Chemistry Chemical Bonding Online Mcqs Test

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Question 1

1. The energy of a photon is given as, ∆ E/atom = 3.03 x 10¯¹⁹ J atom¯¹ then, the wavelength (λ) of the photon is

Question 2

2. Atom with higher atomic number produces X-rays of

Answer

X-rays not produced

Answer

Gamma rays

Answer

Shorter wavelength

Answer

Larger wavelength

Question 3

3. The number of anti-bonding electron pairs in O₂²¯ molecular ion on the basis of MOT is

Question 4

4. Bond order for N2 molecule is

Question 5

5. Which one of the following molecules shows high percentage of ionic character?

Question 6

6. When 6d orbital is complete, the entering electron goes into

Question 7

7. Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question 8

8. Which one shows high % age of the ionic character?

Question 9

9. Which of the following is to isoelectronic with rest of three?

Question 10

10. In OF₂, number of bond pairs and lone pairs of electrons are respectively

Question 11

11. The number of σ and π-bonds present in pent-4-en-l yne is

Question 12

12. Noble gases are most stable of all other elements because

Answer

They have completely filled s and p orbitals

Answer

They have high ionization energies

Answer

They are mono atomic gases

Answer

They do not react with one another

Question 13

13. The carbon atoms in calcium carbide are held by

Answer

2π and one σ bond

Answer

2 sigma bonds

Answer

Ionic bonds

Answer

2 covalent, one co-ordinate bond

Question 14

14. Which of the following has maximum e/m value for positive rays?

Question 15

15. If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (Debye) but the experimental value of dipole moment was 1.03 D. Calculate the percentage ionic character.

Question 16

16. Colour of the glow produced in the discharge tube

Answer

Does not depend on the nature of the gas used in the discharge tube

Answer

Depends on the pressure in the discharge tube

Answer

Does not depend on the nature of the gas used in the discharge tube

Answer

Depends on the gas used in the discharge tube

Question 17

17. The nature of inter-particle forces in benzene is

Answer

Dipole-dipole interaction

Answer

Dispersion force

Answer

Ion-dipole interaction

Question 18

18. Covalent compounds are soluble in

Answer

All solvents

Answer

Non-polar solvents

Answer

Concentrated acids

Answer

Polar solvents

Question 19

19. Which is not true with respect to cathode rays?

Answer

Can be deflected by magnetic fields

Answer

Charged particles

Answer

A stream of electrons

Answer

Move with speed as that of light

Question 20

20. Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

Answer

Orbital overlap will not occur

Answer

None of these

Answer

Bonding will not occur

Answer

Both A and B are correct

Question 21

21. The correct set of quantum numbers (n, l and m) respectively of the unpaired electron of chlorine atom is:

Question 22

22. The twelve enter most electrons in O₂ molecule are distributed according to MOT as under. Find the correct one.

Answer

12 in bonding molecular orbitals, and zero in anti-bonding molecular orbitals

Answer

10 in bonding molecular orbitals and 2 in anti-bonding molecular orbitals

Answer

9 in bonding molecular orbitals and 3 in anti-bonding molecular orbitals

Answer

8 in bonding molecular orbitals, 4 in anti-bonding molecular orbitals

Question 23

23. The spectrum of helium is expected to be similar to that of

Question 24

24. Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question 25

25. Azimuthal quantum number of last electron of ₁₁Na is

Question 26

26. In O2 each oxygen atom is hybridized

Question 27

27. How many sigma and pi bonds are present in tetra cyano ethylene?

Answer

Five π and nine σ

Answer

Nine σ and seven π

Answer

Nine σ and nine π

Answer

Eight σ and eight π

Question 28

28. Which of the following has more unpaired d-electrons?

Question 29

29. Energy released or absorbed when electrons are added in atom is

Answer

Electron affinity

Answer

Ionization potential

Answer

Electronegativity

Answer

Activation energy

Question 30

30. Choose the correct statement

Answer

As bonding molecular orbitals become more stable, anti-bonding molecular orbital become equally less stable

Answer

Each bonding molecular orbital can accommodate only one electron

Answer

The molecular orbitals in a molecule equals twice the number of constituent atomic orbitals

Answer

In molecular orbitals, the number of bonding electrons equals the number of anti-bonding electrons

