Chemistry Chemical Bonding Online Mcqs Test

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Question 1

1. Which of the following element’s outermost orbits last electron has magnetic quantum number m = 0?

Question 2

2. Element having the smallest atomic radius among the following is

Question 3

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

Question 4

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

Answer

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

Answer

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

Answer

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

Answer

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

Question 5

5. 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 6

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

Answer

A stream of electrons

Answer

Charged particles

Answer

Move with speed as that of light

Answer

Can be deflected by magnetic fields

Question 7

7. 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 8

8. The structure of ICl₂¯ is

Answer

Octahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 9

9. Colour of the glow produced in the discharge tube

Answer

Depends on the gas used 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 pressure in the discharge tube

Question 10

10. According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be

Answer

Trigonal bipyramidal

Answer

Octahedral

Answer

Square planner

Answer

Triangular

Question 11

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

Answer

Lone pair – bond pair repulsion only

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

Question 12

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

Question 13

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

Question 14

14. In which one of the following does the central atom not possess can octet in its outer shell?

Question 15

15. Geometry of simple molecule having sp3 hybrid orbital is

Answer

Triangular

Answer

Square planner

Answer

Tetrahedral

Question 16

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

Answer

Three sigma bonds

Answer

Two sigma bonds and one pi-bond

Answer

Three pi-bonds

Answer

One sigma bond and two pi-bonds

Question 17

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

Question 18

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

Answer

Dispersion force

Answer

Dipole-dipole interaction

Answer

Ion-dipole interaction

Question 19

19. The force which holds the atoms together to form a compound is known as

Answer

London force

Answer

Dispersion force

Answer

Van der Waal’s force

Answer

Chemical bond

Question 20

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

Answer

Ionization energy

Answer

None of these

Answer

Electron affinity

Answer

Electro negativity

Question 21

21. 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

Both A and B are correct

Answer

Bonding will not occur

Answer

Orbital overlap will not occur

Question 22

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

Answer

First increases then decreases

Answer

First decreases then increases

Question 23

23. Which molecule is polar among the following?

Answer

Carbon dioxide

Answer

Carbon tetrachloride

Question 24

24. The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is

Answer

6.63 x 10¯³⁴ m

Answer

6.63 x 10¯³³ m

Answer

6.65 x 10¯³⁵ m

Answer

6.63 x 10¯³⁵ m

Question 25

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

Question 26

26. Covalent compounds are soluble in

Answer

Polar solvents

Answer

Non-polar solvents

Answer

Concentrated acids

Answer

All solvents

Question 27

27. Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Answer

Photosensitivity of sodium

Answer

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

Answer

Low ionization energy of sodium

Answer

Sublimation of metallic sodium to give yellow vapour

Question 28

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

Answer

Shorter wavelength

Answer

X-rays not produced

Answer

Larger wavelength

Answer

Gamma rays

Question 29

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

Answer

Nine σ and nine π

Answer

Five π and nine σ

Answer

Eight σ and eight π

Answer

Nine σ and seven π

Question 30

30. The electro negativities of F, Cl, Br and I are 4.0, 3.0, 2.8, 2.5 respectively. Hydrogen halide with a high percentage of ionic character is

