Introduction of VSEPR

Q.

Hydrogen bonds are formed in many compounds e.g., $H_{2}O,HF,N{H}_3.$ The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is:

1. $N{H}_3>HF>H_{2}O$
2. $HF>H_{2}O>N{H}_3$
3. $N{H}_3>H_{2}O>HF$
4. $H_{2}O>HF>N{H}_3$

Q.

Is the molecule ${\mathrm{SF}}_4$ polar or non-polar?

Q. For which of the following sets of four quantum numbers, an electron will have the highest energy?

1. 
2. 
3. 
4. 

Q.

Describe hybridisation in the case of $PC{l}_5\text{and}S{F}_6$. The axial bonds are longer as compared to equatorial bonds in $PC{l}_5$ whereas in $S{F}_6$ axial bonds and equatorial bonds have the same bond length. Explain.

Q.

The bond angle in ${\mathrm{H}}_2\mathrm{O}\mathrm{is}104.5^{°}.$ This fact can be explained with the help of ?

1. VSEPR theory

2. Molecular orbital theory

3. Electronegativity difference between Oxygen and Hydrogen atoms

4. Presence of Hydrogen bond

Q. Which one among the following resonating structures in not correct?

1. 
2. 
3. 
4. 

Q. The element having greatest difference between its first and second ionisation energy is:

1. $K$
2. $Ca$
3. $Mg$
4. $Sc$

Q.

Is ${\mathrm{SiCl}}_4$ square planar or tetrahedral?

Q.

What type of chemical bond is found in Methane?

Q. Which is not true about VSEPR theory?

1. Lone pair-lone pair repulsion is maximum
2. Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.
3. Bigger atoms occupy equatorial positions in trigonal bipyramidal structure.
4. More electronegative atoms occupies the axial position in trigonal bipyramidal structure.

Q. Expand the following bond – line formula to show all the atoms including carbon and hydrogen.
(a)
(b)

(c)
(d)

Q.

Which is more ionic Licl or Nacl?Why?

Q.

How many electrons have magnetic Quantum number equal to zero in the ground state electronic configuration of Fe+3 ion

Q. What is the difference between half filled and partially filled orbital ?

Q. How to explain the shape of molecules using VSEPR theory?

Q. How many bonds in $XeO{F}_4$ possess an angle greater than ${90}^{\circ }$ ?

Q.

What is the hybridization of sulfur dioxide?

Q. What is the structure of the $BeC{l}_2$ molecule in a gaseous and solid state?

Q. What is the effect of lone pair on bond length?

Q. At ${25}^{o}C$ 1 mole of butane is heated, then $C{O}_{2}and{H}_{2}O$ liquid is formed, work done is

1. 75.6 L atm
2. 85.6 L atm
3. 50.3 L atm
4. None of these

Q.

The molecular formula of sodium ethoxide is ________.

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$

2. ${\mathrm{NaOCH}}_2\mathrm{OH}$

3. ${\mathrm{NaOCH}}_3$

4. None of these

Q. Which of these is/are positively charged ligand(s)?

1. $NO$
2. $N{O}^{+}$
3. $H_{2}O$
4. None of the above

Q. Which of the following compounds will show cis-trans isomerism?
(i) ${\left(C{H}_3\right)}_{2}C=CH-C_2{H}_5$
(ii) $C{H}_2=CB{r}_2$
(iii) $C_6{H}_{5}CH=CH-C{H}_3$
(iv) $C{H}_{3}CH=CClC{H}_3$

Q. What is the Xe- O bond order is perxenate ion $\left(Xe{O}_6^{4-}\right)$?

Q.

An organic compound containing C, H, Cl and O on analysis was found to contain $\mathrm{C}=43.98\%,\mathrm{H}=2.09\%$ and $\mathrm{Cl}=37.18\%$. What is the formula of the compound?

Q.

Name the following

An inert gas which contains triple bond

Q. Give reasons for the following:

A) Covalent bonds are directional bonds while ionic bonds are non- directional.

Give reasons for the following:

B) Water molecule has bent structure whereas carbon dioxide molecule is linear.

Give reasons for the following:

C) Ethyne molecule is linear

Q.

Electrons occupy the degenerate orbitals with parallel spins. How can you justify this statement with respect to stability?

Q. How do 1s, 2s&3s differ from each other?

Q.

Name the following

A vital gas that contains double bond