Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. 96500 C of electricity liberates from CuSO₄ solution

Answer

96500 g of CU

Answer

31.75 g of Cu

Answer

63.5 g of Cu

Answer

100 g of Cu

Question 2

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

Answer

Boric acid

Answer

Nitric acid

Answer

Sulphuric acid

Answer

Phosphorus acid

Question 3

3. An electrolyte

Answer

Forms complex ions in solution

Answer

Possesses ions even in solid state

Answer

Gives ions only when electricity is passed

Answer

Gives ions only when dissolved in water

Question 4

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

Answer

Acts as a catalyst

Answer

Loses electrons

Answer

pH is changed

Answer

Gains electrons

Question 5

5. 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 6

6. Density of H₂SO₄ in lead accumulator is

Question 7

7. Colligative properties are the properties of

Answer

Dilute solution which behave as nearly ideal solution

Answer

Both a and b

Answer

Concentration solutions behave as nearly non – ideal solutions

Answer

Neither a nor b

Question 8

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

Question 9

9. 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

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

Answer

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

Answer

Hg is more inert than Pt

Question 10

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

Question 11

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

Answer

0.1 N NaCl

Question 12

12. Pick out the wrong statement. In electrochemical cell

Answer

Electrons are released at anode

Answer

Chemical energy is converted into electrical energy

Answer

Salt bridge maintains the electrical neutrality of the solution

Answer

Cathode is regarded as negative electrode

Question 13

13. Reaction takes place at anode is

Answer

Ionization

Answer

Hydrolysis

Question 14

14. Equal volumes of ethylene glycol (molar mass = 62) and water (molar mass = 18) are mixed. The depression in freezing point of water is (given Kf of water 1.86 K mol¯¹ kg and specific gravity of ethylene glycol is 1.11)

Question 15

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

Answer

Iron rusts

Answer

Gold is denser

Answer

Gold has lower reduction potential then iron

Answer

Gold has higher reduction potential then iron

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)₄Cl₃]Cl

Answer

[Pt(NH₃)₄Cl₂]Cl₂

Answer

[Pt(NH₃)₄Cl]Cl₃

Answer

[Pt(NH₃)₄Cl₄]

Question 17

17. In a chemical reaction, oxidation process involves

Answer

Increase in oxidation number of element

Answer

Increase in oxidation number of the elements in reactants

Answer

Decrease in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Question 18

18. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 19

19. 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 20

20. 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 21

21. Azeotropic mixture of HCl and water has

Question 22

22. In the conversion of Br2 to BrO₃¯¹ the oxidation state of bromine changes from

Question 23

23. The reference electrode is made by using

Answer

Hg₂Cl₂

Question 24

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

Answer

0.1 M Sucrose

Answer

0.1 M Glucose

Answer

0.1 M BaCl₂

Answer

0.1 M NaCl

Question 25

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

Answer

Drops to zero

Answer

Decrease rapidly

Answer

Does not change

Answer

Decreases slowly

Question 26

26. Choose the cell among the following list in which conversation of electrical energy into chemical energy takes place

Answer

Electrolytic cell

Answer

Galvanic cell

Answer

Daniel cell

Question 27

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

Answer

– 0.35 V

Answer

– 1.17 V

Question 28

28. A redox reaction involves

Answer

A reaction in a solution

Answer

Proton transfer

Answer

Ion combination reaction

Answer

Electron transfer

Question 29

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

Question 30

30. 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 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

