B.Sc. (Program) Physical Sciences Part II

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B.Sc. (G)/II

CHEMISTRY - Paper IV (Inorganic Chemistry)

Assignment given by Dr.Manisha Jain

Max. Marks: 33

1. Explain any six of the following:

(i) Beryllium compounds are predominantly covalent in nature in contrast to analogous compounds of other alkaline earth metals.

(ii) Thermal stability of alkali metal carbonates decreases down the group.

(iii) In BF3 the B-F bond length is shorter than the sum of covalent radii of boron and fluorine.

(iv) SnI4 is orange coloured solid while CCl4 and SiBr4 are colourless solids.

(v) Trimethylamine is pyramidal while trisilylamine is planar.

(vi) Oxygen exists as O2 while sulphur exists as S8.

(vii) Borazene is termed as inorganic benzene but where benzene is inert towards addition reactions, borazine undergoes addition reactions quite easily.

                                                                            1.5 x 6

2. a. Describe the structures of the following:

PCl3F2 , SO3 , P4O10

                                                                             2 x 3

b. How is nitrous oxide prepared? How does it act as a supporter of combustion.


3. a. Illustrate the hydrolysis followed by condensation of dimeythyldichlorosilane. Write the name of the end product.


b. How is boric acid produced ? Why does it behaves as a weak monobasic acid?


c.Describe the action of water on calcium carbide and sodium hydride separately.


4. A. Complete the following reactions:

a. BaO2 + HCl 

b. LiNO3

c. BCl3 + ROH 

d. NH3 + NaOCl 

                                                                                   1 x 4

B. Compare the following pair of compounds for:

(i) Existence PH5 , PF5

(ii) Basicity KOH, LiOH

                                                                                    2 x 2

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