Chemistry Electro Chemistry Online Mcqs Test

Q: How can I prepare for Chemistry Electro Chemistry Online Mcqs Test?

You can prepare for Chemistry Electro Chemistry Online Mcqs Test by attempting the free online quizzes at Gotest.com.pk. We provide instant results, performance reports, and detailed explanations for every question.

Question 1

1. In a Galvanic cell

Answer

Chemical energy is converted into electricity

Answer

Electrical energy is converted into chemical energy

Answer

Chemical energy is converted into heat

Answer

Electrical energy is converted into heat

Question 2

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

Answer

1.81 cm¯³

Answer

1.15 cm¯³

Answer

2.15 cm¯³

Answer

1.25 cm¯³

Question 3

3. Temperature for standard electrode potential is

Question 4

4. 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 5

5. In an electrolytic cell current flows

Answer

From anode to cathode in an outer circuit

Answer

From cathode to anode in outer circuit

Answer

From anode to cathode inside the cell

Answer

From cathode to anode inside the cell

Question 6

6. 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 7

7. Vant Hoff’s factor of Ca(NO₃)₂ is

Question 8

8. Maximum freezing point falls in

Answer

Naphthalene

Question 9

9. The depression of freezing point is directly proportional to

Answer

Mole fraction of the solution

Answer

Molality of the solution

Answer

Molarity of the solution

Answer

Molarity of the solvent

Question 10

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

Question 11

11. 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 12

12. In alkaline battery the anode is made up of

Question 13

13. In a chemical reaction, oxidation process involves

Answer

Decrease in oxidation number of element

Answer

Increase in oxidation number of the elements in reactants

Answer

Increase in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Question 14

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

Answer

Acts as a catalyst

Answer

pH is changed

Answer

Loses electrons

Answer

Gains electrons

Question 15

15. 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 16

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

Answer

Chloroform

Answer

Molten NaCl

Answer

Pure distilled water

Answer

Dilute solution of glucose

Question 17

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

Question 18

18. 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 19

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

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. Density of H₂SO₄ in lead accumulator is

Question 22

22. Chemical used in salt bridge is

Question 23

23. When common salt is dissolved in water

Answer

B.P of water remain constant

Answer

B.P of water increase

Answer

B.P of water decrease

Answer

Any possibility

Question 24

24. 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 strong base

Answer

Weak acid and its salt of weak base

Question 25

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

Question 26

26. If the standard electrode potential of CU²⁺/Cu electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of Cu²⁺? (T = 298 K)

Question 27

27. The best reducing agent is

Question 28

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

Question 29

29. The art of electroplating was given by

Answer

Thomas Gradam

Question 30

30. 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 31

31. Specific conductivity of a solution

Answer

Remains unchanged with dilution

Answer

Increases with dilution

Answer

Decreases with dilution

Answer

Depends on mass of electrolyte

Question 32

32. Oxidation number of carbon in NaHCO₃ is

Question 33

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

Answer

∆ G = -ve, ∆ E = 0

Answer

∆ G = -ve

Answer

∆ G = 0, ∆E = 0

Answer

∆ G = +ve, ∆ E = 0

Question 34

34. Secondary cell is

Answer

Electrolytic cell

Answer

Non rechargeable

Answer

Rechargeable

Answer

Daniel cell

Question 35

35. Oxidation in a chemical reaction involves

Answer

Increase in oxidation number of all the elements on reactant side

Answer

Decrease in oxidation number

Answer

Increase in oxidation number

Answer

Both are possible

Question 36

36. Best way to prevent rusting iron is by

Answer

None of these

Answer

Both of these

Answer

Putting it in saline water

Answer

Making iron cathode

Question 37

37. 18g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to

Question 38

38. The limiting molar conductivities ʌ’ for NaCl, KBr and KCl are 126, 152 and 150 S cm² respectively. The ʌ’ for NaBr is

