1. Why are alkali metals not found in a free state in nature?
2. Give the reactions involved in Castner - Kellner process?
3. Write about biological importance of Ca & Mg.
4. Write about biological importance of Na+ & K+ ions.
5. Write any two uses of Caustic soda.
6. Why does the solubility of alkaline earth metal hydroxides in water increase down the group?
7. Why is gypsum added to cement?
8. Write any two uses of Sodium Carbonate.
9. Give two uses of Plaster of Paris.
10. Write the average composition of Portland cement.
The p - Block Elements - GROUP - 13 (4 Marks)
Short Answer type Questions
1. What is Borax? Explain the borax bead test with a suitable example.
2. Explain the structure of Diborane.
3. How does diborane react with
a) H2O b) CO c) N(CH3)3 d) NH3, Δ
Very Short Answer type Questions
1. What is inert pair effect? Why TlCl3 has higher stabilility?
2. What is the hybridisation of B in a) diborane and b) borazine?
3. Give the formula and strcuture of borazine. What is its common name?
4. Sketch the structure of orthoboric acid.
5. Can Conc. HNO3 be transported in aluminium container? Why?
GROUP - 14 (4 Marks)- Short Answer type Questions
1. Explain the difference in properties of diamond and graphite on the basis of their
structure?
2. Write a short note on a) Silicates and b) Zeolites.
Very Short Answer type Questions
1. Why is Carbon monoxide poisonous?
2. What is allotropy? Give the crystalline allotropes of Carbon and mention the hybridisation present in them.
3. Why Diamond is hard?
4. Graphite is a good conductor - explain.
5. How does graphite function as a lubricant?
6. SiO2 is solid while CO2 is a gas - explain.
7. Write the use of ZSM − 5.
8. SiF6
−2 is known while SiCl6
−2 is not - explain.
9. CO2 is useful as well as harmful - explain.
10. Diamond has high melting point - explain.
11. What is 'synthesis gas'? How is it prepared?
12. What is 'producer gas'? How is it prepared?
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