Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. It azeotropic mixture showing positive deviation from Rault’s law, the volume of the mixture is

Answer

None of these

Answer

Slightly less than the total volume of the components

Answer

Equal to the total volume of the components

Answer

Slightly more than the total volume of the components

Question 2

2. The vapour pressure of two liquids ‘P’ and ‘Q’ are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

Question 3

3. The unit of specific conductivity is

Answer

Ohm cm¯²

Answer

Ohm¯¹ cm

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯¹

Question 4

4. Colligative properties are the properties of

Answer

Concentration solutions behave as nearly non – ideal solutions

Answer

Both a and b

Answer

Dilute solution which behave as nearly ideal solution

Answer

Neither a nor b

Question 5

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

Question 6

6. Maximum freezing point falls in

Answer

Naphthalene

Question 7

7. 96500 C of electricity liberates from CuSO₄ solution

Answer

96500 g of CU

Answer

100 g of Cu

Answer

31.75 g of Cu

Answer

63.5 g of Cu

Question 8

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

Answer

0.1 N NaCl

Question 9

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

Question 10

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

Answer

Electrical energy

Answer

Magnetic energy

Answer

Sound energy

Answer

Heat energy

Question 11

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

Answer

Boiling point of pure benzene increases by the addition of toluene

Answer

Vapour pressure of pure benzene decreases by the addition of naphthalene

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 12

12. Mole fraction of pure water is

Answer

Slightly less than one

Answer

None of these

Answer

Exactly equal to one

Answer

Slightly greater than one

Question 13

13. The art of electroplating was given by

Answer

Thomas Gradam

Question 14

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

Answer

Diffusion rate of the solute

Answer

Elevation in boiling point

Answer

Ionic concentration

Answer

Flow of solvent from a concentrated to a dilute solution

Question 15

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

Question 16

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

Answer

Electrolytic cell

Answer

Galvanic cell

Question 17

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

Question 18

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

Question 19

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

Answer

Photo electrolysis

Answer

Cathodic protection

Answer

Electrolysis

Answer

Galvanization

Question 20

20. Chemical used in salt bridge is

Question 21

21. A redox reaction involves

Answer

A reaction in a solution

Answer

Proton transfer

Answer

Electron transfer

Answer

Ion combination reaction

Question 22

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

Answer

Manufacture of bleach

Answer

Rust removal

Answer

Making leather

Answer

Electroplating

Question 23

23. Strong reducing agents have

Answer

Lesser positive value of standard reduction potential

Answer

Greater positive value of standard reduction potential

Answer

None of these

Answer

Greater negative value of standard reduction potential

Question 24

24. 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

128 S cm² mol¯¹

Answer

176 S cm² mol¯¹

Question 25

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

Question 26

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

Answer

Standard oxidation potential

Answer

Cell voltage

Answer

Ionization potential

Answer

Standard reduction potential

Question 27

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

Question 28

28. The reference electrode is made by using

Answer

Hg₂Cl₂

Question 29

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

Answer

1.81 cm¯³

Answer

1.25 cm¯³

Answer

2.15 cm¯³

Answer

1.15 cm¯³

Question 30

30. Pick out the wrong statement. In electrochemical cell

Answer

Chemical energy is converted into electrical energy

Answer

Electrons are released at anode

Answer

Salt bridge maintains the electrical neutrality of the solution

Answer

Cathode is regarded as negative electrode

Question 31

31. 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 32

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

Answer

None of these

Answer

Electrorefining

Answer

Both A and B

Answer

Electroplating

Question 33

33. 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 34

34. Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

Answer

Na and S only

Answer

Pt and graphite only

Answer

Na, Pt and graphite

Question 35

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

Answer

Distillation

Answer

Vacuum distillation

Answer

Fractional distillation

Answer

None of these

Question 36

36. 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 37

37. The amount of electricity that can deposit 108 g of silver from silver nitrate solution is

Question 38

38. Density of H₂SO₄ in lead accumulator is

Answer

1.25g/Cm³

Answer

120 g Cm³

Answer

1.15 g/Cm³

Answer

1.2 g/Cm³

Question 39

39. What are the ions present in water?

Answer

H+ and OH-

Question 40

40. 8 g of NaOh is dissolved in 500 cm³ of solution, its molarity is:

Question 41

41. In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

Answer

Create potential difference between two electrodes

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Generate heat

Answer

Produce high purity water

Question 42

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

Answer

Electric change

Answer

Ionization potential

Answer

Standard electrode potential

Answer

Electroplating

Question 43

43. Which of the following solution of H₂SO₄ is more concentrated?

Question 44

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

Question 45

45. If the ionic product of a solution is less than the solubility product, the solution is

Answer

Unsaturated

Answer

Supersaturated

Question 46

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

Answer

Phosphorus acid

Answer

Sulphuric acid

Answer

Nitric acid

Answer

Boric acid

Question 47

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

Question 48

48. Salt bridge transfers

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. In electrolytic cell, electricity in carried out by