Question 31

31. The central atom in BrF₅ has _?_ bonding pairs of electrons and _?_ non-bonding pairs of electrons.

Question 32

32. Which has the minimum bond angle?

Question 33

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

Answer

It has high electronegativity

Answer

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

Answer

It has high heat of dissociation

Answer

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

Question 34

34. Which of the following has zero depolemoment?

Question 35

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

Question 36

36. Inter molecular forces in solid hydrogen are

Answer

Covalent forces

Answer

Van der Waal forces or London dispersion forces

Answer

All of these

Answer

Hydrogen bonds

Question 37

37. Effective magnetic moment of Sc³ ion is

Question 38

38. The nature of positive rays depends upon

Answer

The nature of discharge tube

Answer

The nature of electrode

Answer

All of these

Answer

The nature of residual gas

Question 39

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

Question 40

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

Question 41

41. Fluorine molecule is formed by

Answer

The overlap of two sp² hybrid orbitals

Answer

The sidewise p-p overlap

Answer

The axial p-p overlap

Answer

The axial s-p overlap

Question 42

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

Answer

Remain same

Question 43

43. Quantum umber values for 2p orbitals are

Answer

n = 1, l = 2

Answer

n = 2, l = 0

Answer

n = 2, l = 1

Answer

n = 1, l = 0

Question 44

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

Question 45

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

Answer

4 electrons

Answer

1 electron

Answer

6 electrons

Answer

2 electrons

Question 46

46. Nuclear radiation is emitted by those elements whose

Answer

Molecules are unstable

Answer

Nuclei are stable

Answer

Nuclei are unstable

Answer

Molecules are stable

Question 47

47. Which kinds of bonding can be found in a sample of H₂O(l)?

Answer

Both polar covalent and hydrogen bonds

Answer

Nonpolar covalent bonds only

Answer

Ionic and nonpolar hydrogen bonds

Answer

Hydrogen bonds only

Question 48

48. Which carbon is more electronegative?

Answer

sp²- hybridized carbon

Answer

sp- hybridized carbon

Answer

sp³-hybridized carbon

Answer

always same irrespective of its hybrid state

Question 49

49. 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 50

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

Question 51

51. 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 52

52. Which one among the following does not have the hydrogen bond?

Answer

Liquid HCl

Answer

Liquid NH3

Question 53

53. 2nd orbit is away from nucleus for H-atom as compared to first orbit

Question 54

54. Which of the following has the greatest covalent character?

Question 55

55. The boiling point of heavy water is

Question 56

56. In CCl₄, the four valencies of carbon are directed towards the corners of a

Answer

Tetrahedron

Question 57

57. Which of the following value of Electronegativity difference corresponds the formation of Ionic Bond?

Answer

No specificity exist

Answer

Equal to 1.7

Answer

Greater than 1.7

Answer

Lesser then 1.7

Question 58

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

Question 59

59. Which hydrogen halide among the following has the highest percentage of ionic character?

Question 60

60. Which of the following hydrides has the lowest boiling point?

Question 61

61. Pi bonds are produced by overlapping of

Answer

Hybrid and un hybrid orbitals

Answer

Atomic orbital and hybrid orbital

Answer

Un-hybrid orbitals

Answer

Hybrid orbitals

Question 62

62. Bohr’s model atom is contradicted by

Answer

Plank’s quantum theory

Answer

Quarternization of angular members

Answer

Heisenberg’s uncertainty principle

Answer

Quarternization of energy of electrons

Question 63

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

Question 64

64. The number of significant figures in 0.00200 is

Answer 124

First decreases then increases

Answer 125

First increases then decreases

Answer 126

10¯⁷ J/mol

Answer 127

6.02 x 10¹⁶ J/mol

Answer 128

