Exam Details
| Subject | Inorganic Chemistry | |
| Paper | ||
| Exam / Course | Bachelor Degree Programme(Elective Course: Chemistry) | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
Ni has electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d8 4s2
but Cu has electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d10 481.
Why is it so?
The radius of the first orbit of hydrogen atom is 53 pm. What would the radius of the third orbit be
Will the following molecules absorb in the microwave region? SO2, N2
Draw a plot of w and w^2 for n state of a particle in a one-dimensional box.
An organic compound has Amax 480 nm. The absorbance of its solution 132 mg was found to be 0.560. If an unknown solution of this compound gave an absorbance of 0.750, calculate its concentration. (Do not change the concentration unit.)
For SF6 molecule, give the following:
Hybridisation of S atom
Shape of SF6 molecule
3. Answer any two parts of the following:
What is meant by the half life period of a radioactive nuclide? The 1:Cj1:C ratio in a deeply buried fossil is only 0'25 times that in a living plant. How old is the fossil for 146C 5720 years)
On the basis of VSEPR theory predict the shape of anyone of the following:
C02
XeF2
Calculate the frequency of the radiation required to eject photoelectrons at a velocity of 9 x 10^5 from sodium metal surface, having a threshold frequency of 4·61 x 10^14 Hz.
4. Answer any two parts of the following:
State the selection rules for a harmonic vibration transition and for an an harmonic vibration transition.
Calculate the normal modes of vibration for any two of the following molecules:
CO2, SO2 and CHCl3
Predict the shapes of BF3 and NH3 molecules on the basis of VSEPR theory. Will the dipole moment values of the two be different? Justify your answer.
Calculate the ionic character in HCI molecule for which the observed dipole moment is 3·57 x 10^-30 Cm and the bond length is 127·5 pm.
On the basis of molecular orbital theory, compare 02, 02- and with respect to their bond order and magnetic behaviour.
Draw the molecular orbital energy level diagram for NO molecule.
On the basis of the above, calculate the bond order and predict the magnetic behaviour ofNO molecule.
Write the electronic configuration of the atom whose atomic number is 24.
Arrange and H-in the order of increasing atomic radius.
Which one of Be and B has higher first ionisation energy
Which one of and Ca2+ is a poor complexing agent?
Which one of LiAlH4 and NaBH4 is a more selective reducing agent?
Which one of Li+ and Cs+ has a higher ionic conductance in aqueous solution?
Which one of the following is a covalent hydride? SiH4, TiH4 and CaH2
(viii) Which one of N20 and N20 5 is acidic in nature?
Which one is more stable, Cr2+ or
Give the shape of [SiFf)l2-ion.
Write the formula of hexaamminecobalt(III) chloride.
Name the most electronegative element in the periodic table.
(xiii) Which one of Ti3+ and Ti4+ will produce a coloured solution in water?
Which one of CaO and ZnO is amphoteric in nature?
2. Answer any five of the following:
Explain the difference in the type of hydrogen bonding in ortho-nitrophenol and para-nitrophenol.
Lithium carbonate is thermally unstable whereas other alkali metal carbonates are thermally stable. Explain.
Why are the inter-halogen compounds more reactive than the halogens
Explain why the chemical properties of isomers of hydrogen are similar.
Why do alkali metals in liquid ammonia act as strong reducing agents?
Why cannot boron expand its coordination number beyond four?
Alkaline nature of hydroxides of Group 1 elements increases as we go down the group. Explain.
Answer any three of the following:
Why is 80a not dissolved in water directly during the preparation of sulphuric acid?
Why cannot CC14 be hydrolysed whereas 8iC14 can be hydrolysed easily?
SiO2 is a solid whereas CO2 is a gas at room temperature. Explain.
Why does NHa act as a Lewis base?
PbBr4 and PbI4 do not exist. Explain.
Complete any four of the following chemical equations:
3B2H6 6 NH3 475K
NH4Cl NaNH2
NCl3+3H20
SnCl2 2 FeCl3
Cl2 H2S
Amongst NHg, PHg, AsHg, SbHg and BiHg
which one is thermally least stable?
which one has the highest melting point?
which one is the most basic?
which one has the smallest bond angle?
Answer any two of the following:
Discuss the nature of bonding in diborane.
Explain the structure and magnetic behaviour of [NiCl4]2- on the basis of Valence Bond theory. (Atomic number of Ni is 28)
Name the peroxo acids of sulphur. How will you differentiate between them
Why are zinc and cadmium soft metals?
Write the structures of geometrical isomers of [CO(NH3)4 Cl2]+.
Give the reasons for the late discovery of noble gases.
Write the chemical equations for the reduction of TiCl4 to Ti by Kroll's process.
What are inner transition elements?
What are transition elements? Why are they so called?
