Problem 1
Discuss the pattern of variation in the oxidation states of (i) B to Tl and (ii) \(\mathrm{C}\) to \(\mathrm{Pb}\).
Problem 2
How can you explain higher stability of \(\mathrm{BCl}_{3}\) as compared to \(\mathrm{TICl}_{3}\) ?
Problem 3
Why does boron triflouride