6.02 x 10²³ J/mol

Answer 129

Sulphure has high electronegativity than oxygen

Answer 130

Water molecules associate through hydrogen bonding

Answer 131

Water has higher molecular weight

Answer 132

Hydrogen sulphide is a weak acid

Answer 133

5.316 x 10¯²³ g

Answer 134

2.657 x 10¯²³ g

Answer 135

5.316 x 10¯²³ g

Answer 136

One sigma, two pi

Answer 137

One sigma, one pi

Answer 138

Two sigma, one pi

Answer 139

Two sigma, two pi

Answer 140

Tetrahedral

Answer 141

Triangular

Answer 142

Coinage metals

Answer 143

Noble gases

Answer 144

Gun metals

Answer 145

Alkali metals

Answer 146

Higher than individual

Answer 147

Lesser than individual

Answer 148

Impossible to predict

Answer 149

Activation energy

Answer 150

Electronegativity

Answer 151

Electron affinity

Answer 152

Ionization potential

Answer 153

Tetrahedral

Answer 154

Triangular bipyramidal

Answer 155

Triangular pyramidal

Answer 156

Triangular planar

Answer 157

sp² hybrid orbitals

Answer 158

sp³ hybrid orbitals

Answer 159

p orbitals

Answer 160

s orbitals

Answer 161

2 sigma bonds

Answer 162

2 covalent, one co-ordinate bond

Answer 163

Ionic bonds

Answer 164

2π and one σ bond

Answer 165

Remains constant

Answer 166

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

Answer 167

Two unpaired electron

Answer 168

One unpaired electron

Answer 169

None of these

Answer 170

No unpaired electron

Answer 171

Bond length in NO⁺ is equal to that in NO

Answer 172

Bond length is unpredictable

Answer 173

Bond length in NO⁺ is greater than in NO

Answer 174

Bond length in NO is greater than in NO⁺

Answer 175

Sixth Bohr orbit to the third Bohr orbit

Answer 176

Seventh Bohr orbit to the third Bohr orbit

Answer 177

Fifth Bohr orbit to the second Bohr orbit

Answer 178

Fourth Bohr orbit to the first Bohr orbit

Answer 179

Each bonding molecular orbital can accommodate only one electron

Answer 180

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

Answer 181

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

Answer 182

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

Answer 183

All of above represent same entity

Answer 184

Attractive force

Answer 185

Interaction

Answer 186

Covalent bond

Answer 187

Van der Waal’s forces

Answer 188

Ionic bond

Answer 189

Metallic bond

Answer 190

There may not be a possibility of chemical reaction

Answer 191

There may be a possibility of a chemical reaction

Answer 192

Water should be preferred over lemon Juice for drinking

Answer 193

Lemon juice is dangerous for health

Answer 194

Distorted tetrahedral

Answer 195

Planar triangle

Answer 196

Octahedral

Answer 197

Tetrahedral

Answer 198

Trigonal bipyramidal

Answer 199

Octahedral

Answer 200

H – NH₂

Answer 201

Covalent bond

Answer 202

Double bond

Answer 203

Electrovalent bond

Answer 204

Co-ordinate bond

Answer 205

1/2 x ɜ₀

Answer 206

The absorption of electrons takes place

Answer 207

There is no effect

Answer 208

Ejection of some potassium atoms occurs

Answer 209

Ejection of electrons takes place

Answer 210

Electron affinity

Answer 211

None of these

Answer 212

Electronegativity

Answer 213

Ionization energy

Answer 214

Four p-orbitals are involved

Answer 215

One p-orbital is involved

Answer 216

One s and 3 p-orbitals are involved

Answer 217

All p-orbitals are involved

Answer 218

10.2340178

Answer 219

Distillation

Answer 220

Colour spectrum

Answer 221

Vaporization

Answer 222

Crystallization

Answer 223

Multiplication of atomic orbitals

Answer 224

None of these

Answer 225

Addition of atomic orbitals

Answer 226

Subtraction of atomic orbitals

Answer 227

First decreases then increases

Answer 228

Impossible to predict

Answer 229

Low very negative

Answer 230

High, very negative

Answer 231

Low, positive or slightly negative

Answer 232

None of these

Answer 233

Electron deficient

Answer 234

Octet is complete

Answer 235

Electron rich

Answer 236

No such acids exist

Answer 237

They energy of atoms increases

Answer 238

The attractive forces dominate the repulsive forces

Answer 239

The two atoms start ionization

Answer 240

The repulsive force dominate the attractive forces

