Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is

Question 2

2. 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 3

3. Reduction always occurs

Answer

At cathode

Answer

Both A and B

Answer

None of these

Question 4

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

Answer

None of these

Question 5

5. 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 6

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

Question 7

7. A 0.001 molal solution of [Pt(NH₃)₄Cl₄] in water had a freezing point depression of 0.0054°C. If Kf for water is 1.80, the correct formulation for the above molecule is

Answer

[Pt(NH₃)₄Cl₃]Cl

Answer

[Pt(NH₃)₄Cl₂]Cl₂

Answer

[Pt(NH₃)₄Cl₄]

Answer

[Pt(NH₃)₄Cl]Cl₃

Question 8

8. The unit of specific conductivity is

Answer

Ohm cm¯¹

Answer

Ohm¯¹ cm¯¹

Answer

Ohm¯¹ cm

Answer

Ohm cm¯²

Question 9

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

Answer

10.0g NaCl/100ml

Answer

20g NaCl/100ml

Answer

58.5g NaCl/100ml

Answer

5.58g NaCl/100m

Question 10

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

Answer

278 S cm² mol¯¹

Answer

176 S cm² mol¯¹

Answer

302 S cm² mol¯¹

Answer

128 S cm² mol¯¹

Question 11

11. Oxidation state of hydrogen in CaH₂ is

Question 12

12. 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 13

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

Question 14

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

Answer

Osmotic pressure

Answer

Refractive index

Answer

Surface tension

Question 15

15. The best reducing agent is

Question 16

16. Solution with same osmotic pressures are called

Answer

Hypertonic

Question 17

17. 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 10⁴

Answer

1.06 x 10³

Question 18

18. An electric current is passed through silver nitrate solution using silver electrodes. 10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is

Question 19

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

Answer

– 0.35 V

Answer

– 1.17 V

Question 20

20. In a Galvanic cell

Answer

Chemical energy is converted into heat

Answer

Electrical energy is converted into heat

Answer

Electrical energy is converted into chemical energy

Answer

Chemical energy is converted into electricity

Question 21

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

Answer

Increases rapidly

Answer

Drops to zero

Answer

Does not change

Answer

Increases gradually

Question 22

22. Chemical used in salt bridge is

Question 23

23. Voltaic cell can be recharged by

Answer

By heating it

Answer

By removal of solution

Answer

By addition of fresh solution

Answer

By replacing external circuit with external source of electricity

Question 24

24. The conductivity of strong electrolyte

Answer

Increases on dilution slightly

Answer

Depends on density of electrolyte itself.

