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. Molton NaCl conducts electricity due to the presence of

Answer

Free electrons

Answer

Free molecules

Answer

Atoms of Na and Cl.

Question 2

2. Anode electrode element always have _________ position in electrochemical series

Answer

Not particular

Question 3

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

Question 4

4. Which of the following is a strong electrolyte?

Answer

Ca(NO₃)₂

Question 5

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

Answer

Both oxidation and reduction

Answer

Neither oxidation and reduction

Question 6

6. When a metal is dipped in 1 molar of its solution at 298k, then potential set up is called

Answer

Electric change

Answer

Electroplating

Answer

Standard electrode potential

Answer

Ionization potential

Question 7

7. Oxidation number of carbon in NaHCO₃ is

Question 8

8. Oxidation state of hydrogen in CaH₂ is

Question 9

9. Strong reducing agents have

Answer

Greater positive value of standard reduction potential

Answer

None of these

Answer

Greater negative value of standard reduction potential

Answer

Lesser positive value of standard reduction potential

Question 10

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

Answer

H₄P₃O₇

Question 11

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

Answer

5.58g NaCl/100m

Answer

20g NaCl/100ml

Answer

10.0g NaCl/100ml

Answer

58.5g NaCl/100ml

Question 12

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

Question 13

13. 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

Oxidation number neither increases nor decreases

Answer

Decrease in oxidation number of element

Question 14

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

Question 15

15. 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

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

Answer

Boiling point of pure benzene increases by the addition of toluene

Answer

Boiling point of pure water decreases by the addition of ethanol

Question 16

16. The unit of specific conductivity is

Answer

Ohm¯¹ cm

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯²

Answer

Ohm cm¯¹

Question 17

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

Answer

Does not change

Answer

Increases gradually

Answer

Drops to zero

Answer

Increases rapidly

Question 18

18. When common salt is dissolved in water

Answer

B.P of water remain constant

Answer

Any possibility

Answer

B.P of water decrease

Answer

B.P of water increase

Question 19

19. Vant Hoff’s factor of Ca(NO₃)₂ is

Question 20

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

Answer

Elevation in boiling point

Answer

Diffusion rate of the solute

Answer

Ionic concentration

Answer

Flow of solvent from a concentrated to a dilute solution

Question 21

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

Question 22

22. 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 cathode to anode within the electrolytic solution

Answer

Electrons flow from cathode to anode through the external battery

Answer

None of these

Question 23

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

Question 24

24. 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 25

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

Answer

Electrolytic cell

Answer

Galvanic cell

Question 26

26. In a Galvanic cell

Answer

Electrical energy is converted into chemical energy

Answer

Chemical energy is converted into electricity

Answer

Chemical energy is converted into heat

Answer

Electrical energy is converted into heat

Question 27

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

Question 28

28. An aqueous solution freezes at -0.186°C. (Kf = 1.86, Kb = 0.512). What is the elevation in boiling point?

Question 29

29. 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 30

30. When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

Question 31

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

Question 32

32. 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

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

Answer

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

Question 33

33. Corrosion reactions are

Answer

Spontaneous redox reactions

Answer

Non-spontaneous redox reactions

Answer

Spontaneous acid–base reactions

Answer

None of these

Question 34

34. In alkaline battery anode is made up of

Question 35

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

Answer

Nitric acid

Answer

Phosphorus acid

Answer

Sulphuric acid

Answer

Boric acid

Question 36

36. 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

2.0 x 10¹¹

Answer

1.0 x 10²

Answer

1.0 x 10¹⁰

Answer

4.0 x 10¹²

Question 37

37. The solubility of a gas in water depends upon

Answer

Temperature

Answer

Pressure of the gas

Answer

All of these

Answer

Nature of the gas

Question 38

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

Question 39

39. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 40

40. The equivalent conductivity of 0.1 M week acid is 100 times less than that at infinite dilution. The degree of dissociation is

