Chemistry Electro Chemistry Online Mcqs Test

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Question 1

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

Answer

Drops to zero

Answer

Does not change

Answer

Decrease rapidly

Answer

Decreases slowly

Question 2

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

Answer

None of these

Question 3

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

Question 4

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

Answer

H₄P₃O₇

Question 5

5. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 6

6. 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 10²

Answer

1.06 x 10³

Answer

1.06 x 10⁴

Question 7

7. Out of Cu, Ag, Fe and Zn the metal which can displace all others from their salt solutions is

Question 8

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

Answer

Cathodic protection

Answer

Galvanization

Answer

Photo electrolysis

Answer

Electrolysis

Question 9

9. 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 10

10. An electrolyte

Answer

Forms complex ions in solution

Answer

Gives ions only when electricity is passed

Answer

Possesses ions even in solid state

Answer

Gives ions only when dissolved in water

Question 11

11. Voltaic cell can be recharged by

Answer

By heating it

Answer

By replacing external circuit with external source of electricity

Answer

By removal of solution

Answer

By addition of fresh solution

Question 12

12. 18g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to

Question 13

13. Which of the following statements is FALSE?

Answer

All electrochemical reactions involve the transfer of electrons

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

Reduction occurs at cathode

Question 14

14. Density of H₂SO₄ in lead accumulator is

Question 15

15. The pressure at which water boils at 101.5 °c is

Answer

760 mm of Hg

Answer

Slightly more than 1 atom

Question 16

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

Question 17

17. In electrolytic cell, electricity in carried out by

Answer

Non-spontaneous reaction

Answer

Spontaneous reaction

Answer

Neutralization

Question 18

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

Question 19

19. 96500 C of electricity liberates from CuSO₄ solution

Answer

100 g of Cu

Answer

63.5 g of Cu

Answer

96500 g of CU

Answer

31.75 g of Cu

Question 20

20. If α is the degree of dissociation of Na₂SO₄ the Vant Hoff’s factor (i) used for calculating the molecular mass is

Answer

1 – 2 α

Question 21

21. 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 22

22. Of the following, the metal that cannot be obtained by electrolysis of aqueous solution of their salts are:

Question 23

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

Question 24

24. The unit of specific conductivity is

Answer

Ohm¯¹ cm

Answer

Ohm cm¯²

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯¹

Question 25

25. 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 26

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

Answer

0.1 N NaCl

Question 27

27. The best reducing agent is

Question 28

28. 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 29

29. Reduction always occurs

Answer

At cathode

Answer

None of these

Answer

Both A and B

Question 30

30. 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 31

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

Answer

Increases gradually

Answer

Drops to zero

Answer

Increases rapidly

Answer

Does not change

Question 32

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

Answer

Molten NaCl

Answer

Chloroform

Answer

Pure distilled water

Answer

Dilute solution of glucose

Question 33

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

Question 34

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

Question 35

35. 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 36

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

Question 37

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

Answer

None of these

Answer

O₂, SO₂

Question 38

38. Corrosion reactions are

Answer

Spontaneous redox reactions

Answer

Non-spontaneous redox reactions

Answer

Spontaneous acid–base reactions

Answer

None of these

Question 39

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

Answer

0.1 M Sucrose

Answer

0.1 M BaCl₂

Answer

0.1 M Glucose

Answer

0.1 M NaCl

Question 40

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

Question 41

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

Question 42

42. Oxidation number of carbon in NaHCO₃ is

Question 43

43. 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 44

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

Answer

Loses electrons

Answer

Acts as a catalyst

Answer

Gains electrons

Answer

pH is changed

Question 45

45. 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 46

46. 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 47

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

Question 48

48. Chemical used in salt bridge is

Question 49

49. The solubility of a gas in water depends upon

Answer

Nature of the gas

Answer

Temperature

Answer

All of these

Answer

Pressure of the gas

Question 50

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

Answer

Ostwald’s dilution law

Answer

Henry’s law

Answer

Raoult’s law

Answer

Distribution law

Question 51

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

Question 52

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

Question 53

53. 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 high positive value of reduction potential