Answer

302 S cm² mol¯¹

Answer

278 S cm² mol¯¹

Answer

176 S cm² mol¯¹

Answer

128 S cm² mol¯¹

Question 39

39. Cathode provides electrons to

Answer

Neutral atom

Answer

Does not provide any electron

Question 40

40. Corrosion is basically a

Answer

Altered reaction in presence of H₂O

Answer

Union between two light metals and a heavy metal

Answer

Interaction

Answer

Electrochemical phenomenon

Question 41

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

Answer

Manufacture of bleach

Answer

Rust removal

Answer

Making leather

Answer

Electroplating

Question 42

42. 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 43

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

Answer

– 0.35 V

Answer

– 1.17 V

Question 44

44. Colligative properties are the properties of

Answer

Neither a nor b

Answer

Concentration solutions behave as nearly non – ideal solutions

Answer

Dilute solution which behave as nearly ideal solution

Answer

Both a and b

Question 45

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

Question 46

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

Question 47

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

Question 48

48. A redox reaction involves

Answer

Ion combination reaction

Answer

Electron transfer

Answer

A reaction in a solution

Answer

Proton transfer

Question 49

49. Voltaic cell can be recharged by

Answer

By addition of fresh solution

Answer

By removal of solution

Answer

By heating it

Answer

By replacing external circuit with external source of electricity

Question 50

50. Salt bridge transfers

Answer

Solvent particles

Question 51

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

Question 52

52. 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 53

53. Decrease in oxidation number is called

Answer

All of these

Question 54

54. Which one of the following substance when dissolved in water give acidic solution

Answer

Na₂SO₄

Answer

CH₃ CooNH₄

Question 55

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

Question 56

56. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 57

57. 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 58

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

Answer

Sound energy

Answer

Electrical energy

Answer

Magnetic energy

Answer

Heat energy

Question 59

59. 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 60

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

Answer

Flow of solvent from a concentrated to a dilute solution

Answer

Ionic concentration

Answer

Elevation in boiling point

Answer

Diffusion rate of the solute

Question 61

61. The degree of dissociation of weak electrolyte increases as

Answer

Dilution increases

Answer

Pressure increases

Answer

Dilution decreases

Question 62

62. Units of molarity are

Answer

None of these

Question 63

63. Azeotropic mixture of HCl and water has

Question 64

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

Answer 108

Hypertonic

Answer 109

Salt bridge maintains the electrical neutrality of the solution

Answer 110

Electrons are released at anode

Answer 111

Cathode is regarded as negative electrode

Answer 112

Chemical energy is converted into electrical energy

Answer 113

Daniel cell

Answer 114

Galvanic cell

Answer 115

Electrolytic cell

Answer 116

Sulphuric acid

Answer 117

Phosphorus acid

Answer 118

Boric acid

Answer 119

Nitric acid

Answer 120

Electroplating

Answer 121

Electrolysis

Answer 122

Conduction

Answer 123

760 mm of Hg

Answer 124

Slightly more than 1 atom

Answer 125

H₄P₃O₇

Answer 126

Oxidation potential

Answer 127

Reduction potential

Answer 128

e.m.f of cell

Answer 129

Redox potential

Answer 130

Hg₂Cl₂

Answer 131

Gold has higher reduction potential then iron

Answer 132

Gold is denser

Answer 133

Iron rusts

Answer 134

Gold has lower reduction potential then iron

Answer 135

5.58g NaCl/100m

Answer 136

58.5g NaCl/100ml

Answer 137

10.0g NaCl/100ml

Answer 138

20g NaCl/100ml

Answer 139

Very high negative values reduction potential

Answer 140

Very high positive value of reduction potential

Answer 141

Very low ionization potential values

Answer 142

Reduction potentials are negative

Answer 143

None of these

Answer 144

At cathode

Answer 145

Both A and B

Answer 146

Both A and B

Answer 147

Electrorefining

