Chemistry Chemical Bonding Online Mcqs Test

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Question 1

1. Keeping in view the bonding molecular orbitals, find the incorrect statement

Answer

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

Answer

Bonding molecular orbitals have low electron density between the two nuclei

Answer

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

Answer

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

Question 2

2. On sp3 hybridization

Answer

Four p-orbitals are involved

Answer

One s and 3 p-orbitals are involved

Answer

All p-orbitals are involved

Answer

One p-orbital is involved

Question 3

3. How many molecular orbitals may be constructed from the valence shell orbitals of the constituent atoms in CH₄?

Question 4

4. The number of significant figures in 0.00200 is

Question 5

5. Nuclear radiation is emitted by those elements whose

Answer

Nuclei are stable

Answer

Nuclei are unstable

Answer

Molecules are unstable

Answer

Molecules are stable

Question 6

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

Answer

Ionization energy

Answer

Electro negativity

Answer

Electron affinity

Answer

None of these

Question 7

7. Fluorine molecule is formed by

Answer

The overlap of two sp² hybrid orbitals

Answer

The axial s-p overlap

Answer

The sidewise p-p overlap

Answer

The axial p-p overlap

Question 8

8. 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 9

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

Answer

None of these

Answer

Orbital overlap will not occur

Answer

Bonding will not occur

Answer

Both A and B are correct

Question 10

10. In Millikan oil – drop experiment, the charges on several different oil drops were as: -5.92. – 4.44, -2.96, -8.88. The units are arbitrary. Choose the likely value of the electronic charge in these arbitrary units?

Question 11

11. What happens to IP value if shielding effect is greater?

Answer

Remain same

Question 12

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

Answer

Ionization energy

Answer

Electron affinity

Answer

Electro negativity

Answer

None of these

Question 13

13. Which orbital of the following has a principal quantum number of 3 and an angular momentum quantum number of 27?

Question 14

14. Which one of these is weakest?

Answer

Van der Waal’s forces

Answer

Ionic bond

Answer

Covalent bond

Answer

Metallic bond

Question 15

15. The carbon atoms in calcium carbide are held by

Answer

2 sigma bonds

Answer

2π and one σ bond

Answer

Ionic bonds

Answer

2 covalent, one co-ordinate bond

Question 16

16. In the ground state, an element has 13 electrons in its M shell. The element is

Question 17

17. 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 18

18. Colour of the glow produced 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

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 19

19. According to VSEPR theory, the shape of the water molecule is

Answer

Octahedral

Answer

Distorted tetrahedral

Answer

Planar triangle

Question 20

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

Question 21

21. Which quantum number is sufficient to describe the electron is hydrogen atom?

Question 22

22. Which of the following is a non-directional orbital

Question 23

23. 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 24

24. The configuration 1s² 2s² 2p⁵ 3s¹ shows

Answer

Ground state of fluorine atom

Answer

Excited state of neon

Answer

Excited state of O¯₂

Answer

Excited state of fluorine

Question 25

25. 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 in NO is greater than in NO⁺