Question 41

41. In electrolytic cell, electricity in carried out by

Answer

Non-spontaneous reaction

Answer

Spontaneous reaction

Answer

Neutralization

Question 42

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

Question 43

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

Question 44

44. A redox reaction involves

Answer

Electron transfer

Answer

A reaction in a solution

Answer

Proton transfer

Answer

Ion combination reaction

Question 45

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

Answer

Electroplating

Answer

Making leather

Answer

Rust removal

Answer

Manufacture of bleach

Question 46

46. Secondary cell is

Answer

Daniel cell

Answer

Rechargeable

Answer

Non rechargeable

Answer

Electrolytic cell

Question 47

47. What are the ions present in water?

Answer

H+ and OH-

Question 48

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

Question 49

49. Specific conductivity of a solution

Answer

Decreases with dilution

Answer

Remains unchanged with dilution

Answer

Increases with dilution

Answer

Depends on mass of electrolyte

Question 50

50. The depression of freezing point is directly proportional to

Answer

Molality of the solution

Answer

Mole fraction of the solution

Answer

Molarity of the solvent

Answer

Molarity of the solution

Question 51

51. 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 52

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

Answer

None of these

Answer

Electrorefining

Answer

Electroplating

Answer

Both A and B

Question 53

53. The conductivity of strong electrolyte

Answer

Depends on density of electrolyte itself.

