laboursonline – MCQs, Mock Tests | IIT JEE IIT JEE CHEMISTRY Chemical Bonding And Molecular Structure Part-2

The partial ionic character of HCl is due to difference in

1. ionisation potential
2. electronegativity
3. electron affinity
4. None of these

✅ Correct Answer: 2

Which of the following groups of atoms gain electrons readily?

1. N P As
2. Li Na K
3. Cl Br I
4. Ca Sr Ba

✅ Correct Answer: 3

Hydrogen bond is formed in compounds containing hydrogen and

1. negatively charged species
2. positively charged species
3. highly electronegative atom
4. highly electropositive atom

✅ Correct Answer: 3

When a molecule is formed by the combination of atoms

1. only repulsive forces operate
2. only attractive forces operate
3. none of these forces operate
4. both A and B operate

✅ Correct Answer: 4

Molecular orbital theory was developed by

1. Rutherford
2. Millikan
3. Planck
4. Bohr

✅ Correct Answer: 2

Bond order is given by

1. 3(na-nb)
2. 3(nb+na)
3. 2(nb-na)
4. (nb-na)/2

✅ Correct Answer: 4

Which of the following bonds will be non polar?

1. N-H
2. C-H
3. F-F
4. Cl-Cl

✅ Correct Answer: 3

The atomic number of element which shows oxidation state of +3 is

1. 13
2. 16
3. 23
4. 18

✅ Correct Answer: 1

The most covalent halide of aluminium is

1. aluminium chloride
2. aluminium iodide
3. aluminium fluoride
4. aluminium bromide

✅ Correct Answer: 2

Sulphuric acid molecule contains

1. covalent and ionic bonds
2. only ionic bonds
3. only covalent bonds
4. covalent and co-ordinate bonds

✅ Correct Answer: 3

Which combination of atomic orbitals is not allowed according to MO theory?

1. Px - Px
2. Px - Py
3. Py - Py
4. Pz - Pz.

✅ Correct Answer: 2

The molecule of ICI is

1. polar with negative end at iodine
2. polar with negative end at chlorine
3. purely electrovalent
4. purely covalent

✅ Correct Answer: 2

Nitrogen atom has 7 protons 7 electrons and 7 neutrons. The nitride ion has

1. 7 protons 7 neutrons 9 electrons
2. 8 protons 6 neutrons 4 electrons
3. 5 protons 6 neutrons 7 electrons
4. 7 protons 7 neutrons 10 electrons

✅ Correct Answer: 4

Which of the following bond is most polar?

1. C-H
2. N-H
3. S-H
4. O-H

✅ Correct Answer: 4

he half of the difference between the number of electrons in bonding and antibonding MOs is called

1. molecular order
2. bond order
3. electronic order
4. bonding capacity.

✅ Correct Answer: 2

What is not true for resonance?

1. Cannonical forms differ only in electronic arrangement
2. Cannonical forms differ in atomic as well as electronic arrangement
3. Cannonical forms have same number of unpaired electrons
4. Cannonical forms are hypopthetical.

✅ Correct Answer: 2

In a homonuclear molecule higher the bond order larger will be

1. bond length
2. bond strength
3. paramagnetism
4. ionic character.

✅ Correct Answer: 2

KCl readily dissolves in water because

1. it is a salt of potassium
2. it is ionic compound
3. it reacts with water
4. it has appreciable covalent character.

✅ Correct Answer: 2

Tetrahedral bonding of carbon atoms was first shown by

1. Vant Hoff and Le Bel
2. Planck
3. Lewis
4. Buffer

✅ Correct Answer: 1

C-H bond distance is smallest in

1. methane
2. ethene
3. ethyne
4. ethane.

✅ Correct Answer: 3

Which of the following pairs of compound will not form H-bonds with each other?

1. Ethanol-methanol
2. Ethanol-water
3. Chloroform-acetone
4. Carbon tetrachloride-acetone.

✅ Correct Answer: 4

Which overlap would result the strongest bond?