Answer

Decreases on dilution

Answer

Does not change on dilution

Question 25

25. 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 26

26. Density of H₂SO₄ in lead accumulator is

Question 27

27. 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 28

28. Electrode potential of Zn is

Answer

Depends on the nature of the coupled electrode

Answer

Oxidation-reduction

Question 29

29. An electrolyte

Answer

Gives ions only when electricity is passed

Answer

Forms complex ions in solution

Answer

Possesses ions even in solid state

Answer

Gives ions only when dissolved in water

Question 30

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

Answer

Milligram percent

Answer

Parts per million

Answer

Gram per million

Answer

Microgram percent

Question 31

31. 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 32

32. 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 33

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

Answer

Boiling point of pure water decreases by the addition of ethanol

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

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

Question 34

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

Answer

Both Na⁺ and CI¯

Answer

None of these

Question 35

35. 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

Electrolysis

Answer

Electroplating

Question 36

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

Question 37

37. Reaction takes place at anode is

Answer

Hydrolysis

Answer

Ionization

Question 38

38. In electrolytic cell, electricity in carried out by

Answer

Non-spontaneous reaction

Answer

Spontaneous reaction

Answer

Neutralization

Question 39

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

Answer

Chemical energy

Answer

Heat energy

Answer

None of these

Answer

Electrical energy

Question 40

40. In alkaline battery anode is made up of

Question 41

41. Potential of Zn is called

Answer

It has not potential

Question 42

42. 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 43

43. 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 m² mol¯¹

Answer

S m mol¯¹

Answer

S² m² mol

Answer

S² m² mol¯²

Question 44

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

Question 45

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

Answer

Ostwald’s dilution law

Answer

Distribution law

Answer

Raoult’s law

Answer

Henry’s law

Question 46

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

Answer

Manufacture of bleach

Answer

Electroplating

Answer

Making leather

Answer

Rust removal

Question 47

47. Decrease in oxidation number is called

Answer

All of these

Question 48

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

Question 49

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

Answer

Sulphuric acid

Answer

Boric acid

Answer

Phosphorus acid

Answer

Nitric acid

Question 50

50. 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 51

51. 0.5 M of H₂SO₄ is diluted from 1 liter to 10 liter, normality of resulting solution is

Question 52

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

Question 53

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

Answer

Standard electrode potential

Answer

Ionization potential

Answer

Electric change

Answer

Electroplating

Question 54

54. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 55

55. When Cu, Ag, Au and Pt are reacted with acids, these metals do not liberate hydrogen, this is due to the reason that

Answer

Reduction potentials are negative

Answer

Very high positive value of reduction potential

Answer

Very low ionization potential values

Answer

Very high negative values reduction potential

Question 56

56. Half cells are interconnected through

Answer

Electric circuit

Answer

No connection exists

Answer

Salt Bridge

Question 57

57. The relative lowering of vapour pressure is equal to mole fraction of the solute. This law is called:

Answer

Henry’s law

Answer

Raoult’s law

Answer

Arrhenius law

Answer

Ostwald’s law

Question 58

58. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 59

59. 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

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

Answer

All electrochemical reactions involve the transfer of electrons

Question 60

60. 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 61

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

Question 62

62. The temperature at which the vapour pressure of a liquid becomes equal to external pressure is

Answer

Inversion point

Answer

Boiling point

Answer

Melting point

Answer

Sublimation point

Question 63

63. 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 64

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

Answer 127

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

Answer 128

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

Answer 129

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

Answer 130

Hg is more inert than Pt

Answer 131

0.1 M Sucrose

Answer 132

0.1 M BaCl₂

Answer 133

0.1 M NaCl

Answer 134

0.1 M Glucose

Answer 135

Decreases slowly

Answer 136

Does not change

Answer 137

Drops to zero

Answer 138

Decrease rapidly

Answer 139

Exactly equal to one

Answer 140

None of these

Answer 141

Slightly greater than one

Answer 142

Slightly less than one

Answer 143

Electroplating

Answer 144

None of these

Answer 145

Electrorefining

Answer 146

Both A and B

Answer 147

780 mm of Hg

Answer 148

760 mm of Hg

Answer 149

800 mm of Hg

Answer 150

750 mm of Hg

Answer 151

Is almost unionized

Answer 152

Is readily decomposed

Answer 153

Is neutral

Answer 154

Has low boiling point

Answer 155

None of these

Answer 156

Non-spontaneous redox reactions

Answer 157

Spontaneous redox reactions

Answer 158

Spontaneous acid–base reactions

Answer 159

Sum of reduction and oxidation potentials

Answer 160

Fractional distillation

Answer 161

Vacuum distillation

Answer 162

None of these

Answer 163

Distillation

Answer 164

Degree of solubilization of solute

Answer 165

The degree of decomposition of solution

Answer 166

The extent of dissociation of solute

Answer 167

The extent of dissolution of solute

Answer 168

0.142 cm¯¹

Answer 169

0.918 cm¯¹

Answer 170

0.66 cm¯¹

Answer 171

1.12 cm¯¹

Answer 172

None of these

Answer 173

Electrolytic cell

Answer 174

Galvanic cell

Answer 175

Standard reduction potential

Answer 176

Standard oxidation potential

Answer 177

Ionization potential

Answer 178

Cell voltage

Answer 179

Thomas Gradam

Answer 180

2.0 x 10¹¹

Answer 181

1.0 x 10²

Answer 182

4.0 x 10¹²

Answer 183

1.0 x 10¹⁰

Answer 184

Electrolytic cell

Answer 185

Rechargeable

Answer 186

Non rechargeable

Answer 187

Daniel cell

Answer 188

None of these

Answer 189

Free molecules

Answer 190

Atoms of Na and Cl.

