resistance

Answer 191

They are mobile electrons in the metallic structure

Answer 192

Metals are decomposed by current

Answer 193

In metals the ions are free to more

Answer 194

Boiling point of pure benzene increases by the addition of toluene

Answer 195

Boiling point of pure water decreases by the addition of ethanol

Answer 196

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

Answer 197

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 198

Diffusion rate of the solute

Answer 199

Elevation in boiling point

Answer 200

Ionic concentration

Answer 201

Flow of solvent from a concentrated to a dilute solution

Answer 202

Remove adsorbed oxygen from electrode surfaces

Answer 203

Produce high purity water

Answer 204

Create potential difference between two electrodes

Answer 205

Generate heat

Answer 206

Hydrolysis

Answer 207

Ionization

Answer 208

128 S cm² mol¯¹

Answer 209

302 S cm² mol¯¹

Answer 210

176 S cm² mol¯¹

Answer 211

278 S cm² mol¯¹

Answer 212

Not particular

Answer 213

Sum of reduction and oxidation potentials

Answer 214

1 – 2 α

Answer 215

Hg₂Cl₂

Answer 216

S m² mol¯¹

Answer 217

S² m² mol

Answer 218

S² m² mol¯²

Answer 219

S m mol¯¹

Answer 220

Br₂ + 2e – → 2Br –

Answer 221

Na⁺ + e– → Na

Answer 222

2Br– → Br₂ + 2e –

Answer 223

Na → Na⁺ + e–

Answer 224

58.5g NaCl/100ml

Answer 225

20g NaCl/100ml

Answer 226

5.58g NaCl/100m

Answer 227

10.0g NaCl/100ml

Answer 228

Very low ionization potential values

Answer 229

Very high positive value of reduction potential

Answer 230

Reduction potentials are negative

Answer 231

Very high negative values reduction potential

Answer 232

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

Answer 233

Electrons flow from cathode to anode through the external battery

Answer 234

Electrons flow cathode to anode within the electrolytic solution

Answer 235

None of these

Answer 236

Does not change

Answer 237

Drops to zero

Answer 238

Decrease rapidly

Answer 239

Decreases slowly

Answer 240

All of these

Answer 241

From anode to cathode inside the cell

Answer 242

From anode to cathode in an outer circuit

Answer 243

From cathode to anode inside the cell

Answer 244

From cathode to anode in outer circuit

Answer 245

Heat energy

Answer 246

Magnetic energy

Answer 247

Sound energy

Answer 248

Electrical energy

Answer 249

Atoms of Na and Cl.

Answer 250

Free electrons

Answer 251

Free molecules

Answer 252

Reduction occurs at cathode

Answer 253

All electrochemical reactions involve the transfer of electrons

Answer 254

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

Answer 255

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

Answer 256

Cathode is regarded as negative electrode

Answer 257

Electrons are released at anode

Answer 258

Chemical energy is converted into electrical energy

Answer 259

Salt bridge maintains the electrical neutrality of the solution

Answer 260

Any possibility

Answer 261

B.P of water remain constant

Answer 262

B.P of water decrease

Answer 263

B.P of water increase

Answer 264

Non rechargeable

Answer 265

Daniel cell

Answer 266

Electrolytic cell

Answer 267

Rechargeable

Answer 268

It has a very high cryoscopic constant

Answer 269

It is readily available

Answer 270

It is volatile

Answer 271

It is solvent for organic substances

Answer 272

Increases with dilution

Answer 273

Remains unchanged with dilution

Answer 274

Depends on mass of electrolyte

Answer 275

Decreases with dilution

Answer 276

None of these

Answer 277

Dilution decreases

Answer 278

Dilution increases

Answer 279

Pressure increases

Answer 280

Electroplating

Answer 281

Both A and B

Answer 282

Electrorefining

Answer 283

None of these

Answer 284

None of these

Answer 285

Equal to the total volume of the components

Answer 286

Slightly more than the total volume of the components

Answer 287

Slightly less than the total volume of the components

Answer 288

Slightly more than 1 atom

Answer 289

760 mm of Hg

Answer 290

By replacing external circuit with external source of electricity

Answer 291

By addition of fresh solution

Answer 292

By removal of solution

Answer 293

By heating it

Answer 294

Interaction

Answer 295

Altered reaction in presence of H₂O

Answer 296

Electrochemical phenomenon

Answer 297

Union between two light metals and a heavy metal

Answer 298

Distribution law

Answer 299

Ostwald’s dilution law

Answer 300

Raoult’s law

Answer 301

Henry’s law

Answer 302

Both Na⁺ and CI¯

Answer 303

None of these

Answer 304

Electrolytic cell

Answer 305

Galvanic cell

Answer 306

Daniel cell

Answer 307

None of these

Answer 308

Both A and B

Answer 309

At cathode

Answer 310

Electrical energy is converted into heat

Answer 311

Chemical energy is converted into heat

Answer 312

Chemical energy is converted into electricity

Answer 313

Electrical energy is converted into chemical energy

Answer 314

Refractive index

Answer 315

Osmotic pressure

Answer 316

Surface tension

Answer 317

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

Answer 318

Li is smaller in size as compared to Cu

Answer 319

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

Answer 320

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

Answer 321

Hypertonic

Answer 322

Spontaneous acid–base reactions

Answer 323

Spontaneous redox reactions

Answer 324

Non-spontaneous redox reactions

Answer 325

None of these

Answer 326

Electrolysis

Answer 327

Electroplating

Answer 328

Conduction

Answer 329

The free energy of mixing is zero

Answer 330

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

Answer 331

The enthalpy of mixing is zero

Answer 332

The entropy of mixing is zero

Answer 333

CH₃ CooNH₄

Answer 334

Na₂SO₄

Answer 335

H+ and OH-

Answer 336

Arrhenius law

Answer 337

Ostwald’s law

Answer 338

Henry’s law

Answer 339

Raoult’s law

Answer 340

No connection exists

Answer 341

Salt Bridge

Answer 342

Electric circuit

Answer 343

1.06 x 10²

Answer 344

1.06 x 10³

Answer 345

1.06 x 10⁴

Answer 346

Dilute solution of glucose

Answer 347

Molten NaCl

Answer 348

Pure distilled water

Answer 349

Chloroform

Answer 350

Greater negative value of standard reduction potential

Answer 351

Greater positive value of standard reduction potential

Answer 352

Lesser positive value of standard reduction potential

Answer 353

None of these

Answer 354

Ohm¯¹ cm

Answer 355

Ohm cm¯²

Answer 356

Ohm cm¯¹

Answer 357

Ohm¯¹ cm¯¹

Answer 358

Oxidation potential

Answer 359

Redox potential

Answer 360

Reduction potential

Answer 361

e.m.f of cell

Answer 362

Increases on dilution slightly

Answer 363

Depends on density of electrolyte itself.

Answer 364

Does not change on dilution

Answer 365

Decreases on dilution

Answer 366

Strong acid and its salt of weak base

Answer 367

Weak acid and its salt of strong base

Answer 368

A strong acid and its salt of a strong base

Answer 369

Weak acid and its salt of weak base

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