Electronegativity and Hybridisation

Q. A compound of formula $A_2{B}_3$ has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms ?

1. hcp lattice- A, $\frac{2}{3}$ tetrahedral voids-B
2. hcp lattice-A, $\frac{1}{3}$ tetrahedral voids-B
3. hcp lattice-B, $\frac{1}{3}$tetrahedral voids-A
4. hcp lattice-B, $\frac{2}{3}$tetrahedral voids-A

Q. A compound is formed by two elements A and B. Atoms of element A forms the ccp lattice and those of element B occupies one third of the tetrahedral voids. The formula of the compound is:
[0.77 Mark]

1. $A_3{B}_2$
2. $A_2{B}_3$
3. $A{B}_3$
4. $A{B}_2$

Q.

The percentage of p-character in the orbitals forming p – p bonds in $P_4$ is

1. 25

2. 50

3. 33

4. 75

Q. Atoms of element B form hcp lattice and those of the element A occupy $\frac{2}{3}$rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

1. $A_4{B}_3$
2. $A_2{B}_3$
3. $A_3{B}_4$
4. $A_3{B}_2$

Q. The relative Lewis acid strengths of boron trihalides are in the order:

1. $BB{r}_3>BC{l}_3>B{F}_3$
2. $B{F}_3>BC{l}_3>BB{r}_3$
3. $B{F}_3>BB{r}_3>BC{l}_3$
4. $BC{l}_3>B{F}_3>BB{r}_3$

Q.

What is the 2 in ${\mathrm{H}}_2\mathrm{O}$ called?

Q.

In diborane the two H-B-H angles are nearly

1. $60°,120°$

2. $95°,120°$

3. $95°,150°$

4. $120°,180$

Q. The F-P-F bond angle in PF3Cl2 will be 90° or 120°

Q. The electronegativity of $H,X$ and $O$ are $2.1,0.8$ and $3.5$ respectively on Pauling scale. The nature of compound $HOX$ is:

1. Acidic
2. Basic
3. Neutral
4. Amphoteric

Q. The percentage of p-character in each orbital of the central atom used for bonding in $N{H}_3$ is:

1. 25%
2. 75%
3. >75%
4. 33.3%

Q. Which of the following has highest number of formula units per unit cell ?

1. $NaCl$ type structure
2. $N{a}_{2}O$ type structure
3. $Ca{F}_2$ type structure
4. All have Same Number of formula unit

Q. Compare bond angle of OCl2 and SCl2. Reason

Q.

The bond angle in water molecule is nearly or Directed bonds in water forms an angle of

1. 120°

2. 180°

3. 109°28′

4. 104°30′

Q.

Explain the bonding in methane molecule using electron dot structure.

Q.

What is the percentage of $\mathrm{s}$ character in ${\mathrm{sp}}^3$ hybridized orbital?

Q. But why Ni(CO)4 is low spin complex? It says that Sp3 hybridisation cant form low spin complex?

Q. Which of the following statements is true regarding $P{F}_{2}C{l}_3$?

1. $F$ occupies the axial position in the trigonal bipyramidal geometry
2. $Cl$ occupies the axial position in the trigonal bipyramidal geometry
3. There is no preference for axial and equatorial positions
4. None of the above

Q. The arrangement of orbitals on the basis of energy is based upon their (𝑛+𝑙) value. Lower the value of (𝑛+𝑙), lower is the energy. For orbitals having the same values of (𝑛+𝑙), the orbital with lower value of n will have lower energy.

Based upon the above information, arrange the following orbitals in the increasing order of energy.

Q.

In which of the following the central atom does not use $s{p}^3$ hybrid orbitals in its bonding

1. 

2. 

3. 

4. 

Q.

The molecular formula of ethyne is __________.

1. ${\mathrm{C}}_3{\mathrm{H}}_6$

2. ${\mathrm{C}}_2{\mathrm{H}}_4$

3. ${\mathrm{C}}_2{\mathrm{H}}_2$

4. ${\mathrm{C}}_2{\mathrm{H}}_6$

Q.
Identify the molecule having S configuration.

1. A
2. B
3. C
4. A and C both

Q. Which of the following statement(s) is/are correct?

1. $Cl{F}_3$, has a hybridisation of $s{p}^{3}d$
2. $S{O}_3^{2-}$ has a hybridisation of $s{p}^3$
3. $S{O}_{2}C{l}_2$ has hybridisation of $s{p}^3$
4. $Cl{O}_2^{-}$ has a hybridization of $s{p}^{3}d$

Q. why is C-C bond stronger than C-N bond?

Q. The decreasing order of nucleophilicity among the nucleophiles
[2005]
(A) $C{H}_3\underset{\underset{O}{|}|}{C}-O^{-}$
(B) $C{H}_3{O}^{-}$
(C) $C{N}^{-}$
(D)

1. (C), (B), (A), (D)
2. (A), (B), (C), (D)
3. (D), (C), (B), (A)
4. (B), (C), (A), (D)

Q. Rank the following free radicals in increasing order of their stability.

1. $D>C>B>A$
2. $A>C>D>B$
3. $A>B>C>D$
4. $C>A>D>B$

Q. Compare bond angle of OSF4, CH2SF4, SF4 OCl2, O2Cl, OCl2-(popular one) Explain the reasons considered

Q. Coordinate and covalent bond of N2o

Q. Explain pπ dπ bonds in MnO4 -

Q. Which of the following molecules has the shortest carbon-to-carbon bond?

1. $C_2{H}_2$
2. $C_2{H}_6$
3. $C_{2}C{l}_6$
4. $C_2{H}_4$

Q. Methane molecule contain how many sigma and pi bonds?

1. 4 , 0
2. 5 , 8
3. 4 , 3
4. 0 , 5