Answer 191

Free electrons

Answer 192

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

Answer 193

The enthalpy of mixing is zero

Answer 194

The entropy of mixing is zero

Answer 195

The free energy of mixing is zero

Answer 196

Supersaturated

Answer 197

Unsaturated

Answer 198

Any possibility

Answer 199

B.P of water remain constant

Answer 200

B.P of water decrease

Answer 201

B.P of water increase

Answer 202

Pt and graphite only

Answer 203

Na, Pt and graphite

Answer 204

Na and S only

Answer 205

H₄P₃O₇

Answer 206

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

Answer 207

Electrons flow from cathode to anode through the external battery

Answer 208

None of these

Answer 209

Electrons flow cathode to anode within the electrolytic solution

Answer 210

Salt bridge maintains the electrical neutrality of the solution

Answer 211

Electrons are released at anode

Answer 212

Cathode is regarded as negative electrode

Answer 213

Chemical energy is converted into electrical energy

Answer 214

Neutral atom

Answer 215

Does not provide any electron

Answer 216

One gm. Equivalent weight

Answer 217

None of these

Answer 218

One gm. atomic weight

Answer 219

Electrochemical equivalent

Answer 220

Diffusion rate of the solute

Answer 221

Elevation in boiling point

Answer 222

Ionic concentration

Answer 223

Flow of solvent from a concentrated to a dilute solution

Answer 224

Molarity of the solution

Answer 225

Molality of the solution

Answer 226

Molarity of the solvent

Answer 227

Mole fraction of the solution

Answer 228

Slightly more than 1 atom

Answer 229

760 mm of Hg

Answer 230

Ion combination reaction

Answer 231

Electron transfer

Answer 232

Proton transfer

Answer 233

A reaction in a solution

Answer 234

Naphthalene

Answer 235

Photo electrolysis

Answer 236

Cathodic protection

Answer 237

Galvanization

Answer 238

Electrolysis

Answer 239

Na₂SO₄

Answer 240

CH₃ CooNH₄

Answer 241

Sound energy

Answer 242

Electrical energy

Answer 243

Heat energy

Answer 244

Magnetic energy

Answer 245

Is hydrolysed

Answer 246

Gains electrons

Answer 247

Is oxidized

Answer 248

Loses electrons

Answer 249

Both of these

Answer 250

Putting it in saline water

Answer 251

Making iron cathode

Answer 252

None of these

Answer 253

Sufficient date not given

Answer 254

H+ and OH-

Answer 255

Increase in oxidation number

Answer 256

Decrease in oxidation number

Answer 257

Increase in oxidation number of all the elements on reactant side

Answer 258

Both are possible

Answer 259

Less than that of water

Answer 260

More than that of H₂O

Answer 261

Equal to that of ethanol

Answer 262

Equal to that of water

Answer 263

22400 cm³

Answer 264

0.1 N NaCl

Answer 265

Neutralization

Answer 266

31.75 g of Cu

Answer 267

96500 g of CU

Answer 268

63.5 g of Cu

Answer 269

100 g of Cu

Answer 270

Increases with dilution

Answer 271

Decreases with dilution

Answer 272

Remains unchanged with dilution

Answer 273

Depends on mass of electrolyte

Answer 274

Gold has lower reduction potential then iron

Answer 275

Gold is denser

Answer 276

Iron rusts

Answer 277

Gold has higher reduction potential then iron

Answer 278

12157.48 sec

Answer 279

It is volatile

Answer 280

It is solvent for organic substances

Answer 281

It has a very high cryoscopic constant

Answer 282

It is readily available

Answer 283

Ca(NO₃)₂

Answer 284

Acts as a catalyst