Electrons flow from cathode to anode through the external battery

Answer

None of these

Answer

Electrons flow cathode to anode within the electrolytic solution

Question 32

32. If liquids A and B form an ideal solution

Answer

The free energy of mixing is zero

Answer

The entropy of mixing is zero

Answer

The enthalpy of mixing is zero

Answer

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

Question 33

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

Question 34

34. Li occupies higher position in the electrochemical series of metals as compared to Cu since

Answer

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

Answer

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

Answer

Li is smaller in size as compared to Cu

Answer

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

Question 35

35. 18g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to

Question 36

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

Question 37

37. Stronger the oxidizing agent, greater is the

Answer

Reduction potential

Answer

Oxidation potential

Answer

Redox potential

Answer

e.m.f of cell

Question 38

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

Question 39

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

Question 40

40. Units of molarity are

Answer

None of these

Question 41

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

Answer

One gm. atomic weight

Answer

None of these

Answer

One gm. Equivalent weight

Answer

Electrochemical equivalent

Question 42

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

Question 43

43. 50 mL of 10 N H₂SO₄. 25 mL of 12 N HCl and 40 mL of 5N HNO₃ are mixed and the volume of the mixture is made 1000 mL by adding water. The normality of resulting solution will be

Question 44

44. By means of fuel cells, chemical energy may be converted into

Answer

Magnetic energy

Answer

Electrical energy

Answer

Sound energy

Answer

Heat energy

Question 45

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

Question 46

46. In electrolytic cell, electricity in carried out by

Answer

Neutralization

Answer

Non-spontaneous reaction

Answer

Spontaneous reaction

Question 47

47. Same amount of electric current is passed through solution if AgNO₃ and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P. in the second case is:

Answer

22400 cm³

Question 48

48. H₂ gas in SHE is filled at a pressure of

Answer

780 mm of Hg

Answer

750 mm of Hg

Answer

760 mm of Hg

Answer

800 mm of Hg

Question 49

49. Potential of Zn is called

Answer

It has not potential

Question 50

50. Electricity in voltaic cell is produced due to

Answer

Neutralization

Question 51

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

Answer

Weak acid and its salt of strong base

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

Question 52

52. 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 53

53. Conductivity (Unit : siemen’s S) is directly proportionally to the area of the vessel and the concentration of the solution in it and is inversely proportional to the length of vessel, then the unit of constant of proportionality is

Answer

S m mol¯¹

Answer

S² m² mol¯²

Answer

S² m² mol

Answer

S m² mol¯¹

Question 54

54. 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 positive value of reduction potential

Answer

Reduction potentials are negative

Answer

Very high negative values reduction potential

Question 55

55. The cathodic reaction in the electrolysis of dil. H₂SO₄ with Pt electrodes is

Answer

Neither oxidation and reduction

Answer

Both oxidation and reduction

Question 56

56. Strong reducing agents have

Answer

None of these

Answer

Greater negative value of standard reduction potential

Answer

Lesser positive value of standard reduction potential

Answer

Greater positive value of standard reduction potential

Question 57

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

Answer

Standard reduction potential

Answer

Cell voltage

Answer

Standard oxidation potential

Answer

Ionization potential

Question 58

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

Question 59

59. Decrease in oxidation number is called

Answer

All of these

Question 60

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

Answer

Distillation

Answer

Vacuum distillation

Answer

Fractional distillation

Answer

None of these

Question 61

61. 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 62

62. Which of the statements given below concerning properties of solution, describe a colligaive effect?

Answer

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

Answer

Boiling point of pure water decreases by the addition of ethanol

Answer

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer

Boiling point of pure benzene increases by the addition of toluene

Question 63

63. 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 64

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

Answer 136

Increases on dilution slightly

Answer 137

Does not change on dilution

Answer 138

Depends on density of electrolyte itself.