Answer

Increases on dilution slightly

Answer

Decreases on dilution

Answer

Does not change on dilution

Question 54

54. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 55

55. 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 56

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

Question 57

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

Answer

760 mm of Hg

Answer

780 mm of Hg

Answer

750 mm of Hg

Answer

800 mm of Hg

Question 58

58. Pick out the wrong statement. In electrochemical cell

Answer

Salt bridge maintains the electrical neutrality of the solution

Answer

Cathode is regarded as negative electrode

Answer

Electrons are released at anode

Answer

Chemical energy is converted into electrical energy

Question 59

59. 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 10⁴

Answer

1.06 x 10²

Answer

1.06 x 10³

Question 60

60. Molarity of water is

Question 61

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

Answer

None of these

Question 62

62. 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 63

63. 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 64

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

Answer

Iron rusts

Answer

Gold has lower reduction potential then iron

Answer

Gold is denser

Answer

Gold has higher reduction potential then iron

Answer 126

Electric circuit

Answer 127

Salt Bridge

Answer 128

No connection exists

Answer 129

One gm. atomic weight

Answer 130

None of these

Answer 131

One gm. Equivalent weight

Answer 132

Electrochemical equivalent

Answer 133

Gram per million

Answer 134

Milligram percent

Answer 135

Microgram percent

Answer 136

Parts per million

Answer 137

Ionization potential

Answer 138

Standard reduction potential

Answer 139

Cell voltage

Answer 140

Standard oxidation potential

Answer 141

2Br– → Br₂ + 2e –

Answer 142

Na → Na⁺ + e–

Answer 143

Na⁺ + e– → Na

Answer 144

Br₂ + 2e – → 2Br –

Answer 145

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

Answer 146

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

Answer 147

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

Answer 148

Li is smaller in size as compared to Cu

Answer 149

A galvanic cell

Answer 150

A chemical cell

Answer 151

An electrolytic cell

Answer 152

A voltaic cell

Answer 153

1.12 cm¯¹

Answer 154

0.918 cm¯¹

Answer 155

0.66 cm¯¹

Answer 156

0.142 cm¯¹

Answer 157

Unsaturated

Answer 158

Supersaturated

Answer 159

Remove adsorbed oxygen from electrode surfaces

Answer 160

Produce high purity water

Answer 161

Create potential difference between two electrodes

Answer 162

Generate heat

Answer 163

Increase in oxidation number

Answer 164

Both are possible

Answer 165

Increase in oxidation number of all the elements on reactant side

Answer 166

Decrease in oxidation number

Answer 167

Does not change

Answer 168

Decrease rapidly

Answer 169

Decreases slowly

Answer 170

Drops to zero

Answer 171

Reduction potentials are negative

Answer 172

Very high positive value of reduction potential

Answer 173

Very high negative values reduction potential

Answer 174

Very low ionization potential values

Answer 175

Dilution increases

Answer 176

Dilution decreases

Answer 177

Pressure increases

Answer 178

Hypertonic

Answer 179

Cathode to anode through the external circuit

Answer 180

Anode to cathode through the external circuit

Answer 181

Anode to cathode through the solution

Answer 182

Cathode to anode through the solution

Answer 183

[Pt(NH₃)₄Cl]Cl₃

Answer 184

[Pt(NH₃)₄Cl₄]

