Chemical Bonding and Molecular Structure Test 54

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Chemical Bonding and Molecular Structure Test 54

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Weekly Quiz Competition

Question 1
1 / -0

The number of $$P-O-P$$ bonds in cyclic meta phosphoric acid is:

A
one

B
two

C
three

D
four

Solution

The number of $$P-O-P$$ bond in cyclic metaphosphoric acid is three.
Question 2
1 / -0

In benzene the total number of $$\sigma$$ bonds is

A
$$3$$

B
$$6$$

C
$$9$$

D
$$12$$

Solution

$$C-C\ \sigma$$ bonds $$=6$$
$$C-H\ \sigma $$ bonds $$=6$$
__________
Total sigma bond $$=12$$
Question 3
1 / -0

Number of sigma bonds in $$P_4O_{10}$$ is:

A
6

B
7

C
17

D
16

Solution

Number of sigma bonds in $$P_4O_{10}$$ is $$(d)$$ $$16$$.
Question 4
1 / -0

The bond in $$K_{4}[Fe(CN)_{6}]$$ are

A
all ionic

B
all covalent

C
ionic and covalent

D
ionic, covalent and co-ordinate covalent

Solution

The bond in $$K_{4}[Fe(CN)_{6}]$$ are ionic, covalent and co-ordinate covalent.

Ionic bond between cation and anion, covalent bond between C and N atom in the ligand and coordinate bond between ligand and central metal atom.
Question 5
1 / -0

Number of bonds in benzene

A
$$6\sigma$$ and $$3\pi$$

B
$$12\sigma$$ and $$3\pi$$

C
$$3\sigma$$ and $$12\pi$$

D
$$6\sigma$$ and $$6\pi$$

Solution

The number of bonds in benzene is $$12\sigma$$ and $$3\pi$$ bonds.
Question 6
1 / -0

Number of $$\sigma$$ bonds in

A
$$6$$

B
$$15$$

C
$$10$$

D
$$12$$

Solution

There are $$15\ \sigma$$ and $$3\ \pi$$ bonds in the given molecule. Each double bond contain $$1\ \sigma$$ and $$1\ \pi$$ and single bond form is always a sigma bond.
Question 7
1 / -0

Which of the following statements is wrong?

A
Single $$N-N$$ bond is stronger than the single $$P-P$$ bond.

B
$$PH_{3}$$ can act as a ligand in the formation of coordination compound with transition elements.

C
$$NO_{2}$$ is paramagnetic in nature.

D
Covalency of nitrogen in $$N_{2}O_{5}$$ is four.

Solution

N-N sigma bond (single bod) is weaker than the P-P sigma bond (single bond) due to the small bond length between the nitrogen atoms. The lone pair of electrons of both the atoms nitrogen repel each other making the single bond between N−N weaker than P-P sigma bond. In P−P bond the repulsion between sigma bond and lone pair electrons is less as the size of phosphorous is large.

So statement A is wrong. Hence option A is correct.
Question 8
1 / -0

In a compound the number of sigma and pi bonds respectively are :

A
19, 11

B
19, 5

C
13, 11

D
7, 3

Solution

It is known that all single bond is sigma bond while multiple bond is made of 1 sigma bond and rest pi bond.
here
between N and C have 1 sigma and 2 pi bond
between c and O have 1 sigma and 2 pi bond
M and C have 3 sigma bonds
now on counting all nonds
we get sigma bond =19
pi bond =11
Question 9
1 / -0

Which one of the following compounds can form H-bonding with each other?

A
$$CH_{3}COOH \text{ and } H_{2}O$$

B
$$\text{Phenol and } CH_{4}$$

C
$$CHF_{3} \text{ and acetone}$$

D
$$PH_{3} \text{ and } HF$$

Solution
Question 10
1 / -0

Which of the following compounds have the same no. of lone pairs with their central atom?

(I) $$XeF_5^-$$ (II) $$BrF_3$$ (III) $$XeF_2$$ (IV) $$H_3S^+$$ (V) Triple Methylene

A
IV and V

B
I and III

C
I and II

D
II, IV and V

Solution

$$XeF_5^-$$ : 2 lone pairs : pentagonal planar

$$BrF_3$$ : 2 lone pairs : Bent-T-shape

$$XeF_2$$ : 3 lone pairs : Linear

$$H_3S^+$$ : 1 lone pairs : Pyramidal Linear

Triple Methylene : 1 lone pair : V-shape