Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. 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 2

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

Question 3

3. 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

4.0 x 10¹²

Answer

1.0 x 10²

Question 4

4. Vant Hoff’s factor of Ca(NO₃)₂ is

Question 5

5. Potential of Zn is called

Answer

It has not potential

Question 6

6. Molton NaCl conducts electricity due to the presence of

Answer

Free electrons

Answer

Atoms of Na and Cl.

Answer

Free molecules

Question 7

7. 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 8

8. The half-reaction that occurs at the anode during the electrolysis of molten sodium bromide is:

Answer

2Br– → Br₂ + 2e –

Answer

Na → Na⁺ + e–

Answer

Na⁺ + e– → Na

Answer

Br₂ + 2e – → 2Br –

Question 9

9. Alkaline battery has a voltage of

Question 10

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

Answer

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer

Boiling point of pure benzene increases by the addition of toluene

Answer

Boiling point of pure water decreases by the addition of ethanol

Answer

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

Question 11

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

Question 12

12. In alkaline battery anode is made up of

Question 13

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

Question 14

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

Answer

None of these

Question 15

15. 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

Answer

S² m² mol¯²

Answer

S m² mol¯¹

Question 16

16. Electrode potential of Zn is

Answer

Oxidation-reduction

Answer

Depends on the nature of the coupled electrode

Question 17

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

Answer

Microgram percent

Answer

Parts per million

Answer

Milligram percent

Answer

Gram per million

Question 18

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

Answer

Hg₂Cl₂

Question 19

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

Question 20

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

Answer

800 mm of Hg

Answer

780 mm of Hg

Answer

750 mm of Hg

Answer

760 mm of Hg

Question 21

21. The unit of specific conductivity is

Answer

Ohm cm¯²

Answer

Ohm¯¹ cm

Answer

Ohm cm¯¹

Answer

Ohm¯¹ cm¯¹

Question 22

22. 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 23

23. 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

All electrochemical reactions involve the transfer of electrons

Answer

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

Question 24

24. Reduction always occurs

Answer

None of these

Answer

At cathode

Answer

Both A and B

Question 25

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

Answer

None of these

Answer

Both A and B

Answer

Electroplating

Answer

Electrorefining

Question 26

26. The depression of freezing point is directly proportional to

Answer

Mole fraction of the solution

Answer

Molarity of the solvent

Answer

Molarity of the solution

Answer

Molality of the solution

Question 27

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

Question 28

28. In a Galvanic cell

Answer

Electrical energy is converted into heat

Answer

Electrical energy is converted into chemical energy

Answer

Chemical energy is converted into electricity

Answer

Chemical energy is converted into heat

Question 29

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

Answer

Elevation in boiling point

Answer

Ionic concentration

Answer

Diffusion rate of the solute

Answer

Flow of solvent from a concentrated to a dilute solution

Question 32

32. Corrosion reactions are

Answer

None of these

Answer

Non-spontaneous redox reactions

Answer

Spontaneous acid–base reactions

Answer

Spontaneous redox reactions

Question 33

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

Question 34

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

Answer

Osmotic pressure

Answer

Refractive index

Answer

Surface tension

Question 35

35. 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 36

36. What are the ions present in water?

Answer

H+ and OH-

Question 37

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

Answer

Chloroform

Answer

Pure distilled water

Answer

Molten NaCl

Answer

Dilute solution of glucose

Question 38

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

Answer

Heat energy

Answer

Electrical energy

Answer

None of these

Answer

Chemical energy

Question 39

39. Mole fraction of pure water is

Answer

Exactly equal to one

Answer

Slightly greater than one

Answer

Slightly less than one

Answer

None of these

Question 40

40. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 41

41. Oxidation state of hydrogen in CaH₂ is

Question 42

42. 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

Li is smaller in size as compared to Cu

Answer

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

Answer

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

Question 43

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

Answer

Electrolytic cell

Answer

Galvanic cell

Question 44

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

Answer

0.1 M Sucrose

Answer

0.1 M NaCl

Answer

0.1 M Glucose

Answer

0.1 M BaCl₂

Question 45

45. Half cells are interconnected through

Answer

Electric circuit

Answer

No connection exists

Answer

Salt Bridge

Question 46

46. 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 47

47. In an electrolytic cell current flows

Answer

From cathode to anode in outer circuit

Answer

From anode to cathode in an outer circuit

Answer

From anode to cathode inside the cell

Answer

From cathode to anode inside the cell

Question 48

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

Answer

Both Na⁺ and CI¯

Answer

None of these

Question 49

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

Answer

5.58g NaCl/100m

Answer

10.0g NaCl/100ml

Answer

58.5g NaCl/100ml

Answer

20g NaCl/100ml

Question 50

50. What will be the density of H₂SO₄ when lead accumulator is recharged?

Answer

1.81 cm¯³

Answer

1.15 cm¯³

Answer

1.25 cm¯³

Answer

2.15 cm¯³

Question 51

51. An electrolyte

Answer

Possesses ions even in solid state

Answer

Forms complex ions in solution

Answer

Gives ions only when dissolved in water

Answer

Gives ions only when electricity is passed

Question 52

52. Maximum freezing point falls in

Answer

Naphthalene

Question 53

53. Salt bridge transfers

Answer

Solvent particles

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

Question 56

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

Question 57

57. 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

Hg is more inert than 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

Question 58

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

Question 59

59. Which of these is not an application of electrolysis?

Answer

Rust removal

Answer

Manufacture of bleach

Answer

Electroplating

Answer

Making leather

Question 60

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

Question 61

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

Question 62

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

Answer

An electrolytic cell

Answer

A chemical cell

Answer

A voltaic cell

Answer

A galvanic cell

Question 63

63. 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 high negative values reduction potential