Answer

Bond length in NO⁺ is equal to that in NO

Answer

Bond length is unpredictable

Question 26

26. Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to the highest energy

Answer

Visible, ultraviolet, infrared, gamma rays

Answer

X – radiation, visible, infrared, microwave

Answer

Radio, visible, infrared, ultraviolet

Answer

Microwave, infrared, visible, ultraviolet

Question 27

27. For principle quantum number, n = 4, the total number of orbitals having 1 = 3 is

Question 28

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

Question 29

29. ____________ has their outermost shell complete in atomic form

Answer

Alkali metals

Answer

Gun metals

Answer

Noble gases

Answer

Coinage metals

Question 30

30. By combining n atomic orbital, numbers of hybrid orbitals will be

Answer

Impossible to predict

Question 31

31. The shape of H₃O⁺ is

Answer

Triangular planar

Answer

Tetrahedral

Question 32

32. The velocity of photon is

Answer

Depends on its source

Answer

Depends on its wavelength

Answer

Independent of its wavelength

Answer

Equal to square

Question 33

33. Pick out the molecule which has zero dipole moment

Question 34

34. Among the alkaline earth metals the element forming predominantly covalent compounds is

Question 35

35. The spectrum of He is expected to be similar to that of

Question 36

36. Which of the following statements about positive ions is incorrect?

Answer

They are formed when electros are formed from atoms

Answer

They are also known as cations

Answer

They are larger than the atoms from which they were formed

Answer

They are smaller than the atoms from which they were formed

Question 37

37. According to MO theory, the species O⁺₂ possesses

Answer

Three unpaired electrons

Answer

Bond order of 2.5

Answer

Stability lower then O₂

Answer

Diamagnetic character

Question 38

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

Answer

A stream of electrons

Answer

Can be deflected by magnetic fields

Answer

Charged particles

Answer

Move with speed as that of light

Question 39

39. In BrF₃ molecule, the lone pairs occupy equatorial positions to minimize

Answer

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

Answer

Bond pair – bond pair repulsion only

Answer

Lone pair – lone pair repulsion only

Answer

Lone pair – bond pair repulsion only

Question 40

40. Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

Question 41

41. Energy of an atom in a compound is

Answer

Higher than individual

Answer

Lesser than individual

Answer

Impossible to predict

Question 42

42. The shape of the molecule SF₂Cl₂ is

Answer

Tetrahedral

Answer

Octahedral

Answer

Trigonal bipyramidal

Question 43

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

Question 44

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

Answer

They have completely filled s and p orbitals

Answer

They are mono atomic gases

Answer

They have high ionization energies

Answer

They do not react with one another

Question 45

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

Answer

Electron affinity

Answer

None of these

Answer

Electronegativity

Answer

Ionization energy

Question 46

46. 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 47

47. Which of the following geometry is associated with the compound in which the central atom assumes sp³ d hybridization?