Answer

Neutralization

Answer

Non-spontaneous reaction

Answer

Spontaneous reaction

Question 51

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

Answer

Gold has lower reduction potential then iron

Answer

Gold is denser

Answer

Gold has higher reduction potential then iron

Answer

Iron rusts

Question 52

52. 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 53

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

Question 54

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

Answer

Na₂SO₄

Answer

CH₃ CooNH₄

Question 55

55. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 56

56. 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 57

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

Question 58

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

Question 59

59. Which of the following statements is FALSE?

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

All electrochemical reactions involve the transfer of electrons

Answer

Reduction occurs at cathode

Question 60

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

Question 61

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

Answer

Na⁺ + e– → Na

Answer

Br₂ + 2e – → 2Br –

Answer

Na → Na⁺ + e–

Answer

2Br– → Br₂ + 2e –

Question 62

62. Corrosion reactions are

Answer

Spontaneous redox reactions

Answer

Spontaneous acid–base reactions

Answer

None of these

Answer

Non-spontaneous redox reactions

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

Answer 127

None of these

Answer 128

O₂, SO₂

Answer 129

Ca(NO₃)₂

Answer 130

Electrons flow from cathode to anode through the external battery

Answer 131

Electrons flow cathode to anode within the electrolytic solution

Answer 132

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

Answer 133

None of these

Answer 134

Neutral atom

Answer 135

Does not provide any electron

Answer 136

Conduction

Answer 137

Electroplating

Answer 138

Electrolysis

Answer 139

Daniel cell

Answer 140

Electrolytic cell

Answer 141

Galvanic cell

Answer 142

22400 cm³

Answer 143

None of these

Answer 144

Both Na⁺ and CI¯

Answer 145

Raoult’s law

Answer 146

Arrhenius law

Answer 147

Ostwald’s law

Answer 148

Henry’s law

Answer 149

Cathode to anode through the external circuit

Answer 150

Anode to cathode through the solution

Answer 151

Cathode to anode through the solution

Answer 152

Anode to cathode through the external circuit

Answer 153

The degree of decomposition of solution

Answer 154

The extent of dissolution of solute

Answer 155

Degree of solubilization of solute

Answer 156

The extent of dissociation of solute

Answer 157

None of these

Answer 158

Slightly more than 1 atom

Answer 159

760 mm of Hg

Answer 160

1 – 2 α

Answer 161

Dilute solution of glucose

Answer 162

Chloroform

Answer 163

Pure distilled water

Answer 164

Molten NaCl

Answer 165

Hydrolyzed

Answer 166

Precipitated

Answer 167

From cathode to anode inside the cell

Answer 168

From cathode to anode in outer circuit

Answer 169

From anode to cathode in an outer circuit

Answer 170

From anode to cathode inside the cell

Answer 171

Increases on dilution slightly

Answer 172

Depends on density of electrolyte itself.

