University of Delhi 2005-2nd Year B.Sc Chemistry IV Inorganic Year : - Question Paper

Q.I. discuss any 7 of the following:
(i) Chlorine is a stronger oxidizing agent than Iodine.
(ii) PC1S exists but PH5 does not.
(iii) CO2 is a gas while SiO2 is a high melting solid.
(iv) Graphite is a lubricant and a good conductor of
(v) The solubility of group II sulphates reduces as we go down the group.
(vi) Alkali metals are photoconductors.
(vii) Nitric oxide (NO) is paramagnetic.
(viii) NF3 is extremely stable whereas NC13 is easily hydrolysed.
(ix) Sn (II) is a strong reducing agent.

Q.2. (a) What is roasting? provide examples of ores which are roasted. What is Autoreduction ?
(b) provide the Mond’s process for Nickel extraction and purification.

Q. 3. (a) Draw a neat diagram and discuss zone refining. 3
(b) How is sulphur dioxide prepared ? Illustrate with 1 example each, its oxidizing and reducing character. explain its structure.

Q. 4. define the preparation, properties and structure of Borazine. Why is it called inorganic benzene ?

Q. 5. (a) elaborate interhalogen compounds? How are they various from the parent halogens ?
(b) provide the structure of AX3, AX5 and AX7 kinds of compounds as discussed by the VSEPR Theory.

Q.6. (a) explain the nomenclature of oxyacids of phosphorous. Draw the structures of 4 such acids.
(b) Draw the structures of the oxyacids of Chlorine and discuss their relative acidic character.

Earning:   Approval pending.