Answer 139

Decreases on dilution

Answer 140

1 – 2 α

Answer 141

Dilution decreases

Answer 142

Pressure increases

Answer 143

Dilution increases

Answer 144

Anode to cathode through the external circuit

Answer 145

Cathode to anode through the solution

Answer 146

Cathode to anode through the external circuit

Answer 147

Anode to cathode through the solution

Answer 148

Sum of reduction and oxidation potentials

Answer 149

None of these

Answer 150

Electrolysis

Answer 151

Cathodic protection

Answer 152

Galvanization

Answer 153

Photo electrolysis

Answer 154

12157.48 sec

Answer 155

Electrolysis

Answer 156

Electroplating

Answer 157

Conduction

Answer 158

Equal to the total volume of the components

Answer 159

Slightly less than the total volume of the components

Answer 160

None of these

Answer 161

Slightly more than the total volume of the components

Answer 162

Oxidation-reduction

Answer 163

Depends on the nature of the coupled electrode

Answer 164

Produce high purity water

Answer 165

Remove adsorbed oxygen from electrode surfaces

Answer 166

Generate heat

Answer 167

Create potential difference between two electrodes

Answer 168

A chemical cell

Answer 169

A galvanic cell

Answer 170

A voltaic cell

Answer 171

An electrolytic cell

Answer 172

Dilute solution of glucose

Answer 173

Molten NaCl

Answer 174

Pure distilled water

Answer 175

Chloroform

Answer 176

Ca(NO₃)₂

Answer 177

By removal of solution

Answer 178

By addition of fresh solution

Answer 179

By heating it

Answer 180

By replacing external circuit with external source of electricity

Answer 181

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

Answer 182

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

Answer 183

All electrochemical reactions involve the transfer of electrons

Answer 184

Reduction occurs at cathode

Answer 185

Free molecules

Answer 186

Atoms of Na and Cl.