Answer

Very low ionization potential values

Answer

Reduction potentials are negative

Question 64

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

Answer

Cell voltage

Answer

Ionization potential

Answer

Standard reduction potential

Answer

Standard oxidation potential

Answer 134

100 g of Cu

Answer 135

63.5 g of Cu

Answer 136

31.75 g of Cu

Answer 137

96500 g of CU

Answer 138

All of these

Answer 139

Nature of the gas

Answer 140

Pressure of the gas

Answer 141

Temperature

Answer 142

Thomas Gradam

Answer 143

Phosphorus acid

Answer 144

Nitric acid

Answer 145

Sulphuric acid

Answer 146

Boric acid

Answer 147

Spontaneous reaction

Answer 148

Non-spontaneous reaction

Answer 149

Neutralization

Answer 150

Increase in oxidation number of all the elements on reactant side

Answer 151

Both are possible

Answer 152

Decrease in oxidation number

Answer 153

Increase in oxidation number

Answer 154

Generate heat

Answer 155

Remove adsorbed oxygen from electrode surfaces

Answer 156

Produce high purity water

Answer 157

Create potential difference between two electrodes

Answer 158

Neutralization

Answer 159

Cathode to anode through the external circuit

Answer 160

Anode to cathode through the external circuit

Answer 161

Cathode to anode through the solution

Answer 162

Anode to cathode through the solution

Answer 163

None of these

Answer 164

Electrolysis

Answer 165

Electroplating

Answer 166

Conduction

Answer 167

By addition of fresh solution

Answer 168

By heating it

Answer 169

By replacing external circuit with external source of electricity

Answer 170

By removal of solution

Answer 171

Daniel cell

Answer 172

Electrolytic cell

Answer 173

Galvanic cell

Answer 174

Gold is denser

Answer 175

Gold has higher reduction potential then iron

Answer 176

Iron rusts

Answer 177

Gold has lower reduction potential then iron

Answer 178

Slightly more than 1 atom

Answer 179

760 mm of Hg

Answer 180

The free energy of mixing is zero

Answer 181

The enthalpy of mixing is zero

Answer 182

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

Answer 183

The entropy of mixing is zero

Answer 184

Photo electrolysis

Answer 185

Galvanization

Answer 186

Electrolysis

Answer 187

Cathodic protection

Answer 188

More than that of H₂O

Answer 189

Equal to that of water

Answer 190

Less than that of water

Answer 191

Equal to that of ethanol

Answer 192

H₄P₃O₇

Answer 193

Supersaturated

Answer 194

Unsaturated

Answer 195

[Pt(NH₃)₄Cl₃]Cl

Answer 196

[Pt(NH₃)₄Cl]Cl₃

Answer 197

[Pt(NH₃)₄Cl₄]