Question 31

31. The relative attraction of the nucleus for the electrons in a chemical bond is called

Answer

Electro negativity

Answer

None of these

Answer

Electron affinity

Answer

Ionization energy

Question 32

32. Inter molecular forces in solid hydrogen are

Answer

Van der Waal forces or London dispersion forces

Answer

Covalent forces

Answer

Hydrogen bonds

Answer

All of these

Question 33

33. Which of the following orbitals have a dumb bell shape?

Question 34

34. Effective magnetic moment of Sc³ ion is

Question 35

35. In acetylene molecule, the two carbon atoms are linked by

Answer

One sigma bond and two pi-bonds

Answer

Two sigma bonds and one pi-bond

Answer

Three sigma bonds

Answer

Three pi-bonds

Question 36

36. Nuclear radiation is emitted by those elements whose

Answer

Molecules are unstable

Answer

Molecules are stable

Answer

Nuclei are unstable

Answer

Nuclei are stable

Question 37

37. A long a period E.N __________ from left to right

Answer

Variable trend

Question 38

38. Pi bonds are produced by overlapping of

Answer

Hybrid orbitals

Answer

Atomic orbital and hybrid orbital

Answer

Un-hybrid orbitals

Answer

Hybrid and un hybrid orbitals

Question 39

39. Which of the following species has lone pair of electrons on central atom?

Question 40

40. The energy of the first electron in helium will be

Question 41

41. The electronegativity of elements in a period from left to right

Answer

First increases then decreases

Answer

First decreases then increases

Question 42

42. With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Answer

Decreases for low value of Z and increases for higher value of Z

Answer

Remains constant

Question 43

43. In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question 44

44. Which of the following is the best explanation that CO₂ is a non-polar molecule?

Answer

SP hybridization

Answer

Dipole moment is zero

Answer

Linear geometry

Question 45

45. Fluorine has an atomic number 9 and Chlorine has 17. Which one has the highest electron affinity?

Answer

Cannot be determined

Answer

Both are equal

Question 46

46. Choose the correct statement about 2nd ionization energy

Answer

It may be greater or less than the 1st ionization depending upon ht nature of the element