Answer 148

None of these

Answer 149

Electroplating

Answer 150

Unsaturated

Answer 151

Supersaturated

Answer 152

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 153

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

Answer 154

Boiling point of pure benzene increases by the addition of toluene

Answer 155

Boiling point of pure water decreases by the addition of ethanol

Answer 156

0.1 N NaCl

Answer 157

Does not change

Answer 158

Decreases slowly

Answer 159

Drops to zero

Answer 160

Decrease rapidly

Answer 161

1.06 x 10⁴

Answer 162

1.06 x 10²

Answer 163

1.06 x 10³

Answer 164

Sublimation point

Answer 165

Boiling point

Answer 166

Melting point

Answer 167

Inversion point

Answer 168

1.0 x 10²

Answer 169

1.0 x 10¹⁰

Answer 170

4.0 x 10¹²

Answer 171

2.0 x 10¹¹

Answer 172

One gm. atomic weight

Answer 173

One gm. Equivalent weight

Answer 174

Electrochemical equivalent

Answer 175

None of these

Answer 176

It is readily available

Answer 177

It is volatile

Answer 178

It is solvent for organic substances

Answer 179

It has a very high cryoscopic constant

Answer 180

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

Answer 181

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

Answer 182

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

Answer 183

Hg is more inert than Pt

Answer 184

Electrolysis

Answer 185

Cathodic protection

Answer 186

Galvanization

Answer 187

Photo electrolysis

Answer 188

None of these

Answer 189

Slightly less than one

Answer 190

Exactly equal to one

Answer 191

Slightly greater than one

Answer 192

Neutralization

Answer 193

Spontaneous reaction

Answer 194

Non-spontaneous reaction

Answer 195

0.1 M Glucose

Answer 196

0.1 M BaCl₂

Answer 197

0.1 M Sucrose

Answer 198

0.1 M NaCl

Answer 199

Not particular

Answer 200

Greater positive value of standard reduction potential

Answer 201

Lesser positive value of standard reduction potential

Answer 202

None of these

Answer 203

Greater negative value of standard reduction potential

Answer 204

Forms complex ions in solution

Answer 205

Gives ions only when electricity is passed

Answer 206

Possesses ions even in solid state

Answer 207

Gives ions only when dissolved in water

Answer 208

They are mobile electrons in the metallic structure

Answer 209

Metals are decomposed by current

Answer 210

In metals the ions are free to more

Answer 211

Metals have high resistance

Answer 212

Is almost unionized

Answer 213

Is readily decomposed

Answer 214

Is neutral

Answer 215

Has low boiling point

Answer 216

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

Answer 217

Li is smaller in size as compared to Cu

Answer 218

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

Answer 219

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

Answer 220

Increases rapidly

Answer 221

Drops to zero

Answer 222

Does not change

Answer 223

Increases gradually

Answer 224

Sufficient date not given

Answer 225

Less than that of water

Answer 226

Equal to that of ethanol

Answer 227

More than that of H₂O

Answer 228

Equal to that of water

Answer 229

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

Answer 230

Reduction occurs at cathode

Answer 231

All electrochemical reactions involve the transfer of electrons

Answer 232

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

Answer 233

Precipitated

Answer 234

Hydrolyzed

Answer 235

S² m² mol¯²

Answer 236

S m² mol¯¹

Answer 237

S m mol¯¹

Answer 238

S² m² mol

Answer 239

Cathode to anode through the external circuit

Answer 240

Cathode to anode through the solution

Answer 241

Anode to cathode through the solution

Answer 242

Anode to cathode through the external circuit

Answer 243

None of these

Answer 244

Both Na⁺ and CI¯

Answer 245

760 mm of Hg

Answer 246

800 mm of Hg

Answer 247

780 mm of Hg

Answer 248

750 mm of Hg

Answer 249

Fractional distillation

Answer 250

None of these

Answer 251

Distillation

Answer 252

Vacuum distillation

Answer 253

Slightly less than the total volume of the components

Answer 254

None of these

Answer 255

Slightly more than the total volume of the components

Answer 256

Equal to the total volume of the components

Answer 257

Electrons flow cathode to anode within the electrolytic solution

Answer 258