Answer 198

[Pt(NH₃)₄Cl₂]Cl₂

Answer 199

One gm. atomic weight

Answer 200

Electrochemical equivalent

Answer 201

None of these

Answer 202

One gm. Equivalent weight

Answer 203

– 1.17 V

Answer 204

– 0.35 V

Answer 205

Ostwald’s law

Answer 206

Raoult’s law

Answer 207

Henry’s law

Answer 208

Arrhenius law

Answer 209

Neutral atom

Answer 210

Does not provide any electron

Answer 211

Electrochemical phenomenon

Answer 212

Altered reaction in presence of H₂O

Answer 213

Interaction

Answer 214

Union between two light metals and a heavy metal

Answer 215

O₂, SO₂

Answer 216

None of these

Answer 217

Is almost unionized

Answer 218

Is neutral

Answer 219

Is readily decomposed

Answer 220

Has low boiling point

Answer 221

Increases with dilution

Answer 222

Decreases with dilution

Answer 223

Depends on mass of electrolyte

Answer 224

Remains unchanged with dilution

Answer 225

∆ G = 0, ∆E = 0

Answer 226

∆ G = -ve

Answer 227

∆ G = +ve, ∆ E = 0

Answer 228

∆ G = -ve, ∆ E = 0

Answer 229

Ionization potential

Answer 230

Standard electrode potential

Answer 231

Electric change

Answer 232

Electroplating

Answer 233

0.66 cm¯¹

Answer 234

1.12 cm¯¹

Answer 235

0.142 cm¯¹

Answer 236

0.918 cm¯¹

Answer 237

Gains electrons

Answer 238

Loses electrons

Answer 239

Is hydrolysed

Answer 240

Is oxidized

Answer 241

Decrease rapidly

Answer 242

Decreases slowly

Answer 243

Does not change

Answer 244

Drops to zero

Answer 245

None of these

Answer 246

Putting it in saline water

Answer 247

Making iron cathode

Answer 248

Both of these

Answer 249

All of these

Answer 250

12157.48 sec

Answer 251

Melting point

Answer 252

Inversion point

Answer 253

Sublimation point

Answer 254

Boiling point

Answer 255

Rechargeable

Answer 256

Non rechargeable

Answer 257

Electrolytic cell

Answer 258

Daniel cell

Answer 259

Na₂SO₄

Answer 260

CH₃ CooNH₄

Answer 261

Oxidation number neither increases nor decreases

Answer 262

Increase in oxidation number of element

Answer 263

Increase in oxidation number of the elements in reactants

Answer 264

Decrease in oxidation number of element

Answer 265

Does not change on dilution

Answer 266

Decreases on dilution

Answer 267

Increases on dilution slightly

Answer 268

Depends on density of electrolyte itself.

Answer 269

pH is changed

Answer 270

Acts as a catalyst

Answer 271

Gains electrons

Answer 272

Loses electrons

Answer 273

Any possibility

Answer 274

B.P of water decrease

Answer 275

B.P of water increase

Answer 276

B.P of water remain constant

Answer 277

Slightly more than the total volume of the components

Answer 278

Equal to the total volume of the components

Answer 279

None of these

Answer 280

Slightly less than the total volume of the components

Answer 281

Hydrolysis

Answer 282

Ionization

Answer 283

Distillation

Answer 284

Fractional distillation

Answer 285

None of these

Answer 286

Vacuum distillation

Answer 287

0.1 N NaCl

Answer 288

None of these

Answer 289

Increases rapidly

Answer 290

Increases gradually

Answer 291

Does not change

Answer 292

Drops to zero

Answer 293

22400 cm³

Answer 294

Metals have high resistance

Answer 295

In metals the ions are free to more

Answer 296

They are mobile electrons in the metallic structure

Answer 297

Metals are decomposed by current

Answer 298

Hg₂Cl₂

Answer 299

Dilution decreases

Answer 300

Pressure increases

Answer 301

Dilution increases

Answer 302

Not particular

Answer 303

Oxidation potential

Answer 304

Redox potential

Answer 305

Reduction potential

Answer 306

e.m.f of cell

Answer 307

Sum of reduction and oxidation potentials

Answer 308

Heat energy

Answer 309

Magnetic energy

Answer 310

Electrical energy

Answer 311

Sound energy

Answer 312

Hydrolyzed

Answer 313

Precipitated

Answer 314

1 – 2 α

Answer 315

Ca(NO₃)₂

Answer 316

Raoult’s law

Answer 317

Distribution law

Answer 318

Henry’s law

Answer 319

Ostwald’s dilution law

Answer 320

128 S cm² mol¯¹

Answer 321

302 S cm² mol¯¹

Answer 322

176 S cm² mol¯¹

Answer 323

278 S cm² mol¯¹

Answer 324

Hypertonic

Answer 325

Neither oxidation and reduction

Answer 326

Both oxidation and reduction

Answer 327

A strong acid and its salt of a strong base

Answer 328

Weak acid and its salt of strong base

Answer 329

Strong acid and its salt of weak base

Answer 330

Weak acid and its salt of weak base

Answer 331

Greater positive value of standard reduction potential

Answer 332

Lesser positive value of standard reduction potential

Answer 333

None of these

Answer 334

Greater negative value of standard reduction potential

Answer 335

1.15 g/Cm³

Answer 336

120 g Cm³

Answer 337

1.25g/Cm³

Answer 338

1.2 g/Cm³

Answer 339

Proton transfer

Answer 340

Ion combination reaction

Answer 341

A reaction in a solution

Answer 342

Electron transfer

Answer 343

The extent of dissociation of solute

Answer 344

The degree of decomposition of solution

Answer 345

The extent of dissolution of solute

Answer 346

Degree of solubilization of solute

Answer 347

Electrons flow cathode to anode within the electrolytic solution

Answer 348

None of these

Answer 349

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

Answer 350

Electrons flow from cathode to anode through the external battery

Answer 351

Na, Pt and graphite

Answer 352

Na and S only

Answer 353

Pt and graphite only

Answer 354

Chemical energy is converted into electrical energy

Answer 355

Cathode is regarded as negative electrode

Answer 356

Electrons are released at anode

Answer 357

Salt bridge maintains the electrical neutrality of the solution

Answer 358

None of these

Answer 359

It has a very high cryoscopic constant

Answer 360

It is volatile

Answer 361

It is solvent for organic substances

Answer 362

It is readily available

Answer 363

1.06 x 10⁴

Answer 364

1.06 x 10³

Answer 365

1.06 x 10²

Answer 366

Dilute solution which behave as nearly ideal solution

Answer 367

Both a and b

Answer 368

Concentration solutions behave as nearly non – ideal solutions

Answer 369

Neither a nor b

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