Answer

It is always less than 1st ionization energy

Answer

It is always greater than 1st ionization energy

Answer

It is equal to the 1st ionization energy

Question 47

47. Bond angle in water is

Question 48

48. When 2 lone pair and 2 bond pair are around the central atom reduction in the bond angle is up to. (in degrees)

Question 49

49. A chemist poured juice on soil. Which idea may he have in his mind?

Answer

There may not be a possibility of chemical reaction

Answer

There may be a possibility of a chemical reaction

Answer

Lemon juice is dangerous for health

Answer

Water should be preferred over lemon Juice for drinking

Question 50

50. Which of the following is the correct electron – dot formula of CO₂?

Question 51

51. Formulation of chemical bond between atoms of elements is based on

Answer

Pauli exclusion principle

Answer

Electronegative character of elements

Answer

Electropositive character of elements

Answer

Octet rule

Question 52

52. Electronic configuration of K is

Question 53

53. The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1 : 1 is

Answer

Crystallization

Answer

Distillation

Answer

Colour spectrum

Answer

Vaporization

Question 54

54. Water (H₂O) is liquid while hydrogen sulphide (H₂O) is a gas because

Answer

Sulphure has high electronegativity than oxygen

Answer

Water has higher molecular weight

Answer

Water molecules associate through hydrogen bonding

Answer

Hydrogen sulphide is a weak acid

Question 55

55. The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question 56

56. The shape of ClO₃ according to valence shell electron pair repulsion theory will be

Answer

Tetrahedral

Answer

Square planar

Answer

Planar triangle

Question 57

57. The energy required to remove electron from an atom is called

Question 58

58. Ammonia has a net dipole moment while boron trifluoride has zero dipole moment because

Answer

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer

NH₃ is pyramidal in shape while BF₃ is planar

Answer

Fluorides is more electronegative

Answer

Fluorides are more electronegative

Question 59

59. A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that result was wrong. What is the correct result?

Answer

10.2340178

Question 60

60. Fluorine molecule is formed by

Answer

The overlap of two sp² hybrid orbitals

Answer

The axial s-p overlap

Answer

The axial p-p overlap

Answer

The sidewise p-p overlap

Question 61

61. Which of the following is not absolute term of element?

Answer

Ionization energy

Answer

Atomic size

Answer

Electron affinity

Answer

Electronegativity

Question 62

62. The total number of possible values of magnetic quantum number for the value of l = 3 is

Question 63

63. Which of the following compounds can form hydrogen bond?

Question 64

64. The bond order in NO is 2.5 while that is NO⁺ is 3. Which of the following statements is true for these two species?

Answer

Bond length in NO⁺ is greater than in NO

Answer

Bond length is unpredictable

Answer

Bond length in NO is greater than in NO⁺

Answer

Bond length in NO⁺ is equal to that in NO

Answer 118

Subtraction of atomic orbitals

Answer 119

Multiplication of atomic orbitals

Answer 120

Addition of atomic orbitals

Answer 121

None of these

Answer 122

High, very negative

Answer 123

None of these

Answer 124

Low very negative

Answer 125

Low, positive or slightly negative

Answer 126

Carbon tetrachloride

Answer 127

Carbon dioxide

Answer 128

Triangular planar

Answer 129

Triangular pyramidal

Answer 130

Tetrahedral

Answer 131

Triangular bipyramidal

Answer 132

n = 1, l = 2

Answer 133

n = 2, l = 1

Answer 134

n = 1, l = 0

Answer 135

n = 2, l = 0

Answer 136

Diamagnetic character

Answer 137

Bond order of 2.5

Answer 138

Stability lower then O₂

Answer 139

Three unpaired electrons

Answer 140

Remain same

Answer 141

1/2 x ɜ₀

Answer 142

It has high electronegativity

Answer 143

Some of the electrons are also present in anti-bonding molecular orbitals

Answer 144

There is triple bond between nitrogen atoms which make the molecule quite stable

Answer 145

It has high heat of dissociation

Answer 146

Electron rich

Answer 147

Electron deficient

Answer 148

No such acids exist

Answer 149

Octet is complete

Answer 150

Triangular

Answer 151

Square planner

Answer 152

Tetrahedral

Answer 153

Covalent bond

Answer 154

Double bond

Answer 155

Electrovalent bond

Answer 156

Co-ordinate bond

Answer 157

Sixth Bohr orbit to the third Bohr orbit

Answer 158

Seventh Bohr orbit to the third Bohr orbit

Answer 159

Fourth Bohr orbit to the first Bohr orbit

Answer 160

Fifth Bohr orbit to the second Bohr orbit

Answer 161

They are smaller than the atoms from which they were formed

Answer 162

They are formed when electros are formed from atoms

Answer 163

They are also known as cations

Answer 164

They are larger than the atoms from which they were formed

Answer 165

6.02 x 10¹⁶ J/mol

Answer 166

6.02 x 10²³ J/mol

Answer 167

10¯⁷ J/mol

Answer 168

One p-orbital is involved

Answer 169

All p-orbitals are involved

Answer 170

One s and 3 p-orbitals are involved

Answer 171

Four p-orbitals are involved

Answer 172

6.63 x 10¯³⁵ m

Answer 173

6.63 x 10¯³⁴ m

Answer 174

6.63 x 10¯³³ m

Answer 175

6.65 x 10¯³⁵ m

Answer 176

Ionization energy

Answer 177

None of these

Answer 178

Electro negativity

Answer 179

Electron affinity

Answer 180

Triangular

Answer 181

Square planner

Answer 182

Trigonal bipyramidal

Answer 183

Octahedral

Answer 184

Two sigma, one pi

Answer 185

One sigma, one pi

Answer 186

One sigma, two pi

Answer 187

Two sigma, two pi

Answer 188

Octahedral

Answer 189

Trigonal bipyramidal

Answer 190

Square planar

Answer 191

Triangular

Answer 192

Square planner

Answer 193

Tetrahedral

Answer 194

Liquid NH3

Answer 195

Liquid HCl

