Atomic Bonding Test

Result

Atomic Bonding Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following electron dot structures is incorrect?

A

B

C

D

Solution

The chemical formula of water molecule is H₂O in which oxygen has 6 valence electrons and each hydrogen has one. Hydrogen tends to get duplet configuration which is for next noble gas; Helium. Hence, each hydrogen can form one bond to set stable configuration and oxygen requires two electrons to get noble gas configuration for stability. Therefore, the correct electron dot structure of H₂O is:
Question 2
1 / -0

How many lone pairs are there in a molecule of ammonia?

A
1

B
2

C
3

D
0

Solution

A molecule of ammonia contains one lone pair of electrons.
Question 3
1 / -0

Which of the following molecules possess incomplete octet?

A
PCl₅

B
SF₆

C
IF₇

D
BeCl₂

Solution

In the formation of a covalent bond, the atoms attain an inert gas configuration with an octet of electrons (i.e. ns²p⁶ configuration). This is known as the octet rule or the rule of eight. But, there are many covalent compounds or molecules in which the central atom, which is covalently bonded with other atoms, has less than eight electrons in its outermost shell form incomplete octet. For example, BeCl₂.
Question 4
1 / -0

Which of the following is correctly arranged in the increasing order of their bond lengths?

A
C C < C = C < C – C

B
C = C < C – C < C C

C
C C < C – C < C = C

D
C – C < C = C < C C

Solution

From the above given options, option (1) is correctly arranged in the increasing order of their bond lengths.
Question 5
1 / -0

According to octet theory, during bond formation, the elements

A
tend to acquire a noble gas configuration

B
have a tendency to acquire unstable configuration

C
merely change their configuration

D
None of these

Solution

The octet rule observe that the atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electron configuration as a noble gas.
Question 6
1 / -0

Which among the following compounds possesses molecules having both covalent and ionic bonds?

A
Sodium hydroxide (NaOH)

B
Sodium chloride (NaCI)

C
Carbon dioxide (CO₂)

D
Water (H₂O)

Solution

In NaOH, there is an ionic bonding between Na⁺ and OH^-. But there is covalent bonding between the O and H atoms of OH^- ion.
Question 7
1 / -0

Which of the following statements regarding - bond is not true?

A
It may be formed by the overlapping of p-atomic orbitals.

B
It has no independent existence.

C
It is a weaker bond compared to - bond.

D
It can be formed by hybrid orbitals.

Solution

^{_A_{- bond is formed by the lateral overlap of unhybridised orbitals.}}
Question 8
1 / -0

Which of the following statements is incorrect?

A
KCl is soluble in water.

B
HCl conducts electricity in its aqueous solution.

C
Acetic acid is soluble in water.

D
The bond formed between aluminium and fluorine is covalent.

Solution

The bond formed between aluminium and fluorine is ionic because metals form ionic bonds with non-metals.
Question 9
1 / -0

Which of the following consists of a single covalent bond?

A
Cl₂

B
O₂

C
N₂

D
CO₂

Solution

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs. Among the given options, only chlorine forms a single covalent bond by sharing 1 pair of electrons between the two chlorine atoms.
O₂ and CO₂ contain double bonds and N₂ contains a triple bond in its structure.
Question 10
1 / -0

What is the nature of bonds present in ammonium hydroxide?

A
Ionic and covalent

B
Ionic, covalent and co-ordinate covalent

C
Covalent and co-ordinate covalent

D
Ionic and co-ordinate covalent

Solution

The bonds between N and H atoms in NH₃ are covalent.
NH₄⁺ ion is formed by a coordinate bond between ammonia and the proton. The nitrogen atom becomes the donor. The hydrogen ion becomes the acceptor. The linkage between N and H atoms is called coordinate bond. It is represented by an arrow '→'.
The bond between the ammonium ion and the hydroxide ion is ionic.
Question 11
1 / -0

How many Na⁺surround a Cl^-in a crystal lattice of NaCl?

A
3

B
6

C
2

D
4

Solution

The coordination number of a cation and an anion in the NaCl crystal is 6.
Every Na⁺ ion is surrounded by 6 Cl^- ions and every Cl^- is surrounded by 6 Na⁺ ions.
Question 12
1 / -0

What is the shape of a water molecule?

A
Linear

B
Tetrahedral

C
Trigonal planar

D
Bent

Solution

Bent: The oxygen atom in H₂O is sp³ hybridised, but the expected tetrahedral geometry is distorted to angular bent due to the presence of two lone pairs. The H-O-H bond angle is about 105°.
Question 13
1 / -0

Which of the following has the highest melting and boiling points?

A
HF

B
CCl₄

C
Cl₂

D
NaCl

Solution

NaCl has the highest melting and boiling points amongst all as it is an ionic compound which has strong electrostatic bonds between two oppositely charged ions. It leads to a compact packing. Therefore, it becomes very difficult for the compound to change its molecular structure to change its state and a lot of heat energy is required to do so. Hence, its melting and boiling points are very high.
Question 14
1 / -0

Which of the following covalent compounds is non-polar?

A
H₂O

B
HF

C
N₂

D
NH₃

Solution

Non-polar covalent bonding results when two identical non-metals equally share electrons between them. For example: N₂.
Question 15
1 / -0

Which of the following solutions does not have a hydrogen bond?

A
H₂S

B
C₂H₅OH

C
HF

D
NH₃

Solution

In H₂S, sulphur does not have characteristic of hydrogen bond because it is not very electronegative. Sulphur has an electronegativity of 2.5 compared to hydrogen's 2.1. As electronegativity difference is very less, so it cannot form hydrogen bond.
Question 16
1 / -0

Which of the following bonds is more polar as compared to others?

A
O – H

B
N – H

C
C – H

D
H – H

Solution

O – H bond is most polar bond as it has maxmium electronegativity difference between them.
Question 17
1 / -0

Which of the following is not a covalent compound?

A
S₂Cl₂

B
PCl₅

C
SiC₄

D
MgCl₂

Solution

An ionic compound is a chemical compound in which ions are held together in a structure by electrostatic forces termed ionic bonds. The positively charged ions are called cations and the negatively charged ions are called anions. For example MgCl₂.
Question 18
1 / -0

How many covalent bonds are present in a nitrogen molecule?

A
Single covalent bond

B
Double covalent bond

C
Triple covalent bond

D
Quadruple covalent bond

Solution

In a nitrogen molecule, triple covalent bond is present.
Question 19
1 / -0

Which of the following is an electrovalent compound?

A
CaO

B
H₂O

C
CCl₄

D
HF

Solution

Electrovalent (ionic) compounds are formed by complete transfer of electrons. The constituent particles in these compounds are ions. Metals combine with non-metals to form ionic compounds. For example: CaO
Question 20
1 / -0

How many shared pairs of electrons are there in a molecule of methane?

A
2

B
3

C
1

D
4

Solution

A molecule of methane is formed by four covalent bonds between carbon and hydrogen.