laboursonline – MCQs, Mock Tests | IIT JEE IIT JEE CHEMISTRY Chemical Bonding And Molecular Structure Part-1

The bond angle in ammonia is

1. 106 degree
2. 107 degree
3. 110 degree
4. 99 degree

✅ Correct Answer: 2

The increase in bond order results in

1. increase in bond length and bond energy
2. decrease in bond length and bond energy both
3. decrease in bond length and increase in bond energy
4. none of the above

✅ Correct Answer: 3

In which of the followingmolecules carbon is not sp3 hybridized?

1. Benzaldehyde
2. Cyclohexane
3. Phenol
4. Benzyl chloride

✅ Correct Answer: 1

Hydrogen chloride gas has

1. hydrogen bond
2. ionic bond
3. covalent bond
4. double bond

✅ Correct Answer: 3

Ethyl alcohol and methoxy methane are isomeric but ethyl alcohol has higher boiling point because

1. alcohol has hydrogen bonding
2. alcohol is soluble in water
3. ether is more volatile
4. ether is denser than alcohol

✅ Correct Answer: 1

Strongest bond is formed by the overlap of

1. s-s orbitals
2. ps orbitals
3. p-p orbitals
4. s and p orbitals

✅ Correct Answer: 3

In which of the following octet rule is not applicable?

1. Alkali earth metal
2. Alkaline earth metal
3. Transition elements
4. p-block

✅ Correct Answer: 3

Water has high boiling point because it

1. is ionic
2. is covalent
3. has high dielectric constant
4. is having hydrogen bonding

✅ Correct Answer: 4

Which of the following is most volatile?

1. HF
2. HCI
3. HI
4. HBr

✅ Correct Answer: 1

Which of the following is the weakest bond?

1. Metallic
2. Covalent
3. Ionic
4. H

✅ Correct Answer: 4

Covalent character of an ionic compound increases with

1. decrease in anion size
2. decrease in cation size
3. increase in cation size
4. decrease in both cation and anion size

✅ Correct Answer: 3

Which of the following has maximum ionic character?

1. LiCl
2. CuCl
3. NaCl
4. CsCl

✅ Correct Answer: 4

Higher the bond order greater is

1. bond energy
2. bond angle
3. bond length
4. paramagnetism

✅ Correct Answer: 3

Oxygen-oxygen bond length in ozone is same because of

1. hyper conjugation
2. resonance
3. covalent and ionic bond
4. refraction

✅ Correct Answer: 2

Ionic solids are characterised by

1. good conductivity in solid state
2. solubility in polar solvent
3. high vapour pressure
4. low melting point

✅ Correct Answer: 2

From the following molecules one that contains both ionic and covalent bonds is/are

1. chlorobenzene
2. sodium chloride
3. sodium hydroxide
4. Water

✅ Correct Answer: 3

Which of the following is a triatomic molecule?

1. Ammonia
2. Phosphine
3. Sulphuric anhydride
4. Sulphurous anhydride

✅ Correct Answer: 4

The hydrogen halide which has maximum boiling point is

1. HI
2. HBr
3. HF
4. HCl

✅ Correct Answer: 3

Ammonia molecule is

1. triangular bipyramidal
2. octahedral
3. tetrahedral
4. pyramidal

✅ Correct Answer: 4

The bond angle in water is

1. 104.5 degree
2. 94 degree
3. 103 degree
4. 99 degree

✅ Correct Answer: 1

The number of electrons that are shared between two atoms having a triple bond are

1. 7
2. 6
3. 5
4. 3

✅ Correct Answer: 2

With the rise of temperature conductivity of metals

1. increases
2. decreases
3. may increase or decrease
4. remains constant

✅ Correct Answer: 1

Silicon dioxide has higher boiling point as compared to carbon dioxide because

1. silicon dioxide is ionic
2. silicon dioxide is octahedral
3. silicon dioxide is a covalent solid
4. silicon dioxide is more polar

✅ Correct Answer: 3

Shape of the molecule is decided by

1. both sigma and pi bonds
2. neither sigma nor pi bonds
3. pi bonds
4. sigma bonds

