Introduction of VSEPR

Q. 19. How many neutrons are there in sulphate ion?

Q. a d-orbital can accomodate a maximum of how many electrons

Q. The central atom in $OS{F}_4$ is

1. O

2. S

3. F

4. Both (a) and (b)

Q.

Among the following molecules, the molecule with trigonal planar geometry is:

1. PCl₃

2. BF₃

3. NH₃

4. IF₃

Q. 40.Why AB3L3 types are not possible in nature where A is central atom and B is Bonded atoms and L is lone pair. Note:consider every bond as single bond

Q. Q10) Arrange and explain the following species in increasing order of bond length N2, N2+, N2-- , N22+

Q. Define octet rule and write its significance and limitations.

Q.

What will be the central atom in $XeO{F}_4$?

1. O

2. F

3. Both (a) & (b)

4. Xe

Q. What will be the central atom of $AlC{l}_3$?

1. Al

2. Cl

3. It can be both (a) and (b)

4. There will be no central atom

Q. What will be the shape of $IC{l}_2^{-}$ among the following ?

1. Bent
2. Trigonal planar
3. Trigonal bipyramidal
4. Linear

Q. The number of electron pairs (ep) in $Cl{F}_3$ is

1. 5

2. 4

3. 6

4. 7

Q.

The enolic form of acetone contains

1. 9 sigma bonds, 1 pi bond and 2 lone pairs

2. 8 sigma bonds, 2 pi bonds and 2 lone pairs

3. 10 sigma bonds, 1 pi bond and 1 lone pair

4. 9 sigma bonds, 2 pi bonds and 1 lone pair

Q.

The number of electron pairs (ep) in $Cl{F}_3$ is

1. 4

2. 5

3. 6

4. 7

Q. List the elements whose anions have negative ionization energy

Q. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

Q. What will be the central atom of $AlC{l}_3$?

1. Al

2. Cl

3. It can be both (a) and (b)

4. There will be no central atom

Q.

For gaseous reactions, if $\Delta H$ is the change in enthalpy & $\Delta U$ that in internal energy, then

1. only if the number of mole of product is less than that of reactants

2. is always greater than

3. only if the number of mole of the reactants is less than that of the products.

4. is always less than

Q.

no.of orbitals in Cr+ion?

no.of subshell in cr+ion?

what type of magnetic character it has?

Q.

For the conversion of 1 mole of $S{O}_2\left(g\right)$ into $S{O}_3\left(g\right)$ the enthalpy of reaction at constant volume, $\Delta U$ at $298K$ is $-97.027KJ$. What is the enthalpy of reaction, $\Delta H$ at constant pressure?

1. 

2. 

3. 

4. 

Q. give an example of a molecule with steric number 6 having 3 bond pair and 3 lone pairs.

Q. apply VSEPR postulates to describe the difference in the shapes of polyvalent species SF_​4 , CF₄ and XeF₄

Q. If an element $A$ belongs to Period $3$ and Group II then it will have :

1. $3$ shells and $2$ valence electrons
2. $2$ shells and $3$ valence electrons
3. $3$ shells and $3$ valence electrons
4. $2$ shells and $2$ valence electrons

Q.

Estimate the quantum number in argon 3d orbital and explain the quantu number ?

Q. Why the ionization enthalpy is always positive wehreas electron gain enthalyp can be negative or positive?

Q. An electron in a hydrogen atom in its ground state absorbs twice of its ionization energy what is the wavelength of the emitted electron?

Q. Is the shape of s, p, d, f orbitals suggest path of electrons ?

Q.

Explain the formation of H₂ molecule on the basis of valence bond theory.