Chemistry Chemical Bonding Online Mcqs Test

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Question 1

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

Question 2

2. Inter molecular forces in solid hydrogen are

Answer

Van der Waal forces or London dispersion forces

Answer

All of these

Answer

Covalent forces

Answer

Hydrogen bonds

Question 3

3. If atomic numbers of nickel and copper are 28 and 29 respectively. Which of the following does the electronic configuration 1s² 2s² 2p⁶3s²3p⁶3d⁹ represent?

Question 4

4. The velocity of photon is

Answer

Depends on its source

Answer

Independent of its wavelength

Answer

Depends on its wavelength

Answer

Equal to square

Question 5

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

Question 6

6. If the radius of first Bohr orbit be ɜ₀, then the radius of third Bohr orbit would be

Answer

1/2 x ɜ₀

Question 7

7. 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 8

8. Molecular orbitals are filled according to

Answer

Aufbau principal

Answer

Hund’s rule

Answer

Pauli’s exclusion principle

Question 9

9. Unit of dipole moment is

Question 10

10. Nuclear radiation is emitted by those elements whose

Answer

Nuclei are unstable

Answer

Nuclei are stable

Answer

Molecules are stable

Answer

Molecules are unstable

Question 11

11. 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 12

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

Question 13

13. Which of the following molecule has Ā bond

Question 14

14. A molecule in which sp² hybrid orbitals are used by the central atom in forming covalent bonds is

Question 15

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

Answer

Electron affinity

Answer

Ionization energy

Answer

None of these

Answer

Electronegativity

Question 16

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

Question 17

17. Pick out the molecule which has zero dipole moment

Question 18

18. Which of the following has zero depolemoment?

Question 19

19. Choose the correct statement about 2nd ionization energy

Answer

It is always greater than 1st ionization energy

Answer

It is always less than 1st ionization energy

Answer

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

Answer

It is equal to the 1st ionization energy

Question 20

20. Force responsible to hold atoms together in a compound is called

Answer

All of above represent same entity

Answer

Attractive force

Answer

Interaction

Question 21

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

Answer

Lemon juice is dangerous for health

Answer

There may not be a possibility of chemical reaction

Answer

There may be a possibility of a chemical reaction

Answer

Water should be preferred over lemon Juice for drinking

Question 22

22. Which one of these is weakest?

Answer

Metallic bond

Answer

Ionic bond

Answer

Covalent bond

Answer

Van der Waal’s forces

Question 23

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

Answer

Tetrahedron

Question 24

24. Which of the following species is paramagnetic?

Question 25

25. Geometry of molecule will be pyramidal if the outer post shell of the central atom has

Answer

1 bond pair 3 lone pair

Answer

3 lone pair 1 bond pair

Answer

3 bond pair one lone pair

Answer

2 bond pair 2 lone pair

Question 26

26. The number and type of bonds between carbon atoms in calcium carbide are

Answer

One sigma, one pi

Answer

One sigma, two pi

Answer

Two sigma, two pi

Answer

Two sigma, one pi

Question 27

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

Answer

First increases then decreases

Answer

First decreases then increases

Question 28

28. According to VSPER theory, ammonia molecule has --------- shape

Answer

Triangular

Answer

Tetrahedral

Question 29

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

Answer

Ionization potential

Answer

Electron affinity

Answer

Activation energy

Answer

Electronegativity

Question 30

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

Question 31

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

Answer

Ground state of fluorine atom

Answer

Excited state of O¯₂

Answer

Excited state of neon

Answer

Excited state of fluorine

Question 32

32. 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 33

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

Answer

Microwave, infrared, visible, ultraviolet

Answer

Visible, ultraviolet, infrared, gamma rays

Answer

X – radiation, visible, infrared, microwave

Answer

Radio, visible, infrared, ultraviolet

Question 34

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

Question 35

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

Question 36

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

Answer

Electron affinity

Answer

Atomic size

Answer

Electronegativity

Answer

Ionization energy

Question 37

37. The carbon atoms in calcium carbide are held by

Answer

2 sigma bonds

Answer

2π and one σ bond

Answer

2 covalent, one co-ordinate bond

Answer

Ionic bonds

Question 38

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

Question 39

39. Ionic radius in a period from left to right

Answer

First decreases then increases

Answer

First increases then decreases

Question 40

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

Answer

Gamma rays

Answer

Shorter wavelength

Answer

X-rays not produced

Answer

Larger wavelength

Question 41

41. Which of the solid does not contain covalent bond

Question 42

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

Question 43

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

Answer

Planar triangle

Answer

Square planar

Answer

Tetrahedral

Question 44

44. 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 45

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

Answer

The attractive forces dominate the repulsive forces

Answer

The repulsive force dominate the attractive forces

Answer

They energy of atoms increases

Answer

The two atoms start ionization

Question 46

46. Which of the following molecules has no net dipole moment?

Question 47

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

Question 48

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

Question 49

49. ____________ has their outermost shell complete in atomic form

Answer

Coinage metals

Answer

Noble gases

Answer

Alkali metals

Answer

Gun metals

Question 50

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

Answer

Bonding molecular orbitals have low electron density between the two nuclei

Answer

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

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 51

51. A lone pair of electrons in an atom implies

Answer

A pair of valence electrons

Answer

A pair of valence electrons not involved in bonding

Answer

A pair of electrons

Answer

A pair of electrons involved in bonding

Question 52

52. Al become isoelectronic with Ne

Answer

By gaining three electrons

Answer

By losing two electrons

Answer

By losing three electrons

Answer

By gaining two electrons

Question 53

53. Effective magnetic moment of Sc³ ion is

Question 54

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

Question 55

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

Question 56

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

Answer

Ionic and nonpolar hydrogen bonds

Answer

Nonpolar covalent bonds only

Answer

Hydrogen bonds only

Answer

Both polar covalent and hydrogen bonds

Question 57

57. Energy of an atom in a compound is

Answer

Lesser than individual

Answer

Impossible to predict

Answer

Higher than individual

Question 58

58. 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

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

Answer

It has high heat of dissociation

Question 59

59. 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 60

60. 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 61

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

Question 62

62. 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 63

63. Number of π-bonds in naphthalene is

Question 64

64. 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

8 in bonding molecular orbitals, 4 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

