Chemistry Electro Chemistry Online Mcqs Test

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Question 1

1. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 2

2. 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 3

3. Temperature for standard electrode potential is

Question 4

4. Cathode provides electrons to

Answer

Does not provide any electron

Answer

Neutral atom

Question 5

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

Answer

Ionization potential

Answer

Electroplating

Answer

Electric change

Answer

Standard electrode potential

Question 6

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

Answer

Unsaturated

Answer

Supersaturated

Question 7

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

Question 8

8. 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 9

9. An aqueous solution of ethanol in water has vapour pressure

Answer

More than that of H₂O

Answer

Equal to that of water

Answer

Less than that of water

Answer

Equal to that of ethanol

Question 10

10. A cell constant is generally found by measuring the conductivity of aqueous solution of

Question 11

11. The process of electrical coating of one metal on another to protect, decorate or to have a greater resistance to corrosion is called

Answer

Electrolysis

Answer

Electroplating

Answer

Conduction

Question 12

12. The unit of specific conductivity is

Answer

Ohm¯¹ cm¯¹

Answer

Ohm cm¯²

Answer

Ohm cm¯¹

Answer

Ohm¯¹ cm

Question 13

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

Question 14

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

Question 15

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

Answer

Chloroform

Answer

Dilute solution of glucose

Answer

Pure distilled water

Answer

Molten NaCl

Question 16

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

Answer

Hg₂Cl₂

Question 17

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

Question 18

18. Density of H₂SO₄ in lead accumulator is

Question 19

19. What are the ions present in water?

Answer

H+ and OH-

Question 20

20. 96500 C of electricity liberates from CuSO₄ solution

Answer

96500 g of CU

Answer

100 g of Cu

Answer

63.5 g of Cu

Answer

31.75 g of Cu

Question 21

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

Answer

Magnetic energy

Answer

Sound energy

Answer

Heat energy

Answer

Electrical energy

Question 22

22. 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 23

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

Answer

Electrorefining

Answer

Both A and B

Answer

None of these

Answer

Electroplating

Question 24

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

Answer

Distribution law

Answer

Raoult’s law

Answer

Ostwald’s dilution law

Answer

Henry’s law

Question 25

25. Chemical used in salt bridge is

Question 26

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

Answer

Parts per million

Answer

Gram per million

Answer

Milligram percent

Answer

Microgram percent

Question 27

27. Molarity of water is

Question 28

28. 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 29

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

Answer

Generate heat

Answer

Create potential difference between two electrodes

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Produce high purity water

Question 30

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

Answer

Diffusion rate of the solute

Answer

Elevation in boiling point

Answer

Flow of solvent from a concentrated to a dilute solution

Answer

Ionic concentration

Question 31

31. Choose the best reducing agent among the following

Question 32

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

Question 33

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

Answer

Cell voltage

Answer

Standard oxidation potential

Answer

Standard reduction potential

Answer

Ionization potential

Question 34

34. 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 35

35. 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 36

36. Secondary cell is

Answer

Rechargeable

Answer

Electrolytic cell

Answer

Daniel cell

Answer

Non rechargeable

Question 37

37. During a redox reaction, an oxidizing agent

Answer

Is oxidized

Answer

Loses electrons

Answer

Is hydrolysed

Answer

Gains electrons

Question 38

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

Question 39

39. In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam

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

Answer

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

Question 40

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

Question 41

41. In a chemical reaction, oxidation process involves

Answer

Increase in oxidation number of element

Answer

Decrease in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Answer

Increase in oxidation number of the elements in reactants

Question 42