Answer

Very low ionization potential values

Answer

Reduction potentials are negative

Answer

Very high negative values reduction potential

Question 54

54. Which has maximum oxidation number

Question 55

55. 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 56

56. A cell constant is generally found by measuring the conductivity of aqueous solution of

Question 57

57. Choose the best reducing agent among the following

Question 58

58. 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

Question 59

59. The reference calomel electrode is made from which of the following?

Answer

Hg₂Cl₂

Question 60

60. The depression of freezing point is directly proportional to

Answer

Molality of the solution

Answer

Molarity of the solution

Answer

Mole fraction of the solution

Answer

Molarity of the solvent

Question 61

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

Answer

Conduction

Answer

Electroplating

Answer

Electrolysis

Question 62

62. 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 63

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

Question 64

64. After adding a solute freezing point of solvent decreases to -0.186. Calculate ∆ Tb if Kf = 1.86 and Kb = 0.521

Answer 100

0.66 cm¯¹

Answer 101

0.918 cm¯¹

Answer 102

1.12 cm¯¹

Answer 103

0.142 cm¯¹

Answer 104

1.25 cm¯³

Answer 105

2.15 cm¯³

Answer 106

1.15 cm¯³

Answer 107

1.81 cm¯³

Answer 108

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

Answer 109

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

Answer 110

Hg is more inert than Pt

Answer 111

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

Answer 112

12157.48 sec

Answer 113

1.2 g/Cm³

Answer 114

1.15 g/Cm³

Answer 115

120 g Cm³

Answer 116

1.25g/Cm³

Answer 117

Electron transfer

Answer 118

A reaction in a solution

Answer 119

Proton transfer

Answer 120

Ion combination reaction

Answer 121

None of these

Answer 122

Slightly less than one

Answer 123

Slightly greater than one

Answer 124

Exactly equal to one

Answer 125

278 S cm² mol¯¹

Answer 126

176 S cm² mol¯¹

Answer 127

302 S cm² mol¯¹

Answer 128

128 S cm² mol¯¹

Answer 129

Decrease in oxidation number of element

Answer 130

Increase in oxidation number of element

Answer 131

Increase in oxidation number of the elements in reactants

Answer 132

Oxidation number neither increases nor decreases

Answer 133

It is solvent for organic substances

Answer 134

It is volatile

Answer 135

It is readily available

Answer 136

It has a very high cryoscopic constant

Answer 137

Supersaturated

Answer 138

Unsaturated

Answer 139

Equal to that of ethanol

Answer 140

Equal to that of water

Answer 141

More than that of H₂O

Answer 142

Less than that of water

Answer 143

Free molecules

Answer 144

Atoms of Na and Cl.

