Chemistry Electro Chemistry Online Mcqs Test

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Question 1

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

Question 2

2. 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 3

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

Question 4

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

Answer

Hydrolyzed

Answer

Precipitated

Question 5

5. Density of H₂SO₄ in lead accumulator is

Question 6

6. 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 7

7. 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 cathode to anode inside the cell

Answer

From anode to cathode inside the cell

Question 8

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

Question 9

9. 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 10

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

Question 11

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

Question 12

12. Oxidation number of carbon in NaHCO₃ is

Question 13

13. Which of the following statements is FALSE?

Answer

All electrochemical reactions involve the transfer of electrons

Answer

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

Answer

Reduction occurs at cathode

Answer

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

Question 14

14. 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 15

15. Which substances are mixed to form a buffer solution?

Answer

Weak acid and its salt of weak base

Answer

Weak acid and its salt of strong base

Answer

A strong acid and its salt of a strong base

Answer

Strong acid and its salt of weak base

Question 16

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

Answer

Hg₂Cl₂

Question 17

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

Answer

Supersaturated

Answer

Unsaturated

Question 18

18. 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 19

19. 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 20

20. Standard hydrogen electrode has an arbitrarily fixed potential

Answer

None of these

Question 21

21. Choose the cell among the following list in which conversation of electrical energy into chemical energy takes place

Answer

Electrolytic cell

Answer

Galvanic cell

Answer

Daniel cell

Question 22

22. What are the ions present in water?

Answer

H+ and OH-

Question 23

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

Answer

Pt and graphite only

Answer

Na, Pt and graphite

Answer

Na and S only

Question 24

24. Li occupies higher position in the electrochemical series of metals as compared to Cu since

Answer

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

Answer

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

Answer

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

Answer

Li is smaller in size as compared to Cu

Question 25

25. 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 26

26. 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 27

27. Oxidation in a chemical reaction involves

Answer

Increase in oxidation number of all the elements on reactant side

Answer

Decrease in oxidation number

Answer

Both are possible

Answer

Increase in oxidation number

Question 28

28. Oxidation state of hydrogen in CaH₂ is

Question 29

29. 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 30

30. The art of electroplating was given by

Answer

Thomas Gradam

Question 31

31. 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 32

32. Metals usually conduct electricity because

Answer

Metals have high resistance

Answer

Metals are decomposed by current

Answer

In metals the ions are free to more

Answer

They are mobile electrons in the metallic structure

Question 33

33. Time required to deposit one millimole of aluminum metal by the passage of 9.65 amperes through molten electrolyte containing aluminum ion is