42. 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 43

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

Question 44

44. Maximum freezing point falls in

Answer

Naphthalene

Question 45

45. Corrosion reactions are

Answer

Spontaneous acid–base reactions

Answer

Spontaneous redox reactions

Answer

Non-spontaneous redox reactions

Answer

None of these

Question 46

46. In a solution of CuSO₄ how much time will be required to precipitate 2g copper by 0.5 ampere current?

Answer

12157.48 sec

Question 47

47. Decrease in oxidation number is called

Answer

All of these

Question 48

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

Question 49

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

Question 50

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

Answer

Acts as a catalyst

Answer

Loses electrons

Answer

Gains electrons

Answer

pH is changed

Question 51

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

Question 52

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

Answer

– 1.17 V

Answer

– 0.35 V

Question 53

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

Answer

Surface tension

Answer

Refractive index

Answer

Osmotic pressure

Question 54

54. In a Galvanic cell, the electrons flow from

Answer

Cathode to anode through the solution

Answer

Cathode to anode through the external circuit

Answer

Anode to cathode through the solution

Answer

Anode to cathode through the external circuit

Question 55

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

Answer

Rust removal

Answer

Electroplating

Answer

Making leather

Answer

Manufacture of bleach

Question 56

56. Under the process of rusting of iron, 4Fe + 3O₂ → 2Fe₂O₃, iron is

Answer

Hydrolyzed

Answer

Precipitated

Question 57

57. 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 58

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

Question 59

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

Question 60

60. The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm¯¹ cm¯¹. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

Answer

1.12 cm¯¹

Answer

0.66 cm¯¹

Answer

0.142 cm¯¹

Answer

0.918 cm¯¹

Question 61

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

Answer

H₄P₃O₇

Question 62

62. 18g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to

Question 63

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

Answer

Galvanic cell

Answer

Electrolytic cell

Question 64

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

Answer 116

Metals have high resistance

Answer 117

In metals the ions are free to more

Answer 118

Metals are decomposed by current

Answer 119

They are mobile electrons in the metallic structure

Answer 120

None of these

Answer 121

Greater positive value of standard reduction potential

Answer 122

Greater negative value of standard reduction potential

Answer 123

Lesser positive value of standard reduction potential

Answer 124

Both oxidation and reduction

Answer 125

Neither oxidation and reduction

Answer 126

2Br– → Br₂ + 2e –

Answer 127

Na⁺ + e– → Na

Answer 128

Na → Na⁺ + e–

Answer 129

Br₂ + 2e – → 2Br –

Answer 130

Equal to the total volume of the components

Answer 131

None of these

Answer 132

Slightly less than the total volume of the components

Answer 133

Slightly more than the total volume of the components

Answer 134

Neutralization

Answer 135

Cathode is regarded as negative electrode

Answer 136

Chemical energy is converted into electrical energy

Answer 137

Salt bridge maintains the electrical neutrality of the solution

Answer 138

Electrons are released at anode

Answer 139

Hg₂Cl₂

Answer 140

The entropy of mixing is zero

Answer 141

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

Answer 142

The enthalpy of mixing is zero

Answer 143

The free energy of mixing is zero

Answer 144

Dilution increases

Answer 145

Dilution decreases

Answer 146

Pressure increases

Answer 147

Both a and b

Answer 148

Dilute solution which behave as nearly ideal solution

Answer 149

Neither a nor b

Answer 150

Concentration solutions behave as nearly non – ideal solutions

Answer 151

Daniel cell

Answer 152

Galvanic cell

Answer 153

Electrolytic cell

Answer 154

The extent of dissolution of solute

Answer 155

The extent of dissociation of solute

Answer 156

The degree of decomposition of solution

Answer 157

Degree of solubilization of solute

Answer 158

Both of these

Answer 159

Making iron cathode

Answer 160

None of these

Answer 161

Putting it in saline water

Answer 162

B.P of water increase

Answer 163

B.P of water decrease

Answer 164

Any possibility

Answer 165

B.P of water remain constant

Answer 166

Drops to zero

Answer 167

Decrease rapidly

Answer 168

Does not change

Answer 169

Decreases slowly

Answer 170

Does not change on dilution

Answer 171

Depends on density of electrolyte itself.