Answer 187

Free electrons

Answer 188

Precipitated

Answer 189

Hydrolyzed

Answer 190

Increases with dilution

Answer 191

Remains unchanged with dilution

Answer 192

Decreases with dilution

Answer 193

Depends on mass of electrolyte

Answer 194

Metals have high resistance

Answer 195

They are mobile electrons in the metallic structure

Answer 196

In metals the ions are free to more

Answer 197

Metals are decomposed by current

Answer 198

Pressure of the gas

Answer 199

All of these

Answer 200

Temperature

Answer 201

Nature of the gas

Answer 202

It is volatile

Answer 203

It has a very high cryoscopic constant

Answer 204

It is readily available

Answer 205

It is solvent for organic substances

Answer 206

Rust removal

Answer 207

Making leather

Answer 208

Electroplating

Answer 209

Manufacture of bleach

Answer 210

Union between two light metals and a heavy metal

Answer 211

Electrochemical phenomenon

Answer 212

Altered reaction in presence of H₂O

Answer 213

Interaction

Answer 214

Solvent particles

Answer 215

Increases gradually

Answer 216

Drops to zero

Answer 217

Does not change

Answer 218

Increases rapidly

Answer 219

Spontaneous acid–base reactions

Answer 220

None of these

Answer 221

Non-spontaneous redox reactions

Answer 222

Spontaneous redox reactions

Answer 223

Both A and B

Answer 224

At cathode

Answer 225

None of these

Answer 226

Electrical energy is converted into chemical energy

Answer 227

Chemical energy is converted into heat

Answer 228

Chemical energy is converted into electricity

Answer 229

Electrical energy is converted into heat

Answer 230

Does not provide any electron

Answer 231

Neutral atom

Answer 232

From anode to cathode inside the cell

Answer 233

From cathode to anode in outer circuit

Answer 234

From cathode to anode inside the cell

Answer 235

From anode to cathode in an outer circuit

Answer 236

H+ and OH-

Answer 237

None of these

Answer 238

Both Na⁺ and CI¯

Answer 239

B.P of water remain constant

Answer 240

B.P of water decrease

Answer 241

Any possibility

Answer 242

B.P of water increase

Answer 243

Both of these

Answer 244

Putting it in saline water

Answer 245

None of these

Answer 246

Making iron cathode

Answer 247

The degree of decomposition of solution

Answer 248

The extent of dissociation of solute

Answer 249

The extent of dissolution of solute

Answer 250

Degree of solubilization of solute

Answer 251

0.918 cm¯¹

Answer 252

0.66 cm¯¹

Answer 253

1.12 cm¯¹

Answer 254

0.142 cm¯¹

Answer 255

Unsaturated

Answer 256

Supersaturated

Answer 257

1.25 cm¯³

Answer 258

2.15 cm¯³

Answer 259

1.81 cm¯³

Answer 260

1.15 cm¯³

Answer 261

Rechargeable

Answer 262

Daniel cell

Answer 263

Electrolytic cell

Answer 264

Non rechargeable

Answer 265

1.15 g/Cm³

Answer 266

120 g Cm³

Answer 267

1.2 g/Cm³

Answer 268

1.25g/Cm³

Answer 269

Elevation in boiling point

Answer 270

Flow of solvent from a concentrated to a dilute solution

Answer 271

Diffusion rate of the solute

Answer 272

Ionic concentration

Answer 273

Electrical energy

Answer 274

None of these

Answer 275

Chemical energy

Answer 276

Heat energy

Answer 277

Hypertonic

Answer 278

Gram per million

Answer 279

Microgram percent

Answer 280

Parts per million

Answer 281

Milligram percent

Answer 282

1.06 x 10³

Answer 283

1.06 x 10⁴

Answer 284

1.06 x 10²

Answer 285

1.0 x 10¹⁰

Answer 286

2.0 x 10¹¹

Answer 287

1.0 x 10²

Answer 288

4.0 x 10¹²

Answer 289

Loses electrons

Answer 290

Is hydrolysed

Answer 291

Is oxidized

Answer 292

Gains electrons

Answer 293

Molarity of the solvent

Answer 294

Molarity of the solution

Answer 295

Molality of the solution

Answer 296

Mole fraction of the solution

Answer 297

Thomas Gradam

Answer 298

Equal to that of ethanol

Answer 299

Equal to that of water

Answer 300

More than that of H₂O

Answer 301

Less than that of water

Answer 302

Boiling point

Answer 303

Inversion point

Answer 304

Sublimation point

Answer 305

Melting point

Answer 306

Standard electrode potential

Answer 307

Electric change

Answer 308

Ionization potential

Answer 309

Electroplating

Answer 310

Osmotic pressure

Answer 311

Surface tension

Answer 312

Refractive index

Answer 313

Na, Pt and graphite

Answer 314

Pt and graphite only

Answer 315

Na and S only

Answer 316

H₄P₃O₇

Answer 317

Na⁺ + e– → Na

Answer 318

Na → Na⁺ + e–

Answer 319

2Br– → Br₂ + 2e –

Answer 320

Br₂ + 2e – → 2Br –

Answer 321

Na₂SO₄

Answer 322

CH₃ CooNH₄

Answer 323

Both are possible

Answer 324

Increase in oxidation number

Answer 325

Increase in oxidation number of all the elements on reactant side

Answer 326

Decrease in oxidation number

Answer 327

None of these

Answer 328

Electrorefining

Answer 329

Electroplating

Answer 330

None of these

Answer 331

Both A and B

Answer 332

Not particular

Answer 333

Henry’s law

Answer 334

Raoult’s law

Answer 335

Arrhenius law

Answer 336

Ostwald’s law

Answer 337

5.58g NaCl/100m

Answer 338

58.5g NaCl/100ml

Answer 339

20g NaCl/100ml

Answer 340

10.0g NaCl/100ml

Answer 341

∆ G = +ve, ∆ E = 0

Answer 342

∆ G = 0, ∆E = 0

Answer 343

∆ G = -ve

Answer 344

∆ G = -ve, ∆ E = 0

Answer 345

176 S cm² mol¯¹

Answer 346

128 S cm² mol¯¹

Answer 347

302 S cm² mol¯¹

Answer 348

278 S cm² mol¯¹

Answer 349

Salt Bridge

Answer 350

No connection exists

Answer 351

Electric circuit

Answer 352

Exactly equal to one

Answer 353

None of these

Answer 354

Slightly greater than one

Answer 355

Slightly less than one

Answer 356

Hg₂Cl₂

Answer 357

760 mm of Hg

Answer 358

Slightly more than 1 atom

Answer 359

Ohm¯¹ cm

Answer 360

Ohm cm¯¹

Answer 361

Ohm cm¯²

Answer 362

Ohm¯¹ cm¯¹

Answer 363

Distribution law

Answer 364

Henry’s law

Answer 365

Ostwald’s dilution law

Answer 366

Raoult’s law

Answer 367

Galvanic cell

Answer 368

Electrolytic cell

Answer 369

Naphthalene

Total Questions:	192
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Total Marks:	192
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