Answer 196

Trigonal bipyramidal

Answer 197

Hydrogen sulphide

Answer 198

Hydrogen fluoride

Answer 199

No specificity exist

Answer 200

Greater than 1.7

Answer 201

Equal to 1.7

Answer 202

Lesser then 1.7

Answer 203

Tetrahedron

Answer 204

Blue is absorbed more easily

Answer 205

Blue is darker colour

Answer 206

Blue has more energy

Answer 207

Blue has higher wavelength

Answer 208

Higher than individual

Answer 209

Impossible to predict

Answer 210

Lesser than individual

Answer 211

Ejection of some potassium atoms occurs

Answer 212

There is no effect

Answer 213

The absorption of electrons takes place

Answer 214

Ejection of electrons takes place

Answer 215

4, 1, 1, ½

Answer 216

4, 1, 0, ½

Answer 217

4, 4, 0, ½

Answer 218

4, 0, 0, ½

Answer 219

H – NH₂

Answer 220

Radio, visible, infrared, ultraviolet

Answer 221

Microwave, infrared, visible, ultraviolet

Answer 222

X – radiation, visible, infrared, microwave

Answer 223

Visible, ultraviolet, infrared, gamma rays

Answer 224

Trigonal bipyramidal

Answer 225

Tetrahedral

Answer 226

Square planar

Answer 227

All of above represent same entity

Answer 228

Attractive force

Answer 229

Interaction

Answer 230

2.657 x 10¯²³ g

Answer 231

5.316 x 10¯²³ g

Answer 232

5.316 x 10¯²³ g

Answer 233

By losing two electrons

Answer 234

By losing three electrons

Answer 235

By gaining two electrons

Answer 236

By gaining three electrons

Answer 237

The nature of electrode

Answer 238

The nature of residual gas

Answer 239

The nature of discharge tube

Answer 240

All of these

Answer 241

2 bond pair 2 lone pair

Answer 242

3 lone pair 1 bond pair

Answer 243

3 bond pair one lone pair

Answer 244

1 bond pair 3 lone pair

Answer 245

Triangular

Answer 246

Tetrahedral

Answer 247

s orbitals

Answer 248

p orbitals

Answer 249

sp² hybrid orbitals

Answer 250

sp³ hybrid orbitals

Answer 251

sp²- hybridized carbon

Answer 252

sp- hybridized carbon

Answer 253

sp³-hybridized carbon

Answer 254

always same irrespective of its hybrid state

Answer 255

A pair of valence electrons

Answer 256

A pair of valence electrons not involved in bonding

Answer 257

A pair of electrons

Answer 258

A pair of electrons involved in bonding

Answer 259

First decreases then increases

Answer 260

Metallic bond

Answer 261

Ionic bond

Answer 262

Quarternization of angular members

Answer 263

Heisenberg’s uncertainty principle

Answer 264

Quarternization of energy of electrons

Answer 265

Plank’s quantum theory

Answer 266

Electronegativity

Answer 267

None of these

Answer 268

Electron affinity

Answer 269

Ionization energy

Answer 270

Two unpaired electron

Answer 271

None of these

Answer 272

No unpaired electron

Answer 273

One unpaired electron

Answer 274

Covalent bond

Answer 275

Metallic bond

Answer 276

Ionic bond

Answer 277

Van der Waal’s forces

Answer 278

Impossible to predict

Answer 279

4 electrons

Answer 280

1 electron

Answer 281

2 electrons

Answer 282

6 electrons

Answer 283

Octahedral

Answer 284

Trigonal bipyramidal

Answer 285

Tetrahedral

Answer 286

Hydrogen bonds only

Answer 287

Nonpolar covalent bonds only

Answer 288

Both polar covalent and hydrogen bonds

Answer 289

Ionic and nonpolar hydrogen bonds

Answer 290

Excited state of fluorine

Answer 291

Excited state of O¯₂

Answer 292

Excited state of neon

Answer 293

Ground state of fluorine atom

Answer 294

Depends on its source

Answer 295

Independent of its wavelength

Answer 296

Equal to square

Answer 297

Depends on its wavelength

Answer 298

1.7588 x 10¹¹

Answer 299

6.02 x 10²³

Answer 300

9.1095 x 10¯³¹

Answer 301

1.7588 x 10²⁰

Answer 302

Alkali metals

Answer 303

Gun metals

Answer 304

Noble gases

Answer 305

Coinage metals

Answer 306

Chemical bond

Answer 307

Van der Waal’s force

Answer 308

London force

Answer 309

Dispersion force

Answer 310

First decreases then increases

Answer 311

First increases then decreases

Answer 312

The repulsive force dominate the attractive forces

Answer 313

The attractive forces dominate the repulsive forces

Answer 314

They energy of atoms increases

Answer 315

The two atoms start ionization

Answer 316

Van der Waal’s forces

Answer 317

Hydrogen bond formation

Answer 318

Covalent attraction

Answer 319

Dipole interaction

Answer 320

Lone pair – bond pair repulsion only

Answer 321

Lone pair – lone pair repulsion and lone pair – bond pair repulsion

Answer 322

Bond pair – bond pair repulsion only

Answer 323

Lone pair – lone pair repulsion only

Answer 324

Hund’s rule

Answer 325

Aufbau principal

Answer 326

Pauli’s exclusion principle

Answer 327

Triangular planar

Answer 328

Tetrahedral

Answer 329

Low ionization energy of sodium

Answer 330

Photosensitivity of sodium

Answer 331

Sublimation of metallic sodium to give yellow vapour

Answer 332

Emission of excess energy absorbed as a radiation in the visible region

Answer 333

Bonding molecular possess less energy than atomic orbitals from which they are formed

Answer 334

Bonding molecular orbitals are formed when the electrons waves are undergo constructive interference

Answer 335

Every electron in the bonding molecular orbital contributes to the attraction between atoms

Answer 336

Bonding molecular orbitals have low electron density between the two nuclei

Answer 337

Distorted tetrahedral

Answer 338

Octahedral

Answer 339

Planar triangle

Answer 340

Increase from top to bottom in a group

Answer 341

Does not change in a group

Answer 342

Does not change in a period

Answer 343

Generally increases from left to right in a period

Total Questions:	187
Time Allowed:	60 Minutes
Total Marks:	187
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Important Chemistry Chemical Bonding Question and Answer

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