Answer 121

1.7588 x 10¹¹

Answer 122

6.02 x 10²³

Answer 123

9.1095 x 10¯³¹

Answer 124

1.7588 x 10²⁰

Answer 125

Planar triangle

Answer 126

Distorted tetrahedral

Answer 127

Octahedral

Answer 128

Crystallization

Answer 129

Colour spectrum

Answer 130

Distillation

Answer 131

Vaporization

Answer 132

Photosensitivity of sodium

Answer 133

Sublimation of metallic sodium to give yellow vapour

Answer 134

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

Answer 135

Low ionization energy of sodium

Answer 136

None of these

Answer 137

Electro negativity

Answer 138

Electron affinity

Answer 139

Ionization energy

Answer 140

Square planner

Answer 141

Octahedral

Answer 142

Trigonal bipyramidal

Answer 143

Triangular

Answer 144

Tetrahedral

Answer 145

Square planner

Answer 146

Triangular

Answer 147

Generally increases from left to right in a period

Answer 148

Increase from top to bottom in a group

Answer 149

Does not change in a group

Answer 150

Does not change in a period

Answer 151

Blue has higher wavelength

Answer 152

Blue is darker colour

Answer 153

Blue is absorbed more easily

Answer 154

Blue has more energy

Answer 155

Hydrogen sulphide

Answer 156

Hydrogen fluoride

Answer 157

Remains constant

Answer 158

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

Answer 159

Linear geometry

Answer 160

Dipole moment is zero

Answer 161

SP hybridization

Answer 162

Metallic bond

Answer 163

Ionic bond

Answer 164

5.316 x 10¯²³ g

Answer 165

5.316 x 10¯²³ g

Answer 166

2.657 x 10¯²³ g

Answer 167

Impossible to predict

Answer 168

Fourth Bohr orbit to the first Bohr orbit

Answer 169

Fifth Bohr orbit to the second Bohr orbit

Answer 170

Sixth Bohr orbit to the third Bohr orbit

Answer 171

Seventh Bohr orbit to the third Bohr orbit

Answer 172

Cannot be determined

Answer 173

Both are equal

Answer 174

All of these

Answer 175

The nature of residual gas

Answer 176

The nature of discharge tube

Answer 177

The nature of electrode

Answer 178

Hybrid and un hybrid orbitals

Answer 179

Un-hybrid orbitals

Answer 180

Hybrid orbitals

Answer 181

Atomic orbital and hybrid orbital

Answer 182

sp- hybridized carbon

Answer 183

sp²- hybridized carbon

Answer 184

sp³-hybridized carbon

Answer 185

always same irrespective of its hybrid state

Answer 186

Water has higher molecular weight

Answer 187

Water molecules associate through hydrogen bonding

Answer 188

Hydrogen sulphide is a weak acid

Answer 189

Sulphure has high electronegativity than oxygen

Answer 190

Move with speed as that of light

Answer 191

Can be deflected by magnetic fields

Answer 192

Charged particles

Answer 193

A stream of electrons

Answer 194

Lesser then 1.7

Answer 195

Equal to 1.7

Answer 196

Greater than 1.7

Answer 197

No specificity exist

Answer 198

Ejection of some potassium atoms occurs

Answer 199

There is no effect

Answer 200

The absorption of electrons takes place

Answer 201

Ejection of electrons takes place

Answer 202

Variable trend

Answer 203

H – NH₂

Answer 204

None of these

Answer 205

High, very negative

Answer 206

Low very negative

Answer 207

Low, positive or slightly negative

Answer 208

Octet rule

Answer 209

Electronegative character of elements

Answer 210

Electropositive character of elements

Answer 211

Pauli exclusion principle

Answer 212

Eight σ and eight π

Answer 213

Five π and nine σ

Answer 214

Nine σ and nine π

Answer 215

Nine σ and seven π

Answer 216

Van der Waal’s force

Answer 217

Dispersion force

Answer 218

London force

Answer 219

Chemical bond

Answer 220

Bond length in NO⁺ is greater than in NO

Answer 221

Bond length is unpredictable

Answer 222

Bond length in NO⁺ is equal to that in NO

Answer 223

Bond length in NO is greater than in NO⁺

Answer 224

Dipole-dipole interaction

Answer 225

Dispersion force

Answer 226

Ion-dipole interaction

Answer 227

Square planar

Answer 228

Tetrahedral

Answer 229

Trigonal bipyramidal

Answer 230

Remain same

Answer 231

Lone pair – lone pair repulsion only

Answer 232

Lone pair – bond pair repulsion only

