Dibrugarh University Question Papers: Inorganic Chemistry - (Inorganic, Physical and Organic)' 2016

1. Which of the following ions is paramagnetic in nature?

1. Zn2+
2. Cu2+
3. CI-
4. Sc2+

2. Which of the following compounds is non-polar?

1. H2O
2. NH3
3. BCI3
4. HCI

3. The hybridization involved in H2O is

1. Sp2
2. Sp3
3. Sp3d
4. Sp3d2

1. Among halogens, CI has the highest electron affinity. Explain.
2. Predict the structure of XeF6 molecule using VSEPR theory.
3. What is lattice energy? How lattice energy controls the solubility of ionic.

1. Define hydrogen bonding. The density of water is maximum at 4 0C. Explain. 1+2=3
2. Write down the electronic configurations of the following ions: 1+1+1=3

1. Ti2+
2. S2-
3. Co2+

3. What is the linear combination of atomic orbital (LCAO)? Show with the help of LCAO the formation of bonding and anti-bonding molecular orbital’s formed by 2p-orbital. 1+2=3

1. What is electronegativity? Write briefly about Allred-Rochow scale of electronegativity. 1+2=3
2. What is hybridization? Give example of each of sp2 and sp3d2 hybridization. 1+2=3
3. What is polarizing power of a cation in ionic compound? Among the halides of sodium, which one is most covalent and why? 1+2=3
4. Write down the molecular orbital configuration of O2. Find its bond order and mention its magnetic property. 1+1+1=3

1. Effective nuclear charge.
2. Resonance energy.

1. The ratio of the root-mean-square speed of H2 at 50 K and that of O2 at 800 K is

1. 4
2. 2
3. 1
4. 1/4

2. The vapour pressure of a liquid does not depend on which of the following factors?

1. Temperature.
2. Density.
3. Presence of solute.
4. Intermolecular attraction of liquid molecules.

3. The crystal defect which may occur in NaCI crystal is

1. Frenkel defect.
2. Schottky defect.
3. Impurity defect.
4. None of the above.

1. Axis of symmetry.
2. Schottky defect.

1. Which of the following is the correct increasing order of their acidity?

1. 
2. 
3. 
4. 

2. Which of the following carbanions is most stable?

1. 
2. 
3. 
4. 

3. Which of the following isomerism is shown by the lactic acid?

1. Geometrical isomerism.
2. Tautomerism.
3. Optical isomerism.
4. None of the above.

4. In ethane molecule, the hybridizing state of both the C-atoms are

1. Sp3
2. Sp
3. Sp2
4. None of the above

1. Define nucleophile and electrophiles. Give one example of each.
2. Define inductive effect. “Formic acid is stronger than acetic acid.” Explain with the help of inductive effect.
3. Write down the necessary conditions for an organic molecule to show geometrical isomerism.
4. Define carbene. How is it classified?

1. With the help of Newman projection formula, draw the possible conformations of n-butane molecule and give their names. Which is the most stable conformation of n-butane?
2. Assign R- or S-configuration of the following:

1. 

2. 

3. 

3. Draw the possible geometrical isomers of the following and assign them with E or Z:

1. 
2. 
3. 

4. Write short notes on the following:

1. Plane symmetry.
2. Centre of symmetry.

5. Define hyperconjugation. With the help of it, show that but-2-ene is more stable than but-1-ene.

1. Which of the following orbital is not possible?

1. 2p
2. 4d
3. 6s
4. 3f

2. Which of the following bonds is non-polar?

1. O – H
2. CI – CI
3. C – H
4. H – F

3. The hybridization of S in SF6 is

1. Sp3
2. Sp3d2
3. Sp3d
4. Sp2

1. The second ionization energy of an element is more than first ionization energy. Explain.
2. Explain the shape of from VSEPR theory.
3. The atomic number of four elements are 9, 11, 21 and 36

1. Which one of them has the lowest ionization energy?
2. Which one of them has the highest electron affinity?

1. What is Pauli’s exclusion principle? Explain with suitable example. 1+2=3
2. Write down the possible resonating structures of the following ions: 1+1+1=3

3. Write down the molecular orbital configuration of ion. Find its bond order and mention its magnetic character. 1+1+1=3

1. Write down the electronic configuration of the following:

2. What is Fajans’ rule? Among the following, which one is most ionic and why?

3. Write down the molecular orbital diagram of N2. Find its bond order and mention its magnetic properties. 3+1=4

1. Hund’s rule.
2. Resonance.

1. With the increase of temperature, the viscosity of a liquid

1. Increases.
2. Decreases.
3. Remains same.
4. First increases and then decreases.

2. The number of atoms present in a unit cell of body-centred cubic lattice is

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

3. The molecule having highest root-mean-square velocity at 27 0C is

1. CO2
2. CH4
3. O2
4. NH3

1. (i) Derive Boyle’s law from kinetic gas equation. 2½

2. (i) Deduce the equation of corresponding states. 3

3. (i) What is critical phenomenon? Derive the expressions for the critical constants of a gas using van der Waals’ equation. 4

1. Explain the laboratory method for the determination of surface tension of a liquid. 2½
2. Define parachor. If the parachor values of butane and – CH2 – group are 190.2 and 39 respectively, then find the parachor value of carbon. 2½
3. Write how surface tension and viscosity of a liquid change with temperature. What is the SI unit of surface tension? 2+½=2½

1. (i) Write two differences between amorphous solid and crystalline solid. 2

2. (i) Gold has cubic crystals whose unit cell has an edge length of 407.9 pm. If the density of gold is, calculate the number of atoms in the unit cell of gold. Predict the type of crystal structure of gold. 3

1. Which of the following carbocations is most stable?

1. 
2. 
3. 
4. 

2. Homolytic fission of a covalent bond results in the formation of

1. Free radicals.
2. Carbocations.
3. Carbanions.
4. Carbocation and carbanions.

3. Which of the following compounds can exhibit geometrical isomerism?

1. 
2. 
3. 
4. 

1. Define carbanions. Mention its stability order and reactivity order.
2. Define nitrene. How is it classified?
3. Explain the formation of acetylene molecule with the help of hybridization.
4. Draw the chair conformation of cyclohexane showing equatorial and axial C – H bonds.

1. With the help of Newman projection formula, draw the possible conformations of ethane and give their names.
2. Assign R- or S-configuration of the following:

1. 

2. 

3. Draw the possible geometrical isomers of the following and assign them with E or Z:

1. 
2. 

4. Identify the chiral centres of the following and draw their possible optical isomers with the help of Fischer’s projection formula:

1. 
2. 

5. Complete the following reaction and write down the rule involved in the reaction:

1. State nitration of benzene and discuss the mechanism of the reaction.
2. Convert ethyne into but-1-yne.
3. Prepare propan-1-ol from propane with the help of hydroboration-oxidation reaction.
4. Prepare n-pentane with the help of Corey-House synthesis.

1. 
2. 
3. 
4. 

5.