Electrons flow from cathode to anode through the external battery

Answer 259

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

Answer 260

None of these

Answer 261

1.2 g/Cm³

Answer 262

120 g Cm³

Answer 263

1.15 g/Cm³

Answer 264

1.25g/Cm³

Answer 265

Hg₂Cl₂

Answer 266

Loses electrons

Answer 267

Is hydrolysed

Answer 268

Is oxidized

Answer 269

Gains electrons

Answer 270

H+ and OH-

Answer 271

Na, Pt and graphite

Answer 272

Na and S only

Answer 273

Pt and graphite only

Answer 274

0.66 cm¯¹

Answer 275

0.142 cm¯¹

Answer 276

0.918 cm¯¹

Answer 277

1.12 cm¯¹

Answer 278

Ca(NO₃)₂

Answer 279

Ionization

Answer 280

Hydrolysis

Answer 281

A galvanic cell

Answer 282

An electrolytic cell

Answer 283

A voltaic cell

Answer 284

A chemical cell

Answer 285

Galvanic cell

Answer 286

Electrolytic cell

Answer 287

Neutralization

Answer 288

Non-spontaneous redox reactions

Answer 289

None of these

Answer 290

Spontaneous acid–base reactions

Answer 291

Spontaneous redox reactions

Answer 292

None of these

Answer 293

Standard oxidation potential

Answer 294

Standard reduction potential

Answer 295

Cell voltage

Answer 296

Ionization potential

Answer 297

Heat energy

Answer 298

Chemical energy

Answer 299

Electrical energy

Answer 300

None of these

Answer 301

Depends on density of electrolyte itself.

Answer 302

Decreases on dilution

Answer 303

Increases on dilution slightly

Answer 304

Does not change on dilution

Answer 305

Surface tension

Answer 306

Refractive index

Answer 307

Osmotic pressure

Answer 308

[Pt(NH₃)₄Cl₃]Cl

Answer 309

[Pt(NH₃)₄Cl₄]

Answer 310

[Pt(NH₃)₄Cl]Cl₃

Answer 311

[Pt(NH₃)₄Cl₂]Cl₂

Answer 312

Generate heat

Answer 313

Remove adsorbed oxygen from electrode surfaces

Answer 314

Produce high purity water

Answer 315

Create potential difference between two electrodes

Answer 316

63.5 g of Cu

Answer 317

31.75 g of Cu

Answer 318

96500 g of CU

Answer 319

100 g of Cu

Answer 320

Electric circuit

Answer 321

No connection exists

Answer 322

Salt Bridge

Answer 323

12157.48 sec

Answer 324

None of these

Answer 325

Oxidation-reduction

Answer 326

Depends on the nature of the coupled electrode

Answer 327

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

Answer 328

The free energy of mixing is zero

Answer 329

The entropy of mixing is zero

Answer 330

The enthalpy of mixing is zero

Answer 331

Electroplating

Answer 332

Electric change

Answer 333

Ionization potential

Answer 334

Standard electrode potential

Answer 335

Free molecules

Answer 336

Free electrons

Answer 337

Atoms of Na and Cl.

Answer 338

Ohm¯¹ cm

Answer 339

Ohm¯¹ cm¯¹

Answer 340

Ohm cm¯²

Answer 341

Ohm cm¯¹

Answer 342

Arrhenius law

Answer 343

Raoult’s law

Answer 344

Henry’s law

Answer 345

Ostwald’s law

Answer 346

All of these

Answer 347

Nature of the gas

Answer 348

Temperature

Answer 349

Pressure of the gas

Answer 350

Gram per million

Answer 351

Parts per million

Answer 352

Milligram percent

Answer 353

Microgram percent

Answer 354

It has not potential

Answer 355

The degree of decomposition of solution

Answer 356

The extent of dissolution of solute

Answer 357

Degree of solubilization of solute

Answer 358

The extent of dissociation of solute

Answer 359

Sum of reduction and oxidation potentials

Answer 360

Henry’s law

Answer 361

Distribution law

Answer 362

Raoult’s law

Answer 363

Ostwald’s dilution law

Answer 364

Na → Na⁺ + e–

Answer 365

Na⁺ + e– → Na

Answer 366

Br₂ + 2e – → 2Br –

Answer 367

2Br– → Br₂ + 2e –

Answer 368

Neither oxidation and reduction

Answer 369

Both oxidation and reduction

Total Questions:	192
Time Allowed:	60 Minutes
Total Marks:	192
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Electro Chemistry Online Mcqs Test

Important Electro Chemistry Question and Answer

Electro Chemistry Practice Test Online With Explanation

Chemistry

How to Score High in Chemistry Electro Chemistry Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Malik Tahir

One Comment

Leave a Reply Cancel reply

Important Electro Chemistry Question and Answer

Electro Chemistry Practice Test Online With Explanation

Chemistry

How to Score High in Chemistry Electro Chemistry Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Latest Updates

Malik Tahir

One Comment

Leave a Reply Cancel reply