Answer 233

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

Answer 234

Bond pair – bond pair repulsion only

Answer 235

Covalent attraction

Answer 236

Van der Waal’s forces

Answer 237

Dipole interaction

Answer 238

Hydrogen bond formation

Answer 239

n = 1, l = 2

Answer 240

n = 2, l = 1

Answer 241

n = 2, l = 0

Answer 242

n = 1, l = 0

Answer 243

The axial p-p overlap

Answer 244

The sidewise p-p overlap

Answer 245

The overlap of two sp² hybrid orbitals

Answer 246

The axial s-p overlap

Answer 247

Quarternization of energy of electrons

Answer 248

Plank’s quantum theory

Answer 249

Heisenberg’s uncertainty principle

Answer 250

Quarternization of angular members

Answer 251

Depends on the gas used in the discharge tube

Answer 252

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

Answer 253

Depends on the pressure in the discharge tube

Answer 254

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

Answer 255

4 electrons

Answer 256

2 electrons

Answer 257

6 electrons

Answer 258

1 electron

Answer 259

Electrovalent bond

Answer 260

Covalent bond

Answer 261

Double bond

Answer 262

Co-ordinate bond

Answer 263

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

Answer 264

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

Answer 265

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

Answer 266

Each bonding molecular orbital can accommodate only one electron

Answer 267

Concentrated acids

Answer 268

Non-polar solvents

Answer 269

All solvents

Answer 270

Polar solvents

Answer 271

Multiplication of atomic orbitals

Answer 272

Subtraction of atomic orbitals

Answer 273

Addition of atomic orbitals

Answer 274

None of these

Answer 275

10.2340178

Answer 276

4, 4, 0, ½

Answer 277

4, 0, 0, ½

Answer 278

4, 1, 1, ½

Answer 279

4, 1, 0, ½

Answer 280

Orbital overlap will not occur

Answer 281

None of these

Answer 282

Bonding will not occur

Answer 283

Both A and B are correct

Answer 284

First decreases then increases

Answer 285

Bond order of 2.5

Answer 286

Stability lower then O₂

Answer 287

Diamagnetic character

Answer 288

Three unpaired electrons

Answer 289

One unpaired electron

Answer 290

No unpaired electron

Answer 291

None of these

Answer 292

Two unpaired electron

Answer 293

Carbon tetrachloride

Answer 294

Carbon dioxide

Answer 295

6.02 x 10¹⁶ J/mol

Answer 296

6.02 x 10²³ J/mol

Answer 297

10¯⁷ J/mol

Answer 298

Octahedral

Answer 299

Tetrahedral

Answer 300

Trigonal bipyramidal

Answer 301

Triangular planar

Answer 302

Triangular pyramidal

Answer 303

Tetrahedral

Answer 304

Triangular bipyramidal

Answer 305

Two sigma bonds and one pi-bond

Answer 306

Three sigma bonds

Answer 307

Three pi-bonds

Answer 308

One sigma bond and two pi-bonds

Answer 309

They are larger than the atoms from which they were formed

Answer 310

They are smaller than the atoms from which they were formed

Answer 311

They are formed when electros are formed from atoms

Answer 312

They are also known as cations

Answer 313

6.63 x 10¯³⁵ m

Answer 314

6.63 x 10¯³³ m

Answer 315

6.63 x 10¯³⁴ m

Answer 316

6.65 x 10¯³⁵ m

Answer 317

NH₃ is pyramidal in shape while BF₃ is planar

Answer 318

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer 319

Fluorides are more electronegative

Answer 320

Fluorides is more electronegative

Answer 321

Octet is complete

Answer 322

No such acids exist

Answer 323

Electron deficient

Answer 324

Electron rich

Answer 325

sp² hybrid orbitals

Answer 326

sp³ hybrid orbitals

Answer 327

p orbitals

Answer 328

s orbitals

Answer 329

Liquid NH3

Answer 330

Liquid HCl

Answer 331

Tetrahedral

Answer 332

Triangular planar

Answer 333

Trigonal bipyramidal

Answer 334

Triangular

Answer 335

Square planner

Answer 336

Tetrahedral

Answer 337

Square planar

Answer 338

Octahedral

Answer 339

Trigonal bipyramidal

Answer 340

Electron affinity

Answer 341

None of these

Answer 342

Ionization energy

Answer 343

Electro negativity

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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