Answer 241

Variable trend

Answer 242

Tetrahedral

Answer 243

Triangular

Answer 244

Square planner

Answer 245

1.7588 x 10¹¹

Answer 246

6.02 x 10²³

Answer 247

1.7588 x 10²⁰

Answer 248

9.1095 x 10¯³¹

Answer 249

3 bond pair one lone pair

Answer 250

2 bond pair 2 lone pair

Answer 251

1 bond pair 3 lone pair

Answer 252

3 lone pair 1 bond pair

Answer 253

Diamagnetic character

Answer 254

Three unpaired electrons

Answer 255

Bond order of 2.5

Answer 256

Stability lower then O₂

Answer 257

4, 1, 0, ½

Answer 258

4, 0, 0, ½

Answer 259

4, 1, 1, ½

Answer 260

4, 4, 0, ½

Answer 261

Tetrahedral

Answer 262

Planar triangle

Answer 263

Square planar

Answer 264

They do not react with one another

Answer 265

They are mono atomic gases

Answer 266

They have completely filled s and p orbitals

Answer 267

They have high ionization energies

Answer 268

Does not change in a period

Answer 269

Generally increases from left to right in a period

Answer 270

Does not change in a group

Answer 271

Increase from top to bottom in a group

Answer 272

SP hybridization

Answer 273

Linear geometry

Answer 274

Dipole moment is zero

Answer 275

Octet rule

Answer 276

Electronegative character of elements

Answer 277

Electropositive character of elements

Answer 278

Pauli exclusion principle

Answer 279

Tetrahedral

Answer 280

Triangular planar

Answer 281

Hydrogen sulphide

Answer 282

Hydrogen fluoride

Answer 283

Trigonal bipyramidal

Answer 284

Fluorides is more electronegative

Answer 285

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer 286

NH₃ is pyramidal in shape while BF₃ is planar

Answer 287

Fluorides are more electronegative

Answer 288

Van der Waal’s forces

Answer 289

Dipole interaction

Answer 290

Hydrogen bond formation

Answer 291

Covalent attraction

Answer 292

Blue is absorbed more easily

Answer 293

Blue has more energy

Answer 294

Blue is darker colour

Answer 295

Blue has higher wavelength

Answer 296

Electro negativity

Answer 297

Electron affinity

Answer 298

None of these

Answer 299

Ionization energy

Answer 300

Trigonal bipyramidal

Answer 301

Tetrahedral

Answer 302

Square planar

Answer 303

X – radiation, visible, infrared, microwave

Answer 304

Radio, visible, infrared, ultraviolet

Answer 305

Visible, ultraviolet, infrared, gamma rays

Answer 306

Microwave, infrared, visible, ultraviolet

Answer 307

Equal to square

Answer 308

Depends on its wavelength

Answer 309

Depends on its source

Answer 310

Independent of its wavelength

Answer 311

They are larger than the atoms from which they were formed

Answer 312

They are also known as cations

Answer 313

They are formed when electros are formed from atoms

Answer 314

They are smaller than the atoms from which they were formed

Answer 315

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

Answer 316

Bonding molecular orbitals have low electron density between the two nuclei

Answer 317

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

Answer 318

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

Answer 319

Pauli’s exclusion principle

Answer 320

Hund’s rule

Answer 321

Aufbau principal

Answer 322

Ionic bond

Answer 323

Metallic bond

Answer 324

By losing three electrons

Answer 325

By gaining three electrons

Answer 326

By losing two electrons

Answer 327

By gaining two electrons

Answer 328

Atomic size

Answer 329

Electronegativity

Answer 330

Electron affinity

Answer 331

Ionization energy

Answer 332

A pair of electrons

Answer 333

A pair of valence electrons

Answer 334

A pair of valence electrons not involved in bonding

Answer 335

A pair of electrons involved in bonding

Answer 336

Excited state of neon

Answer 337

Ground state of fluorine atom

Answer 338

Excited state of O¯₂

Answer 339

Excited state of fluorine

Answer 340

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

Answer 341

It is always greater than 1st ionization energy

Answer 342

It is always less than 1st ionization energy

Answer 343

It is equal to the 1st ionization energy

Total Questions:	187
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Total Marks:	187
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