Chemical Bonding and Molecular Structure Test

Result

Chemical Bonding and Molecular Structure Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

The electronic configuration of four atoms are given in brackets:
L(1s²2s²2p¹);
M(1s²2s²2p⁵);
Q(1s²2s²2p⁶3s¹);
R(1s²2s²2p²);
The element that would most readily form a diatomic molecule is

A
Q

B
M

C
R

D
L

Solution

By sharing of 1electron each, both the atoms of M will get a completed octet.
Question 2
4 / -1

Two elements P and Q combine to form a compound. If P has 2 and Q has 6 electrons in their outermost shell, what will be formula of the compound formed?

A
PQ

B
P₂Q

C
P₂Q₃

D
PQ₂

Solution

Valence electrons in P is 2; Valence electrons in Q is 6.
P - 2e^- → P²⁺
Q + 2e^- → Q^2-
Since both show a valency of 2, the formula for the compound will be PQ.
Question 3
4 / -1

How many number of electrons are involved in the formation of a nitrogen molecule?

A
Three

B
Four

C
Eight

D
Six

Solution

Number of electrons involved in bonding is 6.
Question 4
4 / -1

In which of the following molecules octet rule is not followed?

A
NH₃

B
CH₄

C
CO₂

D
NO

Solution

For NO, the octet rule is not followed due to the presence of odd electrons on N.
Question 5
4 / -1

A pair of electrons present between two identicalnon-metals.

A
is shifted to one of the atoms

B
is shared equallybetween them

C
undergoes addition reactions

D
have same spin.

Solution

An electron pair is equally shared between two identical atoms like F — F, H — H.
It is pulled towards a more electronegative atom in case of dissimilar atoms.
Question 6
4 / -1

During a coordinate bond formation,

A
one electron from an atom is transferred to other

B
one electron each is lost from both the atoms

C
a pair of electrons is contributed by one atom and shared by both the atoms

D
a pair of electrons is transferred to the other atom.

Solution

In a coordinate or dative bond, electrons required for sharing are contributed by one atom. The atom which contributes the electrons for sharing is called donor atom and the atom which shares the electrons is called acceptor atom.
Question 7
4 / -1

Which of the following molecules contains covalent and coordinate bonds?

A
CCI₄

B
H₂SO₄

C
NaCl

D
Mg(OH)₂

Solution
Question 8
4 / -1

Which of the following shows the Lewis dot formula for CO₂?

A

B

C

D

Solution

Step I: Skeleton OCO
Step II: A = 1 x 4 for C + 2 x 6 for O = 4 + 12 = 16 electrons
Step III : Total no. of electrons needed to achieve noble gas configuration (N)
N= 1 x 8 + 2 x 8 = 24
Step IV : Shared electrons, S = N- A = 24-16 = 8 electrons
Question 9
4 / -1

How many and what types of bonds are present in NH₄⁺?

A
Four covalent bonds

B
Three covalent bonds and one ionic bond

C
Four ionic bonds

D
Three covalent bonds and one coordinate bond

Solution
Question 10
4 / -1

What is the formal charge on carbon atom in the following two structures?

A
0,2

B
0,0

C
+2,-2

D
+1,-1

Solution

Formal charge on C atom = Valence electrons
-Lone pair of electrons −1/2× Bonding electrons
formal charge on C atom =0