Chemistry Chemical Bonding Online Mcqs Test

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Question 1

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

Answer

One sigma, one pi

Answer

Two sigma, two pi

Answer

Two sigma, one pi

Answer

One sigma, two pi

Question 2

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

Answer

Triangular

Answer

Tetrahedral

Question 3

3. Quantum umber values for 2p orbitals are

Answer

n = 1, l = 0

Answer

n = 1, l = 2

Answer

n = 2, l = 1

Answer

n = 2, l = 0

Question 4

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

Question 5

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

Question 6

6. 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 7

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

Answer

Remain same

Question 8

8. ____________ has their outermost shell complete in atomic form

Answer

Coinage metals

Answer

Noble gases

Answer

Gun metals

Answer

Alkali metals

Question 9

9. Anti-bonding MO is formed by

Answer

Subtraction of atomic orbitals

Answer

Addition of atomic orbitals

Answer

None of these

Answer

Multiplication of atomic orbitals

Question 10

10. 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 11

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

Question 12

12. Al become isoelectronic with Ne

Answer

By gaining two electrons

Answer

By gaining three electrons

Answer

By losing two electrons

Answer

By losing three electrons

Question 13

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

Answer

H – NH₂

Question 14

14. Lewis acids are

Answer

Electron deficient

Answer

Electron rich

Answer

Octet is complete

Answer

No such acids exist

Question 15

15. Which of the following molecule has Ā bond

Question 16

16. 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 17

17. 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 18

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

Answer

Trigonal bipyramidal

Question 19

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

Answer

Impossible to predict

Question 20

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

Answer

Tetrahedral

Answer

Planar triangle

Answer

Square planar

Question 21

21. Unit of dipole moment is

Question 22

22. Pick out the molecule which has zero dipole moment

Question 23

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

Answer

Attractive force

Answer

All of above represent same entity

Answer

Interaction

Question 24

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

Question 25

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

Answer

Nonpolar covalent bonds only

Answer

Both polar covalent and hydrogen bonds

Answer

Ionic and nonpolar hydrogen bonds

Answer

Hydrogen bonds only

Question 26

26. If the value of principal quantum number is 3, the total possible values for magnetic quantum number will be

Question 27

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

Question 28

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

Answer

Variable trend

Question 29

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

Question 30

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

Question 31

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

Question 32

32. The shape of H₃O⁺ is

Answer

Tetrahedral

Answer

Triangular planar

Question 33

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

Question 34

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

Question 35

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

Question 36

36. 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 37

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

Answer

First increases then decreases

Answer

First decreases then increases

Question 38

38. Choose the correct statement

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

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

Answer

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

Question 39

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

Answer

Sulphure has high electronegativity than oxygen

Answer

Hydrogen sulphide is a weak acid

Answer

Water molecules associate through hydrogen bonding

Answer

Water has higher molecular weight

Question 40

40. H-bonding is not present in

Answer

Hydrogen sulphide

Answer

Hydrogen fluoride

Question 41

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

Question 42

42. 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 43

43. Number of sigma bonds in P₄O₁₀ is

Question 44

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

Question 45

45. The shape of the molecule SF₂Cl₂ is

Answer

Tetrahedral

Answer

Octahedral

Answer

Trigonal bipyramidal

Question 46

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

Answer

They are smaller than the atoms from which they were formed

Answer

They are also known as cations

Answer

They are larger than the atoms from which they were formed

Answer

They are formed when electros are formed from atoms

Question 47

47. Which of these molecules require more bond energy?

Question 48

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

Answer

Fluorides is more electronegative

Answer

Boron trifluoride is pyramidal in shape while NH₃ is planar

Answer

NH₃ is pyramidal in shape while BF₃ is planar

Answer

Fluorides are more electronegative

Question 49

49. Which one of these is weakest?

Answer

Van der Waal’s forces

Answer

Covalent bond

Answer

Ionic bond

Answer