Answer 145

Free electrons

Answer 146

Both Na⁺ and CI¯

Answer 147

None of these

Answer 148

Neutralization

Answer 149

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

Answer 150

Li is smaller in size as compared to Cu

Answer 151

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

Answer 152

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

Answer 153

Making iron cathode

Answer 154

Putting it in saline water

Answer 155

None of these

Answer 156

Both of these

Answer 157

Produce high purity water

Answer 158

Remove adsorbed oxygen from electrode surfaces

Answer 159

Create potential difference between two electrodes

Answer 160

Generate heat

Answer 161

Greater negative value of standard reduction potential

Answer 162

Lesser positive value of standard reduction potential

Answer 163

None of these

Answer 164

Greater positive value of standard reduction potential

Answer 165

∆ G = 0, ∆E = 0

Answer 166

∆ G = -ve, ∆ E = 0

Answer 167

∆ G = -ve

Answer 168

∆ G = +ve, ∆ E = 0

Answer 169

Daniel cell

Answer 170

Galvanic cell

Answer 171

Electrolytic cell

Answer 172

All of these

Answer 173

Raoult’s law

Answer 174

Arrhenius law

Answer 175

Ostwald’s law

Answer 176

Henry’s law

Answer 177

Degree of solubilization of solute

Answer 178

The degree of decomposition of solution

Answer 179

The extent of dissolution of solute

Answer 180

The extent of dissociation of solute

Answer 181

Electrical energy is converted into heat

Answer 182

Chemical energy is converted into electricity

Answer 183

Electrical energy is converted into chemical energy

Answer 184

Chemical energy is converted into heat

Answer 185

Has low boiling point

Answer 186

Is readily decomposed

Answer 187

Is neutral

Answer 188

Is almost unionized

Answer 189

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

Answer 190

The enthalpy of mixing is zero

Answer 191

The entropy of mixing is zero

Answer 192

The free energy of mixing is zero

Answer 193

Boiling point of pure benzene increases by the addition of toluene

Answer 194

Vapour pressure of pure benzene decreases by the addition of naphthalene

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

[Pt(NH₃)₄Cl₃]Cl

Answer 198

[Pt(NH₃)₄Cl]Cl₃

Answer 199

[Pt(NH₃)₄Cl₄]

Answer 200

[Pt(NH₃)₄Cl₂]Cl₂

Answer 201

Milligram percent

Answer 202

Parts per million

Answer 203

Gram per million

Answer 204

Microgram percent

Answer 205

Hypertonic

Answer 206

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

Answer 207

None of these

Answer 208

Electrons flow cathode to anode within the electrolytic solution

Answer 209

Electrons flow from cathode to anode through the external battery

Answer 210

None of these

Answer 211

Salt bridge maintains the electrical neutrality of the solution

Answer 212

Electrons are released at anode

Answer 213

Chemical energy is converted into electrical energy

Answer 214

Cathode is regarded as negative electrode

Answer 215

Solvent particles

Answer 216

A voltaic cell

Answer 217

A chemical cell

Answer 218

A galvanic cell

Answer 219

An electrolytic cell

Answer 220

Sulphuric acid

Answer 221

Phosphorus acid

Answer 222

Boric acid

Answer 223

Nitric acid

Answer 224

H+ and OH-

Answer 225

Does not provide any electron

Answer 226

Neutral atom

Answer 227

Electroplating

Answer 228

Ionization potential

Answer 229

Standard electrode potential

Answer 230

Electric change

Answer 231

Thomas Gradam

Answer 232

Dilution increases

Answer 233

Dilution decreases

Answer 234

Pressure increases

Answer 235

Both oxidation and reduction

Answer 236

Neither oxidation and reduction

Answer 237

Magnetic energy

Answer 238

Electrical energy

Answer 239

Heat energy

Answer 240

Sound energy

Answer 241

Cathode to anode through the external circuit

Answer 242

Anode to cathode through the solution

Answer 243

Anode to cathode through the external circuit

Answer 244

Cathode to anode through the solution

Answer 245

From cathode to anode inside the cell

Answer 246

From cathode to anode in outer circuit

Answer 247

From anode to cathode in an outer circuit

Answer 248

From anode to cathode inside the cell

Answer 249

22400 cm³

Answer 250

Na₂SO₄

Answer 251

CH₃ CooNH₄

Answer 252

Electrolytic cell

Answer 253

Galvanic cell

Answer 254

Not particular

Answer 255

Electroplating

Answer 256

None of these

Answer 257

Both A and B

Answer 258

Electrorefining

Answer 259

20g NaCl/100ml

Answer 260

10.0g NaCl/100ml

Answer 261

58.5g NaCl/100ml

Answer 262

5.58g NaCl/100m

Answer 263

A strong acid and its salt of a strong base

Answer 264

Strong acid and its salt of weak base

Answer 265

Weak acid and its salt of strong base

Answer 266

Weak acid and its salt of weak base

Answer 267

It has not potential

Answer 268

2.0 x 10¹¹

Answer 269

1.0 x 10¹⁰

Answer 270

4.0 x 10¹²

Answer 271

1.0 x 10²

Answer 272

None of these

Answer 273

Chemical energy

Answer 274

Heat energy

Answer 275

Electrical energy

Answer 276

Redox potential

Answer 277

e.m.f of cell

Answer 278

Reduction potential

Answer 279

Oxidation potential

Answer 280

Increases on dilution slightly

Answer 281

Depends on density of electrolyte itself.