Answer

Trigonal bipyramidal

Question 48

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

Question 49

49. H-bonding is not present in

Answer

Hydrogen fluoride

Answer

Hydrogen sulphide

Question 50

50. When two hydrogen atoms approach to form a chemical bond

Answer

The two atoms start ionization

Answer

They energy of atoms increases

Answer

The repulsive force dominate the attractive forces

Answer

The attractive forces dominate the repulsive forces

Question 51

51. In a double bond connecting two atoms there is a sharing of

Answer

6 electrons

Answer

2 electrons

Answer

1 electron

Answer

4 electrons

Question 52

52. An electron has principal quantum number 3. The number of its (i) subshells and (ii) orbitals would be respectively

Question 53

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

Answer

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

Answer

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

Answer

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

Answer

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

Question 54

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

Answer

Tetrahedral

Answer

Planar triangle

Answer

Square planar

Question 55

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

Question 56

56. Which of the sub – atomic particles is not charged?

Question 57

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

Question 58

58. Deflection of blue light is lesser than violet because

Answer

Blue is absorbed more easily

Answer

Blue has higher wavelength

Answer

Blue is darker colour

Answer

Blue has more energy

Question 59

59. Nitrogen gas is chemically inert gas due to the reason that

Answer

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

Answer

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

Answer

It has high heat of dissociation

Answer

It has high electronegativity

Question 60

60. The boiling point of heavy water is

Question 61

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

Answer

Variable trend

Question 62

62. Effective magnetic moment of Sc³ ion is

Question 63

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

Question 64

64. Which of the following is a non-directional orbital?

Answer 127

Concentrated acids

Answer 128

Non-polar solvents

Answer 129

Polar solvents

Answer 130

All solvents

Answer 131

By gaining three electrons

Answer 132

By losing three electrons

Answer 133

By losing two electrons

Answer 134

By gaining two electrons

Answer 135

Two sigma, one pi

Answer 136

One sigma, two pi

Answer 137

One sigma, one pi

Answer 138

Two sigma, two pi

Answer 139

5.316 x 10¯²³ g

Answer 140

5.316 x 10¯²³ g

Answer 141

2.657 x 10¯²³ g

Answer 142

Electronegative character of elements

Answer 143

Electropositive character of elements

Answer 144

Octet rule

Answer 145

Pauli exclusion principle

Answer 146

Triangular pyramidal

Answer 147

Tetrahedral

Answer 148

Triangular planar

Answer 149

Triangular bipyramidal

Answer 150

Photosensitivity of sodium

Answer 151

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

Answer 152

Sublimation of metallic sodium to give yellow vapour

Answer 153

Low ionization energy of sodium

Answer 154

Ejection of some potassium atoms occurs

Answer 155

The absorption of electrons takes place

Answer 156

There is no effect

Answer 157

Ejection of electrons takes place

Answer 158

Tetrahedral

Answer 159

Triangular

Answer 160

Van der Waal forces or London dispersion forces

Answer 161

Hydrogen bonds

Answer 162

Covalent forces

Answer 163

All of these

Answer 164

Two unpaired electron

Answer 165

One unpaired electron

Answer 166

No unpaired electron

Answer 167

None of these

Answer 168

Covalent attraction

Answer 169

Hydrogen bond formation

Answer 170

Van der Waal’s forces

Answer 171

Dipole interaction

Answer 172

Triangular

Answer 173

Tetrahedral

Answer 174

Square planner

Answer 175

Sixth Bohr orbit to the third Bohr orbit

Answer 176

Seventh Bohr orbit to the third Bohr orbit

Answer 177

Fourth Bohr orbit to the first Bohr orbit

Answer 178

Fifth Bohr orbit to the second Bohr orbit

Answer 179

Tetrahedron

Answer 180

Trigonal bipyramidal

Answer 181

Tetrahedral

Answer 182

Square planar

Answer 183

Aufbau principal

Answer 184

Hund’s rule

Answer 185

Pauli’s exclusion principle

Answer 186

Attractive force

Answer 187

Interaction

Answer 188

All of above represent same entity

Answer 189

Quarternization of angular members

Answer 190

Heisenberg’s uncertainty principle

Answer 191

Plank’s quantum theory

Answer 192

Quarternization of energy of electrons

Answer 193

Multiplication of atomic orbitals

Answer 194

Addition of atomic orbitals

Answer 195

Subtraction of atomic orbitals

Answer 196

None of these

Answer 197

There may not be a possibility of chemical reaction

Answer 198

Lemon juice is dangerous for health

Answer 199

Water should be preferred over lemon Juice for drinking

Answer 200

There may be a possibility of a chemical reaction

Answer 201

Tetrahedral

Answer 202

Square planner

Answer 203

Triangular

Answer 204