Question 34

34. Colligative properties are the properties of

Answer

Concentration solutions behave as nearly non – ideal solutions

Answer

Neither a nor b

Answer

Dilute solution which behave as nearly ideal solution

Answer

Both a and b

Question 35

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

Answer

Produce high purity water

Answer

Remove adsorbed oxygen from electrode surfaces

Answer

Create potential difference between two electrodes

Answer

Generate heat

Question 36

36. An electrolyte

Answer

Possesses ions even in solid state

Answer

Forms complex ions in solution

Answer

Gives ions only when electricity is passed

Answer

Gives ions only when dissolved in water

Question 37

37. In a chemical reaction, oxidation process involves

Answer

Increase in oxidation number of the elements in reactants

Answer

Decrease in oxidation number of element

Answer

Increase in oxidation number of element

Answer

Oxidation number neither increases nor decreases

Question 38

38. Strong reducing agents have

Answer

Lesser positive value of standard reduction potential

Answer

Greater negative value of standard reduction potential

Answer

Greater positive value of standard reduction potential

Answer

None of these

Question 39

39. 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 40

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

Question 41

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

Question 42

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

Question 43

43. Salt bridge transfers

Question 44

44. Reduction always occurs

Answer

None of these

Answer

Both A and B

Answer

At cathode

Question 45

45. Stronger the oxidizing agent, greater is the

Answer

Reduction potential

Answer

e.m.f of cell

Answer

Redox potential

Answer

Oxidation potential

Question 46

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

Answer

Electrolysis

Answer

Galvanization

Answer

Cathodic protection

Answer

Photo electrolysis

Question 47

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

Answer

CH₃ CooNH₄

Answer

Na₂SO₄

Question 48

48. When common salt is dissolved in water

Answer

B.P of water increase

Answer

B.P of water decrease

Answer

B.P of water remain constant

Answer

Any possibility

Question 49

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

Answer

Rust removal

Answer

Manufacture of bleach

Answer

Making leather

Answer

Electroplating

Question 50

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

Answer

Gold has higher reduction potential then iron

Answer

Gold is denser

Answer

Gold has lower reduction potential then iron

Answer

Iron rusts

Question 51

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

Question 52

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

Answer

Cell voltage

Answer

Standard reduction potential

Answer

Standard oxidation potential

Answer

Ionization potential

Question 53

53. 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 54

54. 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

Conduction

Answer

Electroplating

Question 55

55. If the salt bridge is not used between two half cells, then the voltage

Answer

Decrease rapidly

Answer

Drops to zero

Answer

Decreases slowly

Answer

Does not change

Question 56

56. Voltaic cell can be recharged by

Answer

By removal of solution

Answer

By addition of fresh solution

Answer

By heating it

Answer

By replacing external circuit with external source of electricity

Question 57

57. 96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Question 58

58. If liquids A and B form an ideal solution

Answer

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

Answer

The enthalpy of mixing is zero

Answer

The entropy of mixing is zero

Answer

The free energy of mixing is zero

Question 59

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

Question 60

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

Question 61

61. Molarity of water is

Question 62

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

Answer

Br₂ + 2e – → 2Br –

Answer

2Br– → Br₂ + 2e –

Answer

Na → Na⁺ + e–

Answer

Na⁺ + e– → Na

Question 63

63. 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 64

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

Answer

Both A and B

Answer

Electroplating

Answer

None of these

Answer

Electrorefining

Answer 126

1.15 cm¯³

Answer 127

1.25 cm¯³

Answer 128

1.81 cm¯³

Answer 129

2.15 cm¯³

Answer 130

None of these

Answer 131

Fractional distillation

Answer 132

Distillation

Answer 133

Vacuum distillation

Answer 134

None of these

Answer 135

Hypertonic

Answer 136

Is neutral

Answer 137

Is readily decomposed

Answer 138

Has low boiling point

Answer 139

Is almost unionized

Answer 140

Naphthalene

Answer 141

Spontaneous reaction

Answer 142

Non-spontaneous reaction

Answer 143

Neutralization

Answer 144

It has a very high cryoscopic constant

Answer 145

It is solvent for organic substances

Answer 146

It is readily available

Answer 147

It is volatile

Answer 148

Sum of reduction and oxidation potentials

Answer 149

Ionic concentration

Answer 150

Flow of solvent from a concentrated to a dilute solution

Answer 151

Elevation in boiling point

Answer 152

Diffusion rate of the solute

Answer 153

1.15 g/Cm³

Answer 154

120 g Cm³

Answer 155

1.25g/Cm³

Answer 156

1.2 g/Cm³

Answer 157

Sufficient date not given

Answer 158

780 mm of Hg

Answer 159

800 mm of Hg

Answer 160

760 mm of Hg

Answer 161

750 mm of Hg

Answer 162

Electrolytic cell

Answer 163

Galvanic cell

Answer 164

S m mol¯¹

Answer 165

S² m² mol¯²

Answer 166

S² m² mol

Answer 167

S m² mol¯¹

Answer 168

Neither oxidation and reduction

Answer 169

Both oxidation and reduction

Answer 170

Slightly more than the total volume of the components

Answer 171

None of these

Answer 172

Equal to the total volume of the components

Answer 173

Slightly less than the total volume of the components

Answer 174

Ionization potential

Answer 175

Electric change

Answer 176

Electroplating

Answer 177

Standard electrode potential

Answer 178

22400 cm³

Answer 179

96500 g of CU

Answer 180

63.5 g of Cu

Answer 181

31.75 g of Cu

Answer 182

100 g of Cu

Answer 183

Free molecules

Answer 184

Atoms of Na and Cl.