Answer 172

Increases on dilution slightly

Answer 173

Decreases on dilution

Answer 174

Solvent particles

Answer 175

Vacuum distillation

Answer 176

None of these

Answer 177

Fractional distillation

Answer 178

Distillation

Answer 179

Atoms of Na and Cl.

Answer 180

Free molecules

Answer 181

Free electrons

Answer 182

One gm. atomic weight

Answer 183

One gm. Equivalent weight

Answer 184

None of these

Answer 185

Electrochemical equivalent

Answer 186

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

Answer 187

All electrochemical reactions involve the transfer of electrons

Answer 188

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

Answer 189

Reduction occurs at cathode

Answer 190

0.1 N NaCl

Answer 191

At cathode

Answer 192

None of these

Answer 193

Both A and B

Answer 194

A voltaic cell

Answer 195

A chemical cell

Answer 196

An electrolytic cell

Answer 197

A galvanic cell

Answer 198

Heat energy

Answer 199

Chemical energy

Answer 200

None of these

Answer 201

Electrical energy

Answer 202

Gold has lower reduction potential then iron

Answer 203

Gold is denser

Answer 204

Iron rusts

Answer 205

Gold has higher reduction potential then iron

Answer 206

0.1 M Glucose

Answer 207

0.1 M NaCl

Answer 208

0.1 M BaCl₂

Answer 209

0.1 M Sucrose

Answer 210

None of these

Answer 211

1.2 g/Cm³

Answer 212

1.15 g/Cm³

Answer 213

1.25g/Cm³

Answer 214

120 g Cm³

Answer 215

Thomas Gradam

Answer 216

1.06 x 10³

Answer 217

1.06 x 10⁴

Answer 218

1.06 x 10²

Answer 219

It has a very high cryoscopic constant

Answer 220

It is solvent for organic substances

Answer 221

It is volatile

Answer 222

It is readily available

Answer 223

None of these

Answer 224

Both Na⁺ and CI¯

Answer 225

Melting point

Answer 226

Boiling point

Answer 227

Inversion point

Answer 228

Sublimation point

Answer 229

2.15 cm¯³

Answer 230

1.81 cm¯³

Answer 231

1.25 cm¯³

Answer 232

1.15 cm¯³

Answer 233

Hypertonic

Answer 234

None of these

Answer 235

O₂, SO₂

Answer 236

10.0g NaCl/100ml

Answer 237

20g NaCl/100ml

Answer 238

5.58g NaCl/100m

Answer 239

58.5g NaCl/100ml

Answer 240

Sufficient date not given

Answer 241

Increase in oxidation number

Answer 242

Both are possible

Answer 243

Increase in oxidation number of all the elements on reactant side

Answer 244

Decrease in oxidation number

Answer 245

Does not change

Answer 246

Increases gradually

Answer 247

Increases rapidly

Answer 248

Drops to zero

Answer 249

Electrons flow from cathode to anode through the external battery

Answer 250

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

Answer 251

None of these

Answer 252

Electrons flow cathode to anode within the electrolytic solution

Answer 253

1 – 2 α

Answer 254

Proton transfer

Answer 255

A reaction in a solution

Answer 256

Ion combination reaction

Answer 257

Electron transfer

Answer 258

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 259

Boiling point of pure water decreases by the addition of ethanol

Answer 260

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

Answer 261

Boiling point of pure benzene increases by the addition of toluene

Answer 262

From anode to cathode inside the cell

Answer 263

From cathode to anode in outer circuit

Answer 264

From anode to cathode in an outer circuit

Answer 265

From cathode to anode inside the cell

Answer 266

Slightly less than one

Answer 267

Exactly equal to one

Answer 268

None of these

Answer 269

Slightly greater than one

Answer 270

800 mm of Hg

Answer 271