Generally increases from left to right in a period

Answer 205

Increase from top to bottom in a group

Answer 206

Does not change in a period

Answer 207

Does not change in a group

Answer 208

4, 1, 1, ½

Answer 209

4, 1, 0, ½

Answer 210

4, 4, 0, ½

Answer 211

4, 0, 0, ½

Answer 212

Electron rich

Answer 213

Octet is complete

Answer 214

No such acids exist

Answer 215

Electron deficient

Answer 216

6.63 x 10¯³⁵ m

Answer 217

6.65 x 10¯³⁵ m

Answer 218

6.63 x 10¯³⁴ m

Answer 219

6.63 x 10¯³³ m

Answer 220

Linear geometry

Answer 221

SP hybridization

Answer 222

Dipole moment is zero

Answer 223

Hybrid and un hybrid orbitals

Answer 224

Hybrid orbitals

Answer 225

Atomic orbital and hybrid orbital

Answer 226

Un-hybrid orbitals

Answer 227

The nature of discharge tube

Answer 228

All of these

Answer 229

The nature of electrode

Answer 230

The nature of residual gas

Answer 231

Hydrogen sulphide is a weak acid

Answer 232

Sulphure has high electronegativity than oxygen

Answer 233

Water has higher molecular weight

Answer 234

Water molecules associate through hydrogen bonding

Answer 235

1/2 x ɜ₀

Answer 236

Cannot be determined

Answer 237

Both are equal

Answer 238

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

Answer 239

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

Answer 240

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

Answer 241

Each bonding molecular orbital can accommodate only one electron

Answer 242

Carbon tetrachloride

Answer 243

Carbon dioxide

Answer 244

First decreases then increases

Answer 245

6.02 x 10²³ J/mol

Answer 246

6.02 x 10¹⁶ J/mol

Answer 247

10¯⁷ J/mol

Answer 248

Nine σ and nine π

Answer 249

Eight σ and eight π

Answer 250

Five π and nine σ

Answer 251

Nine σ and seven π

Answer 252

Vaporization

Answer 253

Crystallization

Answer 254

Distillation

Answer 255

Colour spectrum

Answer 256

A pair of valence electrons not involved in bonding

Answer 257

A pair of electrons involved in bonding

Answer 258

A pair of valence electrons

Answer 259

A pair of electrons

Answer 260

Metallic bond

Answer 261

Ionic bond

Answer 262

n = 2, l = 1

Answer 263

n = 2, l = 0

Answer 264

n = 1, l = 2

Answer 265

n = 1, l = 0

Answer 266

Electronegativity

Answer 267

Electron affinity

Answer 268

Ionization energy

Answer 269

Atomic size

Answer 270

First increases then decreases

Answer 271

First decreases then increases

Answer 272

always same irrespective of its hybrid state

Answer 273

sp³-hybridized carbon

Answer 274

sp- hybridized carbon

Answer 275

sp²- hybridized carbon

Answer 276

Electrovalent bond

Answer 277

Covalent bond

Answer 278

Double bond

Answer 279

Co-ordinate bond

Answer 280

Ionization potential

Answer 281

Electron affinity

Answer 282

Electronegativity

Answer 283

Activation energy

Answer 284

Nonpolar covalent bonds only

Answer 285

Hydrogen bonds only

Answer 286

Ionic and nonpolar hydrogen bonds

Answer 287

Both polar covalent and hydrogen bonds

Answer 288

Equal to 1.7

Answer 289

Greater than 1.7

Answer 290

Lesser then 1.7

Answer 291

No specificity exist

Answer 292

10.2340178

Answer 293

Gamma rays

Answer 294

Larger wavelength

Answer 295

Shorter wavelength

Answer 296

X-rays not produced

Answer 297

High, very negative

Answer 298

Low very negative

Answer 299

None of these

Answer 300

Low, positive or slightly negative

Answer 301

Chemical bond

Answer 302

Van der Waal’s force

Answer 303

Dispersion force

Answer 304

London force

Answer 305

Liquid NH3

Answer 306

Liquid HCl

Answer 307

Three pi-bonds

Answer 308

One sigma bond and two pi-bonds

Answer 309

Three sigma bonds

Answer 310

Two sigma bonds and one pi-bond

Answer 311

H – NH₂

Answer 312

It is equal to the 1st ionization energy

Answer 313

It is always less than 1st ionization energy

Answer 314

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

Answer 315

It is always greater than 1st ionization energy

Answer 316

Trigonal bipyramidal

Answer 317

Triangular

Answer 318

Square planner

Answer 319

Octahedral

Answer 320

Fluorides is more electronegative

Answer 321

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer 322

Fluorides are more electronegative

Answer 323

NH₃ is pyramidal in shape while BF₃ is planar

Answer 324

Octahedral

Answer 325

Square planar

Answer 326

Trigonal bipyramidal

Answer 327

1.7588 x 10¹¹

Answer 328

9.1095 x 10¯³¹

Answer 329

1.7588 x 10²⁰

Answer 330

6.02 x 10²³

Answer 331

1 bond pair 3 lone pair

Answer 332

3 bond pair one lone pair

Answer 333

3 lone pair 1 bond pair

Answer 334

2 bond pair 2 lone pair

Answer 335

Dispersion force

Answer 336

Dipole-dipole interaction

Answer 337

Ion-dipole interaction

Answer 338

First decreases then increases

Answer 339

First increases then decreases

Answer 340

sp² hybrid orbitals

Answer 341

sp³ hybrid orbitals

Answer 342

s orbitals

Answer 343

p orbitals

Total Questions:	187
Time Allowed:	60 Minutes
Total Marks:	187
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Chemistry Chemical Bonding Question and Answer

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