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1. Discuss the pattern of variation in the oxidation states of
(i) B to Tl and
(ii) C to Pb.
2. How can you explain higher stability of as compared to?
3. Why does boron trifluoride behave as a Lewis acid?
4. Consider the compounds,. How will they behave with water? Justify.
5. Is boric acid a protic acid? Explain.
6. Explain what happens when boric acid is heated.
7. Describe the shapes of . Assign the hybridisation of boron in these species.
8. Write reactions to justify amphoteric nature of aluminium.
9. What are electron deficient compounds? Are and electron deficient species? Explain.
10. Write the resonance structures of and .
11. What is the state of hybridisation of carbon in (a) (b) diamond (c) graphite?
12. Explain the difference in properties of diamond and graphite on the basis of their structures.
13. Rationalise the given statements and give chemical reactions:
(a) Lead(II) chloride reacts with to give .
(b) Lead(IV) chloride is highly unstable towards heat.
(c) Lead is known not to form an iodide, .
14. Suggest reasons why the B-F bond lengths in (130 pm) and (143 pm) differ.
15. If B-Cl bond has a dipole moment, explain why BCl3molecule has zero dipole moment.
16. Aluminium trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous is bubbled through. Give reasons.
17. Suggest a reason as to why CO is poisonous.
18. How is excessive content of responsible for global warming?
19. Explain structures of diborane and boric acid.
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