Covalent Bond

Q.

What is covalent bonding? explain with example.

Q. Which of the following is not a characteristic of an ionic compound?

1. Insoluble in water
2. Conductor of electricity
3. High melting point
4. Oppositely charged ions

Q.

Write the molecular formula of ethene and draw its electron dot structure.

Q.

Which of the following molecules has a triple covalent bond between the atoms?

1. All of the above

2. $N_2$

3. $H_2$

4. $O_2$

Q.

Which of the following contains only three pairs of electrons?

1. Free radical

2. Carbanion

3. Carbocation

4. All of these

Q.

The covalency of oxygen is___ .

Q.

Which among the given compounds is/are held together by a covalent bond?

1. Sodium fluoride

2. Hydrogen chloride

3. Sodium chloride

4. Magnesium oxide

Q.

The hydride of oxygen is H2O but the hydride of Chlorine is HCl. Give reasons.

Q.

Is AgBr Soluble in Water?

Q. Covalent compounds generally exhibit:

1. Low melting points
2. High solubilities in water
3. High electrical conductivity
4. High boiling points

Q. bond is formed between two fluorine atoms to attain stability.

1. Single
2. Double
3. Triple

Q. (c) The electronic configuration of nitrogen is $(2,5)$. How many electrons in the outer shell of a nitrogen atom are involved in the formation of a nitrogen molecule?

Q.

Why was carbon 12 chosen over oxygen for atomic mass if oxygen was so suitable?

Q.

Why the compound BF₃ is stable however after forming the covalent bond boron contain only 6 electrons instead of 8 in its outermost shell.

Q.

What is electrovalent bond?

Q. Silicon has 4 electrons in the outermost orbit. In order to form bonds,

1. It gains electrons
2. None of these
3. It loses electrons
4. It shares electrons

Q.

Assertion (A): Atoms combine chemically to form molecules.
Reason (R): Most of the atoms do not exist independently.

1. Both A and R are false​
2. Both A and R are true, but R is not the correct explanation of A​
3. Both A and R are true, and R is the correct explanation of A​
4. A is true but R is false​

Q. How many electrons are present in one single bond formed between two atoms?

1. 2
2. 8
3. 1
4. 10

Q.

The hydrogen bond is shortest in F - H ........F .

1. False

2. True

Q. Metal M forms a chloride with the formula $MC{l}_2$. What type of bond in $MC{l}_2$? Write the formula of the compound when M combines with sulphur, oxygen and nitrogen.

Q.

What is divalent and covalent compounds?

Q.

Bond between hydrogen and chlorine in HCl is

1. Ionic

2. Non-polar covalent

3. Coordinate

4. Polar covalent

Q.

Assertion (A): Carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration.

Reason (R): Carbon has four electrons in its outermost shell and has the tendency to share electrons with carbon or other elements.

1. Both (A) and (R) are true and (R) is correct explanation of the assertion (A)

2. Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A)

3. (A) is true, but (R) is false

4. (A) is false, but (R) is true.

Q.

Which of the following elements can combine with all non-metals with the help of covalent bonds?

1. Magnesium

2. Hydrogen

3. Calcium

4. Oxygen

Q. Differences between H2 and 2H.

Q. How many pairs of electrons are shared between the two Nitrogen atoms in ${\text{N}}_2$ molecule?

1. 3
2. 6
3. 8
4. 10

Q.

How many covalent bonds are present in an iso-butane molecule ?

1. 13

2. 12

3. 10

4. 11

Q.

Which of the following compounds are poor conductors of electricity?

1. Distilled water

2. HCl

3. $C{H}_{3}COOH$

4. $H_{2}S{O}_4$

Q.

Name the following:

A bond that is formed by the sharing of electrons between non-metals.

Q. 1.What is plasma state ? 2.What is bose einstein condensate?