Answer 185

Free electrons

Answer 186

Henry’s law

Answer 187

Ostwald’s dilution law

Answer 188

Distribution law

Answer 189

Raoult’s law

Answer 190

Very high positive value of reduction potential

Answer 191

Very high negative values reduction potential

Answer 192

Reduction potentials are negative

Answer 193

Very low ionization potential values

Answer 194

The degree of decomposition of solution

Answer 195

The extent of dissolution of solute

Answer 196

Degree of solubilization of solute

Answer 197

The extent of dissociation of solute

Answer 198

0.1 N NaCl

Answer 199

Electric circuit

Answer 200

Salt Bridge

Answer 201

No connection exists

Answer 202

More than that of H₂O

Answer 203

Equal to that of water

Answer 204

Less than that of water

Answer 205

Equal to that of ethanol

Answer 206

Surface tension

Answer 207

Refractive index

Answer 208

Osmotic pressure

Answer 209

None of these

Answer 210

Slightly greater than one

Answer 211

Slightly less than one

Answer 212

Exactly equal to one

Answer 213

Neutral atom

Answer 214

Does not provide any electron

Answer 215

Does not change

Answer 216

Increases gradually

Answer 217

Increases rapidly

Answer 218

Drops to zero

Answer 219

Spontaneous acid–base reactions

Answer 220

Spontaneous redox reactions

Answer 221

None of these

Answer 222

Non-spontaneous redox reactions

Answer 223

None of these

Answer 224

Both Na⁺ and CI¯

Answer 225

One gm. Equivalent weight

Answer 226

One gm. atomic weight

Answer 227

Electrochemical equivalent

Answer 228

None of these

Answer 229

An electrolytic cell

Answer 230

A chemical cell

Answer 231

A galvanic cell

Answer 232

A voltaic cell

Answer 233

Electrical energy

Answer 234

Chemical energy

Answer 235

Heat energy

Answer 236

None of these

Answer 237

Ionization

Answer 238

Hydrolysis

Answer 239

None of these

Answer 240

H₄P₃O₇

Answer 241

∆ G = -ve

Answer 242

∆ G = 0, ∆E = 0

Answer 243

∆ G = -ve, ∆ E = 0

Answer 244

∆ G = +ve, ∆ E = 0

Answer 245

Boiling point of pure water decreases by the addition of ethanol

Answer 246

Vapour pressure of pure benzene decreases by the addition of naphthalene

Answer 247

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

Answer 248

Boiling point of pure benzene increases by the addition of toluene

Answer 249

Both of these

Answer 250

None of these

Answer 251

Making iron cathode

Answer 252

Putting it in saline water

Answer 253

Molten NaCl

Answer 254

Pure distilled water

Answer 255

Dilute solution of glucose

Answer 256

Chloroform

Answer 257

Molarity of the solution

Answer 258

Molarity of the solvent

Answer 259

Molality of the solution

Answer 260

Mole fraction of the solution

Answer 261

Parts per million

Answer 262

Gram per million

Answer 263

Microgram percent

Answer 264

Milligram percent

Answer 265

Depends on the nature of the coupled electrode

Answer 266

Oxidation-reduction

Answer 267

1.06 x 10³

Answer 268

1.06 x 10⁴

Answer 269

1.06 x 10²

Answer 270

[Pt(NH₃)₄Cl₃]Cl

Answer 271

[Pt(NH₃)₄Cl]Cl₃

Answer 272

[Pt(NH₃)₄Cl₄]