As compared to the lanthanide ions, the actinide ions have a greater tendency to form complexes. Explain.
1s2 2s2 2p6 3s2 3p6 3d8 4s2
but Cu has electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d10 481.
Why is it so?
The radius of the first orbit of hydrogen atom is 53 pm. What would the radius of the third orbit be
Will the following molecules absorb in the microwave region? SO2, N2
Draw a plot of w and w^2 for n state of a particle in a one-dimensional box.
An organic compound has Amax 480 nm. The absorbance of its solution 132 mg was found to be 0.560. If an unknown solution of this compound gave an absorbance of 0.750, calculate its concentration. (Do not change the concentration unit.)
For SF6 molecule, give the following:
Hybridisation of S atom
Shape of SF6 molecule
3. Answer any two parts of the following:
What is meant by the half life period of a radioactive nuclide? The 1:Cj1:C ratio in a deeply buried fossil is only 0'25 times that in a living plant. How old is the fossil for 146C 5720 years)
On the basis of VSEPR theory predict the shape of anyone of the following:
C02
XeF2
Calculate the frequency of the radiation required to eject photoelectrons at a velocity of 9 x 10^5 from sodium metal surface, having a threshold frequency of 4·61 x 10^14 Hz.
4. Answer any two parts of the following:
State the selection rules for a harmonic vibration transition and for an an harmonic vibration transition.
Calculate the normal modes of vibration for any two of the following molecules:
CO2, SO2 and CHCl3
Predict the shapes of BF3 and NH3 molecules on the basis of VSEPR theory. Will the dipole moment values of the two be different? Justify your answer.
Calculate the ionic character in HCI molecule for which the observed dipole moment is 3·57 x 10^-30 Cm and the bond length is 127·5 pm.
On the basis of molecular orbital theory, compare 02, 02- and with respect to their bond order and magnetic behaviour.
Draw the molecular orbital energy level diagram for NO molecule.
On the basis of the above, calculate the bond order and predict the magnetic behaviour ofNO molecule.
Write the electronic configuration of the atom whose atomic number is 24.
Arrange and H-in the order of increasing atomic radius.
Which one of Be and B has higher first ionisation energy
Which one of and Ca2+ is a poor complexing agent?
Which one of LiAlH4 and NaBH4 is a more selective reducing agent?
Which one of Li+ and Cs+ has a higher ionic conductance in aqueous solution?
Which one of the following is a covalent hydride? SiH4, TiH4 and CaH2
(viii) Which one of N20 and N20 5 is acidic in nature?
Which one is more stable, Cr2+ or
Give the shape of [SiFf)l2-ion.
Write the formula of hexaamminecobalt(III) chloride.
Name the most electronegative element in the periodic table.
(xiii) Which one of Ti3+ and Ti4+ will produce a coloured solution in water?
Which one of CaO and ZnO is amphoteric in nature?
2. Answer any five of the following:
Explain the difference in the type of hydrogen bonding in ortho-nitrophenol and para-nitrophenol.
Lithium carbonate is thermally unstable whereas other alkali metal carbonates are thermally stable. Explain.
Why are the inter-halogen compounds more reactive than the halogens
Explain why the chemical properties of isomers of hydrogen are similar.
Why do alkali metals in liquid ammonia act as strong reducing agents?
Why cannot boron expand its coordination number beyond four?
Alkaline nature of hydroxides of Group 1 elements increases as we go down the group. Explain.
Answer any three of the following:
Why is 80a not dissolved in water directly during the preparation of sulphuric acid?
Why cannot CC14 be hydrolysed whereas 8iC14 can be hydrolysed easily?
SiO2 is a solid whereas CO2 is a gas at room temperature. Explain.
Why does NHa act as a Lewis base?
PbBr4 and PbI4 do not exist. Explain.
Complete any four of the following chemical equations:
3B2H6 6 NH3 475K
NH4Cl NaNH2
NCl3+3H20
SnCl2 2 FeCl3
Cl2 H2S
Amongst NHg, PHg, AsHg, SbHg and BiHg
which one is thermally least stable?
which one has the highest melting point?
which one is the most basic?
which one has the smallest bond angle?
Answer any two of the following:
Discuss the nature of bonding in diborane.
Explain the structure and magnetic behaviour of [NiCl4]2- on the basis of Valence Bond theory. (Atomic number of Ni is 28)
Name the peroxo acids of sulphur. How will you differentiate between them
Why are zinc and cadmium soft metals?
Write the structures of geometrical isomers of [CO(NH3)4 Cl2]+.
Give the reasons for the late discovery of noble gases.
Write the chemical equations for the reduction of TiCl4 to Ti by Kroll's process.
What are inner transition elements?
What are transition elements? Why are they so called?
As compared to the lanthanide ions, the actinide ions have a greater tendency to form complexes. Explain.
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