Metallic bond

Question 50

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

Question 51

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

Question 52

52. 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

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

Answer

Depends on the pressure in the discharge tube

Answer

Depends on the gas used in the discharge tube

Question 53

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

Question 54

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

Question 55

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

Answer

Electron affinity

Answer

None of these

Answer

Electro negativity

Answer

Ionization energy

Question 56

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

Answer

Bonding will not occur

Answer

None of these

Answer

Both A and B are correct

Answer

Orbital overlap will not occur

Question 57

57. The number of significant figures in 0.00200 is

Question 58

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

Question 59

59. Maximum hydrogen bonds in water are,

Question 60

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

Question 61

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

Answer

Octahedral

Answer

Distorted tetrahedral

Answer

Planar triangle

Question 62

62. Energy of an atom in a compound is

Answer

Lesser than individual

Answer

Higher than individual

Answer

Impossible to predict

Question 63

63. Pi bonds are produced by overlapping of

Answer

Un-hybrid orbitals

Answer

Hybrid orbitals

Answer

Hybrid and un hybrid orbitals

Answer

Atomic orbital and hybrid orbital

Question 64

64. 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

Answer 100

sp³ hybrid orbitals

Answer 101

sp² hybrid orbitals

Answer 102

p orbitals

Answer 103

s orbitals

Answer 104

10¯⁷ J/mol

Answer 105

6.02 x 10¹⁶ J/mol

Answer 106

6.02 x 10²³ J/mol

Answer 107

Chemical bond

Answer 108

Dispersion force

Answer 109

Van der Waal’s force

Answer 110

London force

Answer 111

6.65 x 10¯³⁵ m

Answer 112

6.63 x 10¯³⁴ m

Answer 113

6.63 x 10¯³⁵ m

Answer 114

6.63 x 10¯³³ m

Answer 115

Atomic size

Answer 116

Electron affinity

Answer 117

Ionization energy

Answer 118

Electronegativity

Answer 119

Bond order of 2.5

Answer 120

Three unpaired electrons

Answer 121

Diamagnetic character

Answer 122

Stability lower then O₂

Answer 123

Ionic bond

Answer 124

Metallic bond

Answer 125

Molecules are stable

Answer 126

Nuclei are stable

Answer 127

Molecules are unstable

Answer 128

Nuclei are unstable

Answer 129

Carbon dioxide

Answer 130

Carbon tetrachloride

Answer 131

Octahedral

Answer 132

Triangular

Answer 133

Square planner

Answer 134

Trigonal bipyramidal

Answer 135

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

Answer 136

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

Answer 137

It has high heat of dissociation

Answer 138

It has high electronegativity

Answer 139

Electronegative character of elements

Answer 140

Electropositive character of elements

Answer 141

Pauli exclusion principle

Answer 142

Octet rule

Answer 143

Aufbau principal

Answer 144

Hund’s rule

Answer 145

Pauli’s exclusion principle

Answer 146

Electrovalent bond

Answer 147

Double bond

Answer 148

Co-ordinate bond

Answer 149

Covalent bond

Answer 150

Quarternization of angular members

Answer 151

Heisenberg’s uncertainty principle

Answer 152

Quarternization of energy of electrons

Answer 153

Plank’s quantum theory

Answer 154

Covalent attraction

Answer 155

Hydrogen bond formation

Answer 156

Dipole interaction

Answer 157

Van der Waal’s forces

Answer 158

Three sigma bonds

Answer 159

Two sigma bonds and one pi-bond

Answer 160

Three pi-bonds

Answer 161

One sigma bond and two pi-bonds

Answer 162

Triangular

Answer 163

Square planner

Answer 164

Tetrahedral

Answer 165

Nine σ and seven π

Answer 166

Nine σ and nine π

Answer 167

Five π and nine σ

Answer 168

Eight σ and eight π

Answer 169

The axial s-p overlap

Answer 170

The axial p-p overlap

Answer 171

The sidewise p-p overlap

Answer 172

The overlap of two sp² hybrid orbitals

Answer 173

None of these

Answer 174

Low very negative

Answer 175

Low, positive or slightly negative

Answer 176

High, very negative

Answer 177

The attractive forces dominate the repulsive forces

Answer 178

The two atoms start ionization

Answer 179

The repulsive force dominate the attractive forces

Answer 180

They energy of atoms increases

Answer 181

4, 1, 1, ½

Answer 182

4, 1, 0, ½

Answer 183

4, 4, 0, ½

Answer 184

4, 0, 0, ½

Answer 185

Blue is darker colour

Answer 186

Blue has more energy

Answer 187

Blue is absorbed more easily

Answer 188

Blue has higher wavelength

Answer 189

4 electrons

Answer 190

1 electron

Answer 191

2 electrons

Answer 192

6 electrons

Answer 193

3 lone pair 1 bond pair

Answer 194

3 bond pair one lone pair

Answer 195

2 bond pair 2 lone pair

Answer 196

1 bond pair 3 lone pair

Answer 197

They have high ionization energies

Answer 198

They do not react with one another

Answer 199

They are mono atomic gases

Answer 200

They have completely filled s and p orbitals

Answer 201

Vaporization

Answer 202

Crystallization

Answer 203

Distillation

Answer 204

Colour spectrum

Answer 205

First decreases then increases

Answer 206

First increases then decreases

Answer 207

Charged particles

Answer 208

A stream of electrons

Answer 209

Can be deflected by magnetic fields