Answer 285

Loses electrons

Answer 286

pH is changed

Answer 287

Gains electrons

Answer 288

Oxidation potential

Answer 289

Redox potential

Answer 290

e.m.f of cell

Answer 291

Reduction potential

Answer 292

A voltaic cell

Answer 293

An electrolytic cell

Answer 294

A galvanic cell

Answer 295

A chemical cell

Answer 296

Anode to cathode through the solution

Answer 297

Cathode to anode through the solution

Answer 298

Anode to cathode through the external circuit

Answer 299

Cathode to anode through the external circuit

Answer 300

Union between two light metals and a heavy metal

Answer 301

Altered reaction in presence of H₂O

Answer 302

Interaction

Answer 303

Electrochemical phenomenon

Answer 304

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

Answer 305

Li is smaller in size as compared to Cu

Answer 306

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

Answer 307

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

Answer 308

1.15 cm¯³

Answer 309

1.81 cm¯³

Answer 310

1.25 cm¯³

Answer 311

2.15 cm¯³

Answer 312

Metals have high resistance

Answer 313

Metals are decomposed by current

Answer 314

In metals the ions are free to more

Answer 315

They are mobile electrons in the metallic structure

Answer 316

Slightly less than the total volume of the components

Answer 317

None of these

Answer 318

Equal to the total volume of the components

Answer 319

Slightly more than the total volume of the components

Answer 320

Chloroform

Answer 321

Molten NaCl

Answer 322

Pure distilled water

Answer 323

Dilute solution of glucose

Answer 324

∆ G = -ve

Answer 325

∆ G = -ve, ∆ E = 0

Answer 326

∆ G = 0, ∆E = 0

Answer 327

∆ G = +ve, ∆ E = 0

Answer 328

Solvent particles

Answer 329

Electrolytic cell

Answer 330

Galvanic cell

Answer 331

Daniel cell

Answer 332

Hydrolyzed

Answer 333

Precipitated

Answer 334

Not particular

Answer 335

Generate heat

Answer 336

Produce high purity water

Answer 337

Create potential difference between two electrodes

Answer 338

Remove adsorbed oxygen from electrode surfaces

Answer 339

Both a and b

Answer 340

Neither a nor b

Answer 341

Dilute solution which behave as nearly ideal solution

Answer 342

Concentration solutions behave as nearly non – ideal solutions

Answer 343

Strong acid and its salt of weak base

Answer 344

Weak acid and its salt of strong base

Answer 345

Weak acid and its salt of weak base

Answer 346

A strong acid and its salt of a strong base

Answer 347

120 g Cm³

Answer 348

1.2 g/Cm³

Answer 349

1.25g/Cm³

Answer 350

1.15 g/Cm³

Answer 351

Hg₂Cl₂

Answer 352

Br₂ + 2e – → 2Br –

Answer 353

2Br– → Br₂ + 2e –

Answer 354

Na → Na⁺ + e–

Answer 355

Na⁺ + e– → Na

Answer 356

Greater positive value of standard reduction potential

Answer 357

None of these

Answer 358

Lesser positive value of standard reduction potential

Answer 359

Greater negative value of standard reduction potential

Answer 360

Pressure increases

Answer 361

Dilution increases

Answer 362

Dilution decreases

Answer 363

Hg₂Cl₂

Answer 364

Increase in oxidation number of the elements in reactants

Answer 365

Decrease in oxidation number of element

Answer 366

Increase in oxidation number of element

Answer 367

Oxidation number neither increases nor decreases

Answer 368

Neither oxidation and reduction

Answer 369

Both oxidation and reduction

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