✅ Correct Answer: 4

Resonance is not shown by

1. carbon dioxide molecule
2. silicon dioxide molecule
3. carbonate ion
4. benzene

✅ Correct Answer: 1

Variable valency is shown by

1. N
2. Na
3. F
4. O

✅ Correct Answer: 4

Amongst HX, the maximum dipole moment is of

1. HBr
2. HCl
3. HF
4. HI

✅ Correct Answer: 3

Maximum covalency of an atom of an element is equal to the

1. no. of unpaired electrons in the p orbitals
2. total no. of electrons in the s and p orbitals
3. total no. of electrons in the p-orbitals
4. none of the above

✅ Correct Answer: 2

An ionic bond is formed when one of the atoms

1. has low ionisation energy
2. has low ionisation energy and other has high electron affinity
3. has high ionisation energy and other has low electron affinity
4. has high electron affinity

✅ Correct Answer: 2

Tetracovalency of carbon can be explained on the basis of

1. electronegativity
2. promotion rule
3. hybridization
4. resonance

✅ Correct Answer: 2

Which among the following is not the characteristic property of carbon?

1. Availability of d-electron for bonding
2. Highest electronegativity in the group
3. Multiple bond formation
4. Resonance

✅ Correct Answer: 1

The number of the unpaired electrons in O-2 ion are

1. 0
2. 4
3. 2
4. 1

✅ Correct Answer: 1

Which of the following bond is the most covalent?

1. Si-H
2. P-H
3. N-H
4. none of the above

✅ Correct Answer: 3

Nitrogen atom has atomic no. 7 while oxygen atom 8. The total number of electrons in nitrate ion is:

1. 18
2. 28
3. 32
4. 16

✅ Correct Answer: 3

Maximum number of bonds between two atoms of a covalent bond can be

1. four
2. five
3. three
4. zero

✅ Correct Answer: 3

Diamond is not conducting electrically because

1. there are only carbon atoms present
2. it is of crystalline nature
3. its structure is very compact
4. no free electrons are presen

✅ Correct Answer: 4

Metallic sodium is

1. conductor of electricity
2. insulator
3. semi-conductor
4. none of these

✅ Correct Answer: 1

Which of the following bond is the most polar?

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

✅ Correct Answer: 2

A metallic bond is

1. electrostatic
2. covalent
3. polar
4. non polar covalent bond

✅ Correct Answer: 1

A molecule which contains unpaired electron is

1. carbon monoxide
2. oxygen molecule
3. molecular nitrogen
4. carbon dioxide

✅ Correct Answer: 1

Which concept explains the fact that ortho nitro-phenol is more volatile than p-nitrophenol?

1. Hydrogen bonding
2. Hyper conjugation
3. Covalent bonding
4. Resonance

✅ Correct Answer: 1

Electonegativity values of elements help in predicting

1. polarity of molecules
2. covalency of the elements
3. size of the atoms
4. bond length

✅ Correct Answer: 1

Which out of the following has highest boiling point?

1. HCl
2. HBr
3. HF
4. HI

✅ Correct Answer: 4

Out of the following the weakest interact are involved in

1. Van der Waals interaction
2. ionic bond
3. polar covalent bond
4. hydrogen bond

✅ Correct Answer: 1

Ionic bond formation is favoured by

1. larage cation and large anion
2. small cation and small anion
3. small cation
4. small anion

✅ Correct Answer: 2

The bond formation in atoms is due to the fact that they

1. get their energy lowered
2. acquire higher energy state
3. change their position
4. none of the above

✅ Correct Answer: 1

The nature of bonding in BF3.NH3 is

1. ionic
2. co-ordinate
3. covalent
4. metallic

✅ Correct Answer: 2

Formation of ionic compounds is favoured by

1. low charge on cation and anion
2. low electron affinity of anion
3. high ionisation energy of cation
4. high lattice energy

✅ Correct Answer: 4

The element with atomic no. 9 can exhibit an oxidation state of

1. 1
2. 2
3. 5
4. -1

✅ Correct Answer: 4

Which among the following elements has tendency to form covalent compounds?

1. Aluminium
2. Strontium
3. Beryllium
4. Calcium

✅ Correct Answer: 3