Answer 210

Move with speed as that of light

Answer 211

There is no effect

Answer 212

Ejection of electrons takes place

Answer 213

Ejection of some potassium atoms occurs

Answer 214

The absorption of electrons takes place

Answer 215

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

Answer 216

Lone pair – lone pair repulsion only

Answer 217

Lone pair – bond pair repulsion only

Answer 218

Bond pair – bond pair repulsion only

Answer 219

Triangular planar

Answer 220

Triangular pyramidal

Answer 221

Tetrahedral

Answer 222

Triangular bipyramidal

Answer 223

Ionization potential

Answer 224

Electronegativity

Answer 225

Electron affinity

Answer 226

Activation energy

Answer 227

Electro negativity

Answer 228

None of these

Answer 229

Electron affinity

Answer 230

Ionization energy

Answer 231

Ion-dipole interaction

Answer 232

Dipole-dipole interaction

Answer 233

Dispersion force

Answer 234

Visible, ultraviolet, infrared, gamma rays

Answer 235

Microwave, infrared, visible, ultraviolet

Answer 236

X – radiation, visible, infrared, microwave

Answer 237

Radio, visible, infrared, ultraviolet

Answer 238

Shorter wavelength

Answer 239

Gamma rays

Answer 240

Larger wavelength

Answer 241

X-rays not produced

Answer 242

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

Answer 243

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

Answer 244

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

Answer 245

Bonding molecular orbitals have low electron density between the two nuclei

Answer 246

A pair of electrons involved in bonding

Answer 247

A pair of valence electrons

Answer 248

A pair of valence electrons not involved in bonding

Answer 249

A pair of electrons

Answer 250

5.316 x 10¯²³ g

Answer 251

5.316 x 10¯²³ g

Answer 252

2.657 x 10¯²³ g

Answer 253

Polar solvents

Answer 254

Non-polar solvents

Answer 255

All solvents

Answer 256

Concentrated acids

Answer 257

First decreases then increases

Answer 258

All of these

Answer 259

The nature of discharge tube

Answer 260

The nature of electrode

Answer 261

The nature of residual gas

Answer 262

1/2 x ɜ₀

Answer 263

It is equal to the 1st ionization energy

Answer 264

It is always less than 1st ionization energy

Answer 265

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

Answer 266

It is always greater than 1st ionization energy

Answer 267

Liquid NH3

Answer 268

Liquid HCl

Answer 269

All of these

Answer 270

Covalent forces

Answer 271

Van der Waal forces or London dispersion forces

Answer 272

Hydrogen bonds

Answer 273

Ionization energy

Answer 274

Electronegativity

Answer 275

Electron affinity

Answer 276

None of these

Answer 277

Triangular

Answer 278

Tetrahedral

Answer 279

Square planner

Answer 280

9.1095 x 10¯³¹

Answer 281

1.7588 x 10²⁰

Answer 282

6.02 x 10²³

Answer 283

1.7588 x 10¹¹

Answer 284

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

Answer 285

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

Answer 286

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

Answer 287

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

Answer 288

2 sigma bonds

Answer 289

2 covalent, one co-ordinate bond

Answer 290

2π and one σ bond

Answer 291

Ionic bonds

Answer 292

Ground state of fluorine atom

Answer 293

Excited state of neon

Answer 294

Excited state of O¯₂

Answer 295

Excited state of fluorine

Answer 296

Both are equal

Answer 297

Cannot be determined

Answer 298

Square planar

Answer 299

Tetrahedral

Answer 300

Trigonal bipyramidal

Answer 301

One unpaired electron

Answer 302

No unpaired electron

Answer 303

Two unpaired electron

Answer 304

None of these

Answer 305

Bond length in NO⁺ is greater than in NO

Answer 306

Bond length in NO⁺ is equal to that in NO

Answer 307

Bond length in NO is greater than in NO⁺

Answer 308

Bond length is unpredictable

Answer 309

Octahedral

Answer 310

Square planar

Answer 311

Trigonal bipyramidal

Answer 312

Greater than 1.7

Answer 313

No specificity exist

Answer 314

Equal to 1.7

Answer 315

Lesser then 1.7

Answer 316

sp- hybridized carbon

Answer 317

sp³-hybridized carbon

Answer 318

sp²- hybridized carbon

Answer 319

always same irrespective of its hybrid state

Answer 320

All p-orbitals are involved

Answer 321

One s and 3 p-orbitals are involved

Answer 322

One p-orbital is involved

Answer 323

Four p-orbitals are involved

Answer 324

Tetrahedron

Answer 325

There may not be a possibility of chemical reaction

Answer 326

Lemon juice is dangerous for health

Answer 327

There may be a possibility of a chemical reaction

Answer 328

Water should be preferred over lemon Juice for drinking

Answer 329

Increase from top to bottom in a group

Answer 330

Does not change in a period

Answer 331

Does not change in a group

Answer 332

Generally increases from left to right in a period

Answer 333

Photosensitivity of sodium

Answer 334

Low ionization energy of sodium

Answer 335

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

Answer 336

Sublimation of metallic sodium to give yellow vapour

Answer 337

Fourth Bohr orbit to the first Bohr orbit

Answer 338

Fifth Bohr orbit to the second Bohr orbit

Answer 339

Sixth Bohr orbit to the third Bohr orbit

Answer 340

Seventh Bohr orbit to the third Bohr orbit

Answer 341

Linear geometry

Answer 342

SP hybridization

Answer 343

Dipole moment is zero

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