750 mm of Hg

Answer 272

780 mm of Hg

Answer 273

760 mm of Hg

Answer 274

Increases with dilution

Answer 275

Depends on mass of electrolyte

Answer 276

Decreases with dilution

Answer 277

Remains unchanged with dilution

Answer 278

None of these

Answer 279

Temperature

Answer 280

Nature of the gas

Answer 281

Pressure of the gas

Answer 282

All of these

Answer 283

Very low ionization potential values

Answer 284

Very high positive value of reduction potential

Answer 285

Reduction potentials are negative

Answer 286

Very high negative values reduction potential

Answer 287

Is readily decomposed

Answer 288

Is almost unionized

Answer 289

Is neutral

Answer 290

Has low boiling point

Answer 291

Salt Bridge

Answer 292

No connection exists

Answer 293

Electric circuit

Answer 294

Weak acid and its salt of weak base

Answer 295

A strong acid and its salt of a strong base

Answer 296

Weak acid and its salt of strong base

Answer 297

Strong acid and its salt of weak base

Answer 298

Li is smaller in size as compared to Cu

Answer 299

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

Answer 300

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

Answer 301

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

Answer 302

∆ G = 0, ∆E = 0

Answer 303

∆ G = -ve

Answer 304

∆ G = +ve, ∆ E = 0

Answer 305

∆ G = -ve, ∆ E = 0

Answer 306

760 mm of Hg

Answer 307

Slightly more than 1 atom

Answer 308

It has not potential

Answer 309

Oxidation-reduction

Answer 310

Depends on the nature of the coupled electrode

Answer 311

Molarity of the solution

Answer 312

Molarity of the solvent

Answer 313

Molality of the solution

Answer 314

Mole fraction of the solution

Answer 315

302 S cm² mol¯¹

Answer 316

176 S cm² mol¯¹

Answer 317

128 S cm² mol¯¹

Answer 318

278 S cm² mol¯¹

Answer 319

Ionization

Answer 320

Hydrolysis

Answer 321

Not particular

Answer 322

Neutralization

Answer 323

Non-spontaneous reaction

Answer 324

Spontaneous reaction

Answer 325

Photo electrolysis

Answer 326

Galvanization

Answer 327

Cathodic protection

Answer 328

Electrolysis

Answer 329

CH₃ CooNH₄

Answer 330

Na₂SO₄

Answer 331

None of these

Answer 332

By heating it

Answer 333

By addition of fresh solution

Answer 334

By removal of solution

Answer 335

By replacing external circuit with external source of electricity

Answer 336

Oxidation potential

Answer 337

e.m.f of cell

Answer 338

Reduction potential

Answer 339

Redox potential

Answer 340

Raoult’s law

Answer 341

Arrhenius law

Answer 342

Henry’s law

Answer 343

Ostwald’s law

Answer 344

Pt and graphite only

Answer 345

Na and S only

Answer 346

Na, Pt and graphite

Answer 347

Chemical energy is converted into electricity

Answer 348

Electrical energy is converted into heat

Answer 349

Electrical energy is converted into chemical energy

Answer 350

Chemical energy is converted into heat

Answer 351

None of these

Answer 352

Sum of reduction and oxidation potentials

Answer 353

Sulphuric acid

Answer 354

Boric acid

Answer 355

Phosphorus acid

Answer 356

Nitric acid

Answer 357

Ca(NO₃)₂

Answer 358

[Pt(NH₃)₄Cl₃]Cl

Answer 359

[Pt(NH₃)₄Cl]Cl₃

Answer 360

[Pt(NH₃)₄Cl₂]Cl₂

Answer 361

[Pt(NH₃)₄Cl₄]

Answer 362

1.0 x 10²

Answer 363

1.0 x 10¹⁰

Answer 364

4.0 x 10¹²

Answer 365

2.0 x 10¹¹

Answer 366

S² m² mol¯²

Answer 367

S² m² mol

Answer 368

S m mol¯¹

Answer 369

S m² mol¯¹

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Total Marks:	192
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