Covalent Bond

Q.

What is the full form of LPG?

Q.

Draw the electron dot structures of the following compounds and state the type of bonding in each case:
(i) $C{O}_2$

(ii) $MgO$

(iii) $H_{2}O$

(iv) $HCI$

(v) $MgC{l}_2$

Q.

Which of the following has the shortest carbon-carbon bond length?

1. C₂H₄

2. C₂H₂

3. C₂H₆

4. All have the same bond length

Q. The co-ordination number of a chlorine ion in a sodium chloride lattice is _______.

1. 4
2. 8
3. 6
4. 5

Q. The total number of lone pairs present in a water molecule is:

1. 2

Q.

Why do covalent compounds have low melting and boiling points?

1. Weak VanderWaals force of attraction between molecules.

2. Strong VanderWaals force of attraction between molecules.

3. Large amount of energy required to break the force of attraction.

4. None of the above

Q.

Which compound has the highest covalent character?

1. LiCl

2. LiBr

3. Lil

4. LiF

Q. How many lone pairs of electrons are there in oxygen molecule?

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

Q. Which of the following has the least bond angle?

1. $N{H}_3$
2. $H_{2}O$
3. $C{H}_4$
4. $Be{F}_2$

Q.

(a) Compound X consists of molecules.

Choose the letter corresponding to the correct answer from the options A, B, C and D given below :

(i) The type of bonding in X will be :

A. ionic B. electrovalent

C. covalent D. molecular

(ii) X is likely to have a :

A. low melting point and high boiling point,

B. high melting point and low boiling point,

C. low melting point and low boiling point,

D. high melting point and high boiling point.

(iii) In the liquid state, X will :

A. become ionic,

B. be an electrolyte

C. conduct electricity,

D. not conduct electricity.

(b) Electrons are getting added to an element Y :

(i) is Y getting oxidized or reduced ?

(ii) what charge will Y migrate to during the process of electrolysis ?

Q.

What is the nature of the bonding in Phosphorus tri-chloride?

1. Ionic bond

2. Covalent bond

3. Covalent coordinate bond

4. Metallic bonding

Q.

What is the versatile nature of Carbon?

Q.

What type of bonds is present in a water molecule? Draw the electron dot structure of waster $\left(H_{2}O\right)$.

Q.

State the type of bonding in the following molecules.

(a) water, (b) calcium oxide,

(c) hydroxyl ion, (d) methane,

(e) ammonium ion, (f) ammonium chloride

Q.

Why is $\mathrm{NaCl}$ not a molecule?

Q. The number of covalent bonds in a molecule of carbon dioxide are:

1. two
2. four
3. six
4. eight

Q.

Both CO₂ and H₂ gases are:

1. Heavier than air

2. Acidic in nature

3. Colorless

4. Soluble in water

Q. Give four differences between organic and inorganic compounds.

Q.

___________________is More Soluble than Potassium Dichromate?

Q. What are substances which conduct electricity in the solid state are generally called?

Q.

What do you understand by " Carbon is tetravalent compund "

Q.

Is NaCl a pure covalent compound?

Q.

What is the strongest bond?

Q.

(a) What type of chemical bond is present in the chlorine molecule? Explain your answer.
(b) Explain the formation of a chlorine molecule on the basis of the electronic theory of valency.

Q.

The number of covalent bonds in pentane (molecular formular $C_5{H}_{12}$) is :
(a) 5 (b) 12 (c) 17 (d) 16

Q.

How many pi bonds are in sp³ hybridization?

Q.

How do I know if a Molecule is Polar or Nonpolar ?

Q.

How many P-O-P bonds are there in Pyrophosphoric acid?

Q.

Why does carbon form a large number of compounds?

1. Tetravalency

2. Multiple bonds formation

3. Strong ionic nature

4. Property of catenation

Q.

Arrange the following bonds according to their average bond energies in descending order:$\mathrm{C}-\mathrm{Cl},\mathrm{C}-\mathrm{Br},\mathrm{C}-\mathrm{F},\mathrm{C}-\mathrm{I}$

1. $\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{I}>\mathrm{C}-\mathrm{F}$

2. $\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{I}>\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{F}$

3. $\mathrm{C}-\mathrm{I}>\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{F}$

4. $\mathrm{C}-\mathrm{F}>\mathrm{C}-\mathrm{Cl}>\mathrm{C}-\mathrm{Br}>\mathrm{C}-\mathrm{I}$