Answer 185

[Pt(NH₃)₄Cl₃]Cl

Answer 186

[Pt(NH₃)₄Cl₂]Cl₂

Answer 187

Hg₂Cl₂

Answer 188

It is volatile

Answer 189

It is readily available

Answer 190

It has a very high cryoscopic constant

Answer 191

It is solvent for organic substances

Answer 192

Osmotic pressure

Answer 193

Refractive index

Answer 194

Surface tension

Answer 195

None of these

Answer 196

96500 g of CU

Answer 197

100 g of Cu

Answer 198

31.75 g of Cu

Answer 199

63.5 g of Cu

Answer 200

Hydrolyzed

Answer 201

Precipitated

Answer 202

The extent of dissociation of solute

Answer 203

The degree of decomposition of solution

Answer 204

The extent of dissolution of solute

Answer 205

Degree of solubilization of solute

Answer 206

Oxidation-reduction

Answer 207

Depends on the nature of the coupled electrode

Answer 208

The entropy of mixing is zero

Answer 209

The enthalpy of mixing is zero

Answer 210

The free energy of mixing is zero

Answer 211

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

Answer 212

All of these

Answer 213

Loses electrons

Answer 214

Is oxidized

Answer 215

Gains electrons

Answer 216

Is hydrolysed

Answer 217

Na, Pt and graphite

Answer 218

Pt and graphite only

Answer 219

Na and S only

Answer 220

Hg₂Cl₂

Answer 221

None of these

Answer 222

Both A and B

Answer 223

At cathode

Answer 224

0.1 M BaCl₂

Answer 225

0.1 M Sucrose

Answer 226

0.1 M Glucose

Answer 227

0.1 M NaCl

Answer 228

More than that of H₂O

Answer 229

Less than that of water

Answer 230

Equal to that of ethanol

Answer 231

Equal to that of water

Answer 232

Solvent particles

Answer 233

Inversion point

Answer 234

Sublimation point

Answer 235

Melting point

Answer 236

Boiling point

Answer 237

0.1 N NaCl

Answer 238

1.2 g/Cm³

Answer 239

1.25g/Cm³

Answer 240

120 g Cm³

Answer 241

1.15 g/Cm³

Answer 242

760 mm of Hg

Answer 243

Slightly more than 1 atom

Answer 244

278 S cm² mol¯¹

Answer 245

302 S cm² mol¯¹

Answer 246

176 S cm² mol¯¹

Answer 247

128 S cm² mol¯¹

Answer 248

S² m² mol¯²

Answer 249

S m mol¯¹

Answer 250

S² m² mol

Answer 251

S m² mol¯¹

Answer 252

From anode to cathode inside the cell

Answer 253

From cathode to anode in outer circuit

Answer 254

From anode to cathode in an outer circuit

Answer 255

From cathode to anode inside the cell

Answer 256

Electrolysis

Answer 257

Cathodic protection

Answer 258

Galvanization

Answer 259

Photo electrolysis

Answer 260

Slightly greater than one

Answer 261

Slightly less than one

Answer 262

None of these

Answer 263

Exactly equal to one

Answer 264

– 1.17 V

Answer 265

– 0.35 V

Answer 266

By replacing external circuit with external source of electricity

Answer 267

By removal of solution

Answer 268

By addition of fresh solution

Answer 269

By heating it

Answer 270

1.15 cm¯³

Answer 271

1.25 cm¯³

Answer 272

2.15 cm¯³

Answer 273

1.81 cm¯³

Answer 274

Molten NaCl

Answer 275

Chloroform

Answer 276

Pure distilled water

Answer 277

Dilute solution of glucose

Answer 278

Acts as a catalyst

Answer 279

Loses electrons

Answer 280

pH is changed

Answer 281

Gains electrons

Answer 282

Is almost unionized

Answer 283

Has low boiling point

Answer 284

Is neutral

Answer 285

Is readily decomposed

Answer 286

Neutralization

Answer 287

Weak acid and its salt of strong base

Answer 288

Weak acid and its salt of weak base

Answer 289

A strong acid and its salt of a strong base

Answer 290

Strong acid and its salt of weak base

Answer 291

Union between two light metals and a heavy metal

Answer 292

Altered reaction in presence of H₂O

Answer 293

Interaction

Answer 294

Electrochemical phenomenon

Answer 295

Naphthalene

Answer 296

Sum of reduction and oxidation potentials

Answer 297

Reduction potential

Answer 298

Redox potential

Answer 299

Oxidation potential

Answer 300

e.m.f of cell

Answer 301

Distribution law

Answer 302

Ostwald’s dilution law

Answer 303

Raoult’s law

Answer 304

Henry’s law

Answer 305

1 – 2 α

Answer 306

22400 cm³

Answer 307

Chemical energy

Answer 308

Electrical energy

Answer 309

None of these

Answer 310

Heat energy

Answer 311

Thomas Gradam

Answer 312

None of these

Answer 313

CH₃ CooNH₄

Answer 314

Na₂SO₄

Answer 315

Galvanic cell

Answer 316

Daniel cell

Answer 317

Electrolytic cell

Answer 318

Neither a nor b

Answer 319

Concentration solutions behave as nearly non – ideal solutions

Answer 320

Both a and b

Answer 321

Dilute solution which behave as nearly ideal solution

Answer 322

Putting it in saline water

Answer 323

None of these

Answer 324

Making iron cathode

Answer 325

Both of these

Answer 326

∆ G = -ve

Answer 327

∆ G = -ve, ∆ E = 0

Answer 328

∆ G = 0, ∆E = 0

Answer 329

∆ G = +ve, ∆ E = 0

Answer 330

Sufficient date not given

Answer 331

It has not potential

Answer 332

Hydrolysis

Answer 333

Ionization

Answer 334

Both Na⁺ and CI¯

Answer 335

None of these

Answer 336

Conduction

Answer 337

Electroplating

Answer 338

Electrolysis

Answer 339

12157.48 sec

Answer 340

Reduction occurs at cathode

Answer 341

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

Answer 342

All electrochemical reactions involve the transfer of electrons

Answer 343

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

Answer 344

Ostwald’s law

Answer 345

Henry’s law

Answer 346

Raoult’s law

Answer 347

Arrhenius law

Answer 348

Slightly less than the total volume of the components

Answer 349

None of these

Answer 350

Equal to the total volume of the components

Answer 351

Slightly more than the total volume of the components

Answer 352

Vacuum distillation

Answer 353

Distillation

Answer 354

Fractional distillation

Answer 355

None of these

Answer 356

Metals are decomposed by current

Answer 357

They are mobile electrons in the metallic structure

Answer 358

In metals the ions are free to more

Answer 359

Metals have high resistance

Answer 360

Does not provide any electron

Answer 361

Neutral atom

Answer 362

Forms complex ions in solution

Answer 363

Gives ions only when electricity is passed

Answer 364

Gives ions only when dissolved in water

Answer 365

Possesses ions even in solid state

Answer 366

Electrical energy

Answer 367

Magnetic energy

Answer 368

Heat energy

Answer 369

Sound energy

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