Answer 273

[Pt(NH₃)₄Cl₂]Cl₂

Answer 274

All of these

Answer 275

Ohm cm¯¹

Answer 276

Ohm¯¹ cm¯¹

Answer 277

Ohm cm¯²

Answer 278

Ohm¯¹ cm

Answer 279

1 – 2 α

Answer 280

2.0 x 10¹¹

Answer 281

4.0 x 10¹²

Answer 282

1.0 x 10²

Answer 283

1.0 x 10¹⁰

Answer 284

Inversion point

Answer 285

Melting point

Answer 286

Boiling point

Answer 287

Sublimation point

Answer 288

1.12 cm¯¹

Answer 289

0.918 cm¯¹

Answer 290

0.142 cm¯¹

Answer 291

0.66 cm¯¹

Answer 292

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

Answer 293

Hg is more inert than Pt

Answer 294

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

Answer 295

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

Answer 296

Ca(NO₃)₂

Answer 297

Cathode is regarded as negative electrode

Answer 298

Salt bridge maintains the electrical neutrality of the solution

Answer 299

Chemical energy is converted into electrical energy

Answer 300

Electrons are released at anode

Answer 301

Phosphorus acid

Answer 302

Nitric acid

Answer 303

Sulphuric acid

Answer 304

Boric acid

Answer 305

Electrical energy is converted into chemical energy

Answer 306

Chemical energy is converted into heat

Answer 307

Chemical energy is converted into electricity

Answer 308

Electrical energy is converted into heat

Answer 309

Altered reaction in presence of H₂O

Answer 310

Electrochemical phenomenon

Answer 311

Interaction

Answer 312

Union between two light metals and a heavy metal

Answer 313

It has not potential

Answer 314

Electrons flow cathode to anode within the electrolytic solution

Answer 315

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

Answer 316

Electrons flow from cathode to anode through the external battery

Answer 317

None of these

Answer 318

Daniel cell

Answer 319

Non rechargeable

Answer 320

Electrolytic cell

Answer 321

Rechargeable

Answer 322

– 1.17 V

Answer 323

– 0.35 V

Answer 324

Hg₂Cl₂

Answer 325

0.1 M NaCl

Answer 326

0.1 M Glucose

Answer 327

0.1 M Sucrose

Answer 328

0.1 M BaCl₂

Answer 329

760 mm of Hg

Answer 330

Slightly more than 1 atom

Answer 331

Depends on mass of electrolyte

Answer 332

Remains unchanged with dilution

Answer 333

Decreases with dilution

Answer 334

Increases with dilution

Answer 335

Neutralization

Answer 336

20g NaCl/100ml

Answer 337

10.0g NaCl/100ml

Answer 338

5.58g NaCl/100m

Answer 339

58.5g NaCl/100ml

Answer 340

Sound energy

Answer 341

Heat energy

Answer 342

Magnetic energy

Answer 343

Electrical energy

Answer 344

Loses electrons

Answer 345

Is oxidized

Answer 346

Gains electrons

Answer 347

Is hydrolysed

Answer 348

A reaction in a solution

Answer 349

Proton transfer

Answer 350

Electron transfer

Answer 351

Ion combination reaction

Answer 352

pH is changed

Answer 353

Acts as a catalyst

Answer 354

Gains electrons

Answer 355

Loses electrons

Answer 356

Solvent particles

Answer 357

Dilution increases

Answer 358

Pressure increases

Answer 359

Dilution decreases

Answer 360

278 S cm² mol¯¹

Answer 361

302 S cm² mol¯¹

Answer 362

176 S cm² mol¯¹

Answer 363

128 S cm² mol¯¹

Answer 364

Not particular

Answer 365

None of these

Answer 366

Anode to cathode through the solution

Answer 367

Cathode to anode through the solution

Answer 368

Cathode to anode through the external circuit

Answer 369

Anode to cathode through the external circuit

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