Bond Pairs and Lone Pairs

Q. Why for increasing n , the energy difference between the two adjacent levels of atom decreases.

Q.

The shape of covalent molecule $M{X}_3$ is

1. Pyramidal

2. Either of these depending on the number off lone pairs of electrons on M

3. T - shaped

4. Triangular

Q. Explain why alkyl groups act as electron donors when attached to a $\pi$ system.

Q. 30. What is the Lewis electron dot structure of XeF4

Q.

Which of the following molecule doesnt have a lone pair?

1. ${\mathrm{BeCl}}_2$

2. ${\mathrm{H}}_2\mathrm{O}$

3. $\mathrm{HF}$

4. ${\mathrm{NH}}_3$

Q.

The shape of covalent molecule $M{X}_3$ is

1. T - shaped

2. Either of these depending on the number off lone pairs of electrons on M

3. Pyramidal

4. Triangular

Q.

Total number of lone pairs in $XeO{F}_4$ is:

1. None of these

2. 1

3. 3

4. 2

Q. the What would be the electron dot structure of a molecule of sulphur whichis made up of eight atoms of sulphur

Q.

The number of bond pairs and lone pairs in $H_{2}O$ are _____ & _____ respectively.

1. 2, 1

2. 2, 0

3. 4, 0

4. 2, 2

Q. The number of electron pairs in $OS{F}_4$ is

1. 4

2. 5

3. 5.5

4. 6

Q. identify radius of4orbit for lithium atom

Q.

1. A III B I C IV D II

2. A II B I C I V D III

3. A II B IV C I D III

4. A III B IV C I D II

Q. How to knowif an atom in a molecule is situated in an axial or equatorial position?

Q. Calculate the value $x-yforXeO{F}_4.$ ($x$ = number of $\sigma$ bond pair and $y$= number of lone pair on central atom)

Q.

What exactly is the meaning of radioactive sugar and dynamic equilibrium?

Q.

The number of bond pairs and lone pairs in $H_{2}O$ are _____ & _____ respectively.

1. 2, 1

2. 2, 0

3. 4, 0

4. 2, 2

Q. In BF3 molecule, we see that F donates its lone pair to form a back-bond (coordinate bond) despite being highly electronegative. Similarly, in NF3, why cant F be the donor atom instead of N, by donating its lone pair and forming a coordinate bond?

Q. 53.Why electron cloud of valance shell is symmetrically distributed when octet is complete?

Q. Determine the shape of the following molecules using the VSEPR model.

Q. why is an atom elecrically neutral

Q.

The total number of lone-pairs of electrons in melamine is _____

1. 2

2. 4

3. 6

4. 8