Octet Rule

Q.

How to calculate the valency of nitrogen?

Q.

Why does in a chemical equation hydrogen becomes H₂ rather than simply H

Q.

Why do atoms combine?

Q.

Assertion (A) Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.

Reason (R) This is because sodium and chloride ions acquire octet in sodium chloride formation.

Choose the correct option.

1. A and R both are correct and R is the correct explanation of A

2. A and R both are correct, and R is not the correct explanation of A

3. A is true, but R is false

4. A and R both are false

Q.

Which is the most electronegative atom?

Q.

What is the lone pair effect?

Q. A lone pair of electrons is defined as the pair of electrons which are ___________.

1. gained by one of the participating atoms
2. not shared by any of the participating atoms
3. shared by the participating atoms
4. lost by one of the participating atoms

Q. What is the difference between:​
(c) a polar covalent compound and a nonpolar covalent compound?​

Q. Metals generally have very high melting and boiling points due to strong ___ bonds.

1. covalent
2. hydrogen
3. ionic
4. metallic

Q.

What is the valency of nitrogen in ammonia (${\mathrm{NH}}_3$)?

Q.

Why are noble gases sometimes called rare gases?

Q. Which of the following is/are true about - He, Ne, Ar, Kr, Xe, Rn etc. ?

1. They are group 3 elements.
2. They are very stable elements.
3. They do not form bonds with their own species.
4. They are noble gases.

Q.

What are noble gases why are they also called inert gases?

Q.

Hydrogen bond is represented by a__________.

Q.

Inert gases have ______________electrons in their outermost shell.

Q.

According to octet rule, atoms tends to acheive _____ electrons in the outermost shell.

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

Q. Deduce a relationship between volume and pressure for a given mass of a gas at a constant temperature.

Q. Chlorine requires ______ electron(s) to attain stable electronic configuration.

1. 0
2. 1
3. 3
4. 2

Q. Why Inner shell electrons do not take part in chemical bonding??

Q. An element M is in the 13th group.what is the formula of its chloride?

Q. Question 10
Which of the following is the correct representation of electron dot structure of nitrogen
(a)

(b)

(c)

(d)

Q. In a stable molecule, the force that holds two or more atoms together is known as :

1. Valency
2. Chemical Bonding
3. Octet
4. Duplet

Q.

Inert gases are very reactive in nature.

1. True
2. False

Q. Define a functional group and give the structural formula of the following functional group:
(b) alcohols

Q. From the following organic compounds given below, choose one compound in each case which relates to the description [i] to [iv]: [Ethyne, ethanol, acetic acid, ethene, methane].​

(ii) An organic compound whose functional group is carboxyl.​

​

Q. In which of the following molecules the central atom of the molecule does not have octet?

1. $P{Cl}_3$
2. $B{Cl}_3$
3. ${BF}_3$
4. $Al{Cl}_3$

Q. The maximum number of electrons that can be accommodated in the outermost orbit is :

1. 2
2. 8
3. 16
4. 52

Q.

What is the meaning valency?

Q. The constant quantity of Boyle’s Law is_________

1. Mass and Pressure of a gas
2. Only mass of the gas
3. Mass and temperature of a gas
4. Only temperature of a gas

Q. Write the IUPAC name of the following:​