CH 3503/CH 4501 – MAIN GROUP ELEMENTS & SOLID STATE CHEMISTRY

Date : 05/11/2012 Dept. No. Max. : 100 Marks

Time : 9:00 – 12:00

PART A

Answer ALL the questions: (10×2=20)

Mention any two oxides of the alkali metals.
Explain the action of water on Na. Give the reaction.
What is hydro oration rraction?
Define catenation.
How is sodium bismuthate prepared? Mention its use.
List the oxyacids of nitrogen.
What are pseudohalogens?
Give the structure of BrF₃
If the radius ration is 0.85. Determine the coordination number and geometry of the crystal.
Draw the unit cell of C_s

PART B

Answer any EIGHT questions: (8×5=40)

Write briefly on crown ethers.
Discuss the preparation, Chemical properties and uses of hydrazine.
Explain the bonding of diborane.
Discuss the classification of carbides.
Explain limiting radius ration. How is it used to determine the geometry of the crystal?
Discuss the principle of X-ray diffraction.
The strength of the oxy acids of halogens are of the order HXO₄>HXO₃>HXO₂>HOX. Give reason.
How are the following prepared? Give the Chemical reaction involved.
Chlorine dioxide b) Oxygen difluoride c) Iodine pentoxide
What is superphosphate of lime? Give its preparation.
Write a brief note on the organomettalic compounds of Li and Be.
What is borax bead test? Explain.
a) List the oxyacids of phosphorous.
Write briefly on sulphides of phosphorous.

PART C

Answer any FOUR questions: (4×10=40)

What are silicates? Discuss the classification with an example each.
Give a comparative account of the oxides, carbonates, hydroxides and halides of alkali metals.
What are crystal defects? Discuss the Schottky and Frenkel defects of crystals.
How are oxides classified? Explain giving an example each.
Discuss the crystal structure of sodium chloride and Zinc sulphide.
How is available chlorine in bleaching powder estimated? Explain.

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