Chemistry Chemical Bonding Online Mcqs Test

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Question 1

1. Fluorine molecule is formed by

Answer

The overlap of two sp² hybrid orbitals

Answer

The axial p-p overlap

Answer

The sidewise p-p overlap

Answer

The axial s-p overlap

Question 2

2. Which of the following molecules does not have a net dipole moment?

Question 3

3. The structure of ICl₂¯ is

Answer

Octahedral

Answer

Trigonal bipyramidal

Answer

Square planar

Question 4

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

Question 5

5. Which of the following will have highest value of electron affinity

Question 6

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

Question 7

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

Question 8

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

Answer

Electropositive character of elements

Answer

Pauli exclusion principle

Answer

Octet rule

Answer

Electronegative character of elements

Question 9

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

Question 10

10. When a double bond is formed between two atoms, one of the bonds is a sigma bond and the other is a pi bond. The pi bond is created by the overlap of……

Answer

sp² hybrid orbitals

Answer

p orbitals

Answer

sp³ hybrid orbitals

Answer

s orbitals

Question 11

11. Which of the following has unchanged valency?

Question 12

12. The number of significant figures in 0.00200 is

Question 13

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

Answer

Remains constant

Answer

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

Question 14

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

Answer

Trigonal bipyramidal

Question 15

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

Question 16

16. Which of the following has zero depolemoment?

Question 17

17. Which one of the following pairs of atoms is most likely to form an ionic bond?

Question 18

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

Answer

Microwave, infrared, visible, ultraviolet

Answer

X – radiation, visible, infrared, microwave

Answer

Radio, visible, infrared, ultraviolet

Answer

Visible, ultraviolet, infrared, gamma rays

Question 19

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

Answer

Nine σ and seven π

Answer

Five π and nine σ

Answer

Eight σ and eight π

Answer

Nine σ and nine π

Question 20

20. 1 erg of energy corresponds to

Answer

6.02 x 10¹⁶ J/mol

Answer

10¯⁷ J/mol

Answer

6.02 x 10²³ J/mol

Question 21

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

Answer

Bond pair – bond pair repulsion only

Answer

Lone pair – lone pair repulsion only

Answer

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

Answer

Lone pair – bond pair repulsion only

Question 22

22. Elements with ________ first ionization energies and ________ electron affinities generally from cations. Choose the correct point

Answer

None of these

Answer

Low very negative

Answer

Low, positive or slightly negative

Answer

High, very negative

Question 23

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

Answer

A stream of electrons

Answer

Can be deflected by magnetic fields

Answer

Move with speed as that of light

Answer

Charged particles

Question 24

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

Answer

Two sigma, one pi

Answer

Two sigma, two pi

Answer

One sigma, one pi

Answer

One sigma, two pi

Question 25

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

Answer

Liquid HCl

Answer

Liquid NH3

Question 26

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

Question 27

27. 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 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 28

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

Answer

Electronegativity

Answer

Atomic size

Answer

Electron affinity

Answer

Ionization energy

Question 29

29. The shape of H₃O⁺ is

Answer

Tetrahedral

Answer

Triangular planar

Question 30

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

Answer

Variable trend

Question 31

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

Answer

First increases then decreases

Answer

First decreases then increases

Question 32

32. 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 33

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

Question 34

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

Answer

Remain same

Question 35

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

Answer

Three unpaired electrons

Answer

Diamagnetic character

Answer

Bond order of 2.5

Answer

Stability lower then O₂

Question 36

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

Question 37

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

Answer

Low ionization energy of sodium

Answer

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

Answer

Photosensitivity of sodium

Answer

Sublimation of metallic sodium to give yellow vapour

Question 38

38. When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?

Answer

Covalent attraction

Answer

Van der Waal’s forces

Answer

Hydrogen bond formation

Answer

Dipole interaction

Question 39

39. Anti-bonding MO is formed by

Answer

None of these

Answer

Subtraction of atomic orbitals

Answer

Multiplication of atomic orbitals

Answer

Addition of atomic orbitals

Question 40

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

Question 41

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

Answer

Hydrogen sulphide is a weak acid

Answer

Sulphure has high electronegativity than oxygen

Answer

Water has higher molecular weight

Answer

Water molecules associate through hydrogen bonding

Question 42

42. The third line of the Balmer series, in the emission spectrum of the hydrogen atom, is due to the transition from the