Answer 282

Decreases on dilution

Answer 283

Does not change on dilution

Answer 284

Increase in oxidation number

Answer 285

Both are possible

Answer 286

Decrease in oxidation number

Answer 287

Increase in oxidation number of all the elements on reactant side

Answer 288

– 0.35 V

Answer 289

– 1.17 V

Answer 290

Diffusion rate of the solute

Answer 291

Elevation in boiling point

Answer 292

Flow of solvent from a concentrated to a dilute solution

Answer 293

Ionic concentration

Answer 294

B.P of water remain constant

Answer 295

B.P of water increase

Answer 296

B.P of water decrease

Answer 297

Any possibility

Answer 298

One gm. atomic weight

Answer 299

Electrochemical equivalent

Answer 300

None of these

Answer 301

One gm. Equivalent weight

Answer 302

Na⁺ + e– → Na

Answer 303

Br₂ + 2e – → 2Br –

Answer 304

2Br– → Br₂ + 2e –

Answer 305

Na → Na⁺ + e–

Answer 306

760 mm of Hg

Answer 307

780 mm of Hg

Answer 308

750 mm of Hg

Answer 309

800 mm of Hg

Answer 310

Naphthalene

Answer 311

Precipitated

Answer 312

Hydrolyzed

Answer 313

Fractional distillation

Answer 314

Vacuum distillation

Answer 315

Distillation

Answer 316

None of these

Answer 317

Ionization

Answer 318

Hydrolysis

Answer 319

Ca(NO₃)₂

Answer 320

None of these

Answer 321

Electrolytic cell

Answer 322

Non rechargeable

Answer 323

Daniel cell

Answer 324

Rechargeable

Answer 325

Neither a nor b

Answer 326

Concentration solutions behave as nearly non – ideal solutions

Answer 327

Both a and b

Answer 328

Dilute solution which behave as nearly ideal solution

Answer 329

S² m² mol

Answer 330

S² m² mol¯²

Answer 331

S m² mol¯¹

Answer 332

S m mol¯¹

Answer 333

Standard oxidation potential

Answer 334

Cell voltage

Answer 335

Standard reduction potential

Answer 336

Ionization potential

Answer 337

No connection exists

Answer 338

Salt Bridge

Answer 339

Electric circuit

Answer 340

Pt and graphite only

Answer 341

Na and S only

Answer 342

Na, Pt and graphite

Answer 343

Gold has lower reduction potential then iron

Answer 344

Iron rusts

Answer 345

Gold is denser

Answer 346

Gold has higher reduction potential then iron

Answer 347

Metals have high resistance

Answer 348

They are mobile electrons in the metallic structure

Answer 349

Metals are decomposed by current

Answer 350

In metals the ions are free to more

Answer 351

Is hydrolysed

Answer 352

Is oxidized

Answer 353

Gains electrons

Answer 354

Loses electrons

Answer 355

Refractive index

Answer 356

Surface tension

Answer 357

Osmotic pressure

Answer 358

Depends on the nature of the coupled electrode

Answer 359

Oxidation-reduction

Answer 360

Depends on mass of electrolyte

Answer 361

Increases with dilution

Answer 362

Decreases with dilution

Answer 363

Remains unchanged with dilution

Answer 364

Electroplating

Answer 365

Manufacture of bleach

Answer 366

Making leather

Answer 367

Rust removal

Answer 368

Hg₂Cl₂

Answer 369

None of these

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