1. s-s
2. sp-sp
3. s-p
4. p-p

✅ Correct Answer: 2

Covalent molecules are generally held in the crystal structures by

1. Van der Waals forces
2. electrostatic forces
3. covalent bonds
4. dipolar forces

✅ Correct Answer: 2

A factor that does not favour the formation of cation from the atom M is

1. high charge on resulting cation
2. large size of the atomic radius
3. low ionisation energy
4. low charge on anion

✅ Correct Answer: 1

According to Fajan rules the covalent character is most favored in

1. Small cation large anion
2. Small cation small anion
3. Large cation large anion
4. Large cation small anion.

✅ Correct Answer: 1

During bond formation normally all the elements in their outermost shell acquire

1. three electrons
2. ten electrons
3. eight electrons
4. sixteen electrons

✅ Correct Answer: 3

VSEPR Theory was proposed by

1. Lewis
2. Lewis and Kossel
3. Nyhom and Gillipsie
4. Linus Pauling.

✅ Correct Answer: 3

Formic acid exists as dimer because

1. hydrogen bonds hold the molecules together
2. two molecules exists as a resonance
3. two molecules exist as a single unit
4. None of the above

✅ Correct Answer: 1

The number of electrons being shared in nitrogen molecule is

1. 4
2. 2
3. 8
4. 6

✅ Correct Answer: 4

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

1. Orbital overlap will not occur
2. Bonding will not occur
3. Both (a) (b) are correct
4. None of the above are correct.

✅ Correct Answer: 3

In the co-ordinate bond the acceptor atom must essentially contain in its valence shell an orbital with

1. no electron
2. single electron
3. two unpaired electrons
4. None of these

✅ Correct Answer: 1

Which out of the following has the highest melting point?

1. Cesium fluoride
2. Ammonia
3. Chloroform
4. Helium

✅ Correct Answer: 1

Fused ionic compounds

1. are used as semi-conductors
2. conduct electricity
3. are insulators
4. none of the above

✅ Correct Answer: 2

The aqueous solution of which of the following substances will be able to conduct electricity?

1. Glycerol
2. Sucrose
3. HI
4. Ethanol.

✅ Correct Answer: 3

What is not true about hybridization?

1. Hybrid orbitals form relatively stronger bonds than pure atomic orbitals
2. Hybrid orbitals form sigma bonds
3. Orientation of hybrid orbitals depends upon the type of hybridization
4. Promotion of electron from lower sub-level to higher sub-level of the valence shell is essential for hybridization.

✅ Correct Answer: 4

Linear combination of two hybridized orbital belonging to two different atoms results in the formation of

1. sigma bond
2. pi bond
3. delta bond
4. double bond.

✅ Correct Answer: 1

The shortest carbon carbon bond distance is found in

1. acetylene
2. propane
3. ethane
4. diamond

✅ Correct Answer: 1

Ice and water differ from each other in

1. elemental composition
2. molecular formulae
3. extent of H-bonding
4. nature of interparticle forces.

✅ Correct Answer: 3

Which of the following molecule has dipole moment greater than zero?

1. 3 3-Diethylpentane
2. trans-2-pentene
3. 2 2 3 3-tetramethyl butane
4. Neopentane.

✅ Correct Answer: 2

Which of the following theory provides explanation about paramagnetic nature of oxygen?Electronic theory of valency

1.
2. Valency bond theory
3. Molecular orbital theory
4. All of the above.

✅ Correct Answer: 3

Which of the following does not conduct electricity?

1. Molten NaOH
2. Molten KOH
3. solid NaCl
4. Aqueous NaCl.

✅ Correct Answer: 3

The carbon-carbon link in acetylene contains

1. One sigma and two pi bonds
2. Two sigma and three pi bonds
3. Two sigma and two pi bonds
4. Three sigma bonds.

✅ Correct Answer: 1

Paramagnetism is exhibited by molecules whichc

1. are not attracted by magnetic field
2. contain only paired electrons
3. contain unpaired electrons
4. arry positive charge.

✅ Correct Answer: 3

In diamond the bonds present are

1. ionic covalent
2. covalent dative
3. electrovalent dative
4. covalent only.

✅ Correct Answer: 4

Which one of the following bonds is weakest?

1. ionic bond
2. covalent bond
3. metallic bond
4. van der Waal forces.

✅ Correct Answer: 4

The bond order of NO molecules is

1. 1.5
2. 2
3. 2.5
4. 3

✅ Correct Answer: 3