Answer 173

Decreases on dilution

Answer 174

Does not change on dilution

Answer 175

Daniel cell

Answer 176

Rechargeable

Answer 177

Non rechargeable

Answer 178

Electrolytic cell

Answer 179

Ionization

Answer 180

Hydrolysis

Answer 181

Weak acid and its salt of strong base

Answer 182

A strong acid and its salt of a strong base

Answer 183

Strong acid and its salt of weak base

Answer 184

Weak acid and its salt of weak base

Answer 185

1.06 x 10⁴

Answer 186

1.06 x 10³

Answer 187

1.06 x 10²

Answer 188

It is readily available

Answer 189

It is solvent for organic substances

Answer 190

It has a very high cryoscopic constant

Answer 191

It is volatile

Answer 192

– 0.35 V

Answer 193

– 1.17 V

Answer 194

Very high positive value of reduction potential

Answer 195

Reduction potentials are negative

Answer 196

Very high negative values reduction potential

Answer 197

Very low ionization potential values

Answer 198

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

Answer 199

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

Answer 200

Li is smaller in size as compared to Cu

Answer 201

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

Answer 202

Chemical energy

Answer 203

Heat energy

Answer 204

None of these

Answer 205

Electrical energy

Answer 206

∆ G = -ve

Answer 207

∆ G = +ve, ∆ E = 0

Answer 208

∆ G = 0, ∆E = 0

Answer 209

∆ G = -ve, ∆ E = 0

Answer 210

Decrease rapidly

Answer 211

Decreases slowly

Answer 212

Does not change

Answer 213

Drops to zero

Answer 214

Both are possible

Answer 215

Increase in oxidation number of all the elements on reactant side

Answer 216

Decrease in oxidation number

Answer 217

Increase in oxidation number

Answer 218

Temperature

Answer 219

Nature of the gas

Answer 220

All of these

Answer 221

Pressure of the gas

Answer 222

Increase in oxidation number of element

Answer 223

Decrease in oxidation number of element

Answer 224

Increase in oxidation number of the elements in reactants

Answer 225

Oxidation number neither increases nor decreases

Answer 226

It has not potential

Answer 227

By heating it

Answer 228

By addition of fresh solution

Answer 229

By replacing external circuit with external source of electricity

Answer 230

By removal of solution

Answer 231

Electrical energy is converted into chemical energy

Answer 232

Chemical energy is converted into electricity

Answer 233

Electrical energy is converted into heat

Answer 234

Chemical energy is converted into heat

Answer 235

760 mm of Hg

Answer 236

800 mm of Hg

Answer 237

780 mm of Hg

Answer 238

750 mm of Hg

Answer 239

Depends on the nature of the coupled electrode

Answer 240

Oxidation-reduction

Answer 241

None of these

Answer 242

None of these

Answer 243

Is almost unionized

Answer 244

Is neutral

Answer 245

Has low boiling point

Answer 246

Is readily decomposed

Answer 247

S m mol¯¹

Answer 248

S² m² mol

Answer 249

S m² mol¯¹

Answer 250

S² m² mol¯²

Answer 251

Molarity of the solvent

Answer 252

Molality of the solution

Answer 253

Molarity of the solution

Answer 254

Mole fraction of the solution

Answer 255

Distribution law

Answer 256

Henry’s law

Answer 257

Raoult’s law

Answer 258

Ostwald’s dilution law

Answer 259

0.1 M NaCl

Answer 260

0.1 M Glucose

Answer 261

0.1 M BaCl₂

Answer 262

0.1 M Sucrose

Answer 263

Hg₂Cl₂

Answer 264

[Pt(NH₃)₄Cl₃]Cl

Answer 265

[Pt(NH₃)₄Cl]Cl₃

Answer 266

[Pt(NH₃)₄Cl₂]Cl₂

Answer 267

[Pt(NH₃)₄Cl₄]

Answer 268

Both oxidation and reduction

Answer 269

Neither oxidation and reduction

Answer 270

Dilution decreases

Answer 271

Pressure increases

Answer 272

Dilution increases

Answer 273

Sufficient date not given

Answer 274

Gains electrons

Answer 275

Is hydrolysed

Answer 276

Is oxidized

Answer 277

Loses electrons

Answer 278

A chemical cell

Answer 279

A voltaic cell

Answer 280

A galvanic cell

Answer 281

An electrolytic cell

Answer 282

Not particular

Answer 283

Reduction potential

Answer 284

Redox potential

Answer 285

e.m.f of cell

Answer 286

Oxidation potential

Answer 287

None of these

Answer 288

Refractive index

Answer 289

Osmotic pressure

Answer 290

Surface tension

Answer 291

Hg is more inert than Pt

Answer 292

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

Answer 293

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

Answer 294

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

Answer 295

All of these

Answer 296

Electric circuit

Answer 297

Salt Bridge

Answer 298

No connection exists

Answer 299

H₄P₃O₇

Answer 300

More than that of H₂O

Answer 301

Equal to that of ethanol

Answer 302

Equal to that of water

Answer 303

Less than that of water

Answer 304

In metals the ions are free to more

Answer 305

They are mobile electrons in the metallic structure

Answer 306

Metals are decomposed by current

Answer 307

Metals have high resistance

Answer 308

Increases gradually

Answer 309

Does not change

Answer 310

Drops to zero

Answer 311

Increases rapidly

Answer 312

Loses electrons

Answer 313

pH is changed

Answer 314

Gains electrons

Answer 315

Acts as a catalyst

Answer 316

Sum of reduction and oxidation potentials

Answer 317

12157.48 sec

Answer 318

One gm. atomic weight

Answer 319

One gm. Equivalent weight

Answer 320

None of these

Answer 321

Electrochemical equivalent

Answer 322

1.0 x 10¹⁰

Answer 323

2.0 x 10¹¹

Answer 324

1.0 x 10²

Answer 325

4.0 x 10¹²

Answer 326

Neutralization

Answer 327

Making iron cathode

Answer 328

Putting it in saline water

Answer 329

None of these

Answer 330

Both of these

Answer 331

0.142 cm¯¹

Answer 332

1.12 cm¯¹

Answer 333

0.918 cm¯¹

Answer 334

0.66 cm¯¹

Answer 335

Melting point

Answer 336

Boiling point

Answer 337

Inversion point

Answer 338

Sublimation point

Answer 339

Gram per million

Answer 340

Parts per million

Answer 341

Milligram percent

Answer 342

Microgram percent

Answer 343

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

Answer 344

The free energy of mixing is zero

Answer 345

The entropy of mixing is zero

Answer 346

The enthalpy of mixing is zero

Answer 347

Increases with dilution

Answer 348

Remains unchanged with dilution

Answer 349

Depends on mass of electrolyte

Answer 350

Decreases with dilution

Answer 351

Solvent particles

Answer 352

B.P of water decrease

Answer 353

B.P of water remain constant

Answer 354

B.P of water increase

Answer 355

Any possibility

Answer 356

Union between two light metals and a heavy metal

Answer 357

Electrochemical phenomenon

Answer 358

Interaction

Answer 359

Altered reaction in presence of H₂O

Answer 360

Gives ions only when electricity is passed

Answer 361

Possesses ions even in solid state

Answer 362

Forms complex ions in solution

Answer 363

Gives ions only when dissolved in water

Answer 364

At cathode

Answer 365

None of these

Answer 366

Both A and B

Answer 367

Free molecules

Answer 368

Free electrons

Answer 369

Atoms of Na and Cl.

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