Answer

Fifth Bohr orbit to the second Bohr orbit

Answer

Seventh Bohr orbit to the third Bohr orbit

Answer

Fourth Bohr orbit to the first Bohr orbit

Answer

Sixth Bohr orbit to the third Bohr orbit

Question 43

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

Answer

Tetrahedron

Question 44

44. Which of the bonds, shown by the ___________ has the greatest polarity?

Answer

H – NH₂

Question 45

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

Answer

Attractive force

Answer

Interaction

Answer

All of above represent same entity

Question 46

46. The value of e/m ratio of electron is:

Answer

1.7588 x 10²⁰

Answer

6.02 x 10²³

Answer

1.7588 x 10¹¹

Answer

9.1095 x 10¯³¹

Question 47

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

Question 48

48. Inter molecular forces in solid hydrogen are

Answer

All of these

Answer

Covalent forces

Answer

Hydrogen bonds

Answer

Van der Waal forces or London dispersion forces

Question 49

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

Answer

None of these

Answer

Ionization energy

Answer

Electron affinity

Answer

Electronegativity

Question 50

50. Bond order for N2 molecule is

Question 51

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

Question 52

52. Geometry of simple molecule having sp3 hybrid orbital is

Answer

Square planner

Answer

Triangular

Answer

Tetrahedral

Question 53

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

Question 54

54. In O2 each oxygen atom is hybridized

Question 55

55. 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 56

56. Which of the following is not isoelectronic?

Question 57

57. Al become isoelectronic with Ne

Answer

By gaining three electrons

Answer

By gaining two electrons

Answer

By losing two electrons

Answer

By losing three electrons

Question 58

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

Question 59

59. Bond angle in water is

Question 60

60. Molecular orbitals are filled according to

Answer

Hund’s rule

Answer

Pauli’s exclusion principle

Answer

Aufbau principal

Question 61

61. 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 62

62. 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

6.65 x 10¯³⁵ m

Answer

6.63 x 10¯³³ m

Answer

6.63 x 10¯³⁵ m

Question 63

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

Question 64

64. 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

Answer 124

Both are equal

Answer 125

Cannot be determined

Answer 126

Excited state of fluorine

Answer 127

Excited state of neon

Answer 128

Ground state of fluorine atom

Answer 129

Excited state of O¯₂

Answer 130

Impossible to predict

Answer 131

Lesser than individual

Answer 132

Higher than individual

Answer 133

First increases then decreases

Answer 134

First decreases then increases

Answer 135

Square planar

Answer 136

Tetrahedral

Answer 137

Planar triangle

Answer 138

Increase from top to bottom in a group

Answer 139

Generally increases from left to right in a period

Answer 140

Does not change in a group

Answer 141

Does not change in a period

Answer 142

Nuclei are stable

Answer 143

Molecules are unstable

Answer 144

Molecules are stable

Answer 145

Nuclei are unstable

Answer 146

They do not react with one another

Answer 147

They are mono atomic gases

Answer 148

They have completely filled s and p orbitals

Answer 149

They have high ionization energies

Answer 150

Triangular planar

Answer 151

Triangular pyramidal

Answer 152

Triangular bipyramidal

Answer 153

Tetrahedral

Answer 154

1/2 x ɜ₀

Answer 155

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

Answer 156

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

Answer 157

Bonding molecular orbitals have low electron density between the two nuclei

Answer 158

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

Answer 159

Ionic bond

Answer 160

Metallic bond

Answer 161

They are also known as cations

Answer 162

They are formed when electros are formed from atoms

Answer 163

They are larger than the atoms from which they were formed

Answer 164

They are smaller than the atoms from which they were formed

Answer 165

Covalent bond

Answer 166

Electrovalent bond

Answer 167

Co-ordinate bond

Answer 168

Double bond

Answer 169

4, 4, 0, ½

Answer 170

4, 1, 0, ½

Answer 171

4, 0, 0, ½

Answer 172

4, 1, 1, ½

Answer 173

Hydrogen sulphide

Answer 174

Hydrogen fluoride

Answer 175

First decreases then increases

Answer 176

Square planner

Answer 177

Tetrahedral

Answer 178

Triangular

Answer 179

The two atoms start ionization

Answer 180

The attractive forces dominate the repulsive forces

Answer 181

The repulsive force dominate the attractive forces

Answer 182

They energy of atoms increases

Answer 183

Both A and B are correct

Answer 184

Bonding will not occur

Answer 185

None of these

Answer 186

Orbital overlap will not occur

Answer 187

Dispersion force

Answer 188

Ion-dipole interaction

Answer 189

Dipole-dipole interaction

Answer 190

Atomic orbital and hybrid orbital

Answer 191

Un-hybrid orbitals

Answer 192

Hybrid and un hybrid orbitals

Answer 193

Hybrid orbitals

Answer 194

n = 2, l = 0

Answer 195

n = 1, l = 2

Answer 196

n = 1, l = 0

Answer 197

n = 2, l = 1

Answer 198

Gamma rays

Answer 199

X-rays not produced

Answer 200

Larger wavelength

Answer 201

Shorter wavelength

Answer 202

Bond length in NO⁺ is greater than in NO

Answer 203

Bond length in NO⁺ is equal to that in NO

Answer 204

Bond length in NO is greater than in NO⁺

Answer 205

Bond length is unpredictable

Answer 206

There may be a possibility of a chemical reaction

Answer 207

Lemon juice is dangerous for health

Answer 208

Water should be preferred over lemon Juice for drinking

Answer 209

There may not be a possibility of chemical reaction

Answer 210

5.316 x 10¯²³ g

Answer 211

2.657 x 10¯²³ g

Answer 212

5.316 x 10¯²³ g

Answer 213

Ionic bonds

Answer 214

2 sigma bonds

Answer 215

2π and one σ bond

Answer 216

2 covalent, one co-ordinate bond

Answer 217

Tetrahedral

Answer 218

Trigonal bipyramidal

Answer 219

Square planar

Answer 220

Crystallization

Answer 221

Distillation

Answer 222

Vaporization

Answer 223

Colour spectrum

Answer 224

Blue has more energy

Answer 225

Blue has higher wavelength

Answer 226

Blue is absorbed more easily

Answer 227

Blue is darker colour

Answer 228

Covalent bond

Answer 229

Metallic bond

Answer 230

Van der Waal’s forces

Answer 231

Ionic bond

Answer 232

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer 233

NH₃ is pyramidal in shape while BF₃ is planar

Answer 234

Fluorides are more electronegative

Answer 235

Fluorides is more electronegative

Answer 236

Two unpaired electron

Answer 237

None of these

Answer 238

One unpaired electron

Answer 239

No unpaired electron

Answer 240

10.2340178

Answer 241

Distorted tetrahedral

Answer 242

Planar triangle

Answer 243

Octahedral

Answer 244

1 electron

Answer 245

4 electrons

Answer 246

2 electrons

Answer 247

6 electrons

Answer 248

Coinage metals

Answer 249

Gun metals

Answer 250

Alkali metals

Answer 251

Noble gases

Answer 252

Greater than 1.7

Answer 253

No specificity exist

Answer 254

Lesser then 1.7

Answer 255

Equal to 1.7

Answer 256

Tetrahedral

Answer 257

Trigonal bipyramidal

Answer 258

Octahedral

Answer 259

The nature of residual gas

Answer 260

The nature of electrode

Answer 261

The nature of discharge tube

Answer 262

All of these

Answer 263

Octahedral

Answer 264

Triangular

Answer 265

Square planner

Answer 266

Trigonal bipyramidal

Answer 267

All p-orbitals are involved

Answer 268

One p-orbital is involved

Answer 269

Four p-orbitals are involved

Answer 270

One s and 3 p-orbitals are involved

Answer 271

Impossible to predict

Answer 272

Ionic and nonpolar hydrogen bonds

Answer 273

Hydrogen bonds only

Answer 274

Nonpolar covalent bonds only

Answer 275

Both polar covalent and hydrogen bonds

Answer 276

One sigma bond and two pi-bonds

Answer 277

Three pi-bonds

Answer 278

Three sigma bonds

Answer 279

Two sigma bonds and one pi-bond

Answer 280

Carbon dioxide

Answer 281

Carbon tetrachloride

Answer 282

Plank’s quantum theory

Answer 283

Quarternization of energy of electrons

Answer 284

Heisenberg’s uncertainty principle

Answer 285

Quarternization of angular members

Answer 286

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

Answer 287

Each bonding molecular orbital can accommodate only one electron

Answer 288

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

Answer 289

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

Answer 290

Non-polar solvents

Answer 291

Concentrated acids

Answer 292

All solvents

Answer 293

Polar solvents

Answer 294

1 bond pair 3 lone pair

Answer 295

2 bond pair 2 lone pair

Answer 296

3 lone pair 1 bond pair

Answer 297

3 bond pair one lone pair

Answer 298

Electron rich

Answer 299

Electron deficient

Answer 300

No such acids exist

Answer 301

Octet is complete

Answer 302

Chemical bond

Answer 303

Van der Waal’s force

Answer 304

London force

Answer 305

Dispersion force

Answer 306

Tetrahedral

Answer 307

Triangular

Answer 308

It is equal to the 1st ionization energy

Answer 309

It is always greater than 1st ionization energy

Answer 310

It is always less than 1st ionization energy

Answer 311

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

Answer 312

Ejection of electrons takes place

Answer 313

There is no effect

Answer 314

Ejection of some potassium atoms occurs

Answer 315

The absorption of electrons takes place

Answer 316

A pair of valence electrons

Answer 317

A pair of electrons involved in bonding

Answer 318

A pair of valence electrons not involved in bonding

Answer 319

A pair of electrons

Answer 320

Depends on its source

Answer 321

Depends on its wavelength

Answer 322

Equal to square

Answer 323

Independent of its wavelength

Answer 324

None of these

Answer 325

Ionization energy

Answer 326

Electro negativity

Answer 327

Electron affinity

Answer 328

Ionization potential

Answer 329

Electron affinity

Answer 330

Activation energy

Answer 331

Electronegativity

Answer 332

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

Answer 333

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

Answer 334

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

Answer 335

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

Answer 336

sp³-hybridized carbon

Answer 337

always same irrespective of its hybrid state

Answer 338

sp²- hybridized carbon

Answer 339

sp- hybridized carbon

Answer 340

Ionization energy

Answer 341

None of these

Answer 342

Electron affinity

Answer 343

Electro negativity

Total Questions:	187
Time Allowed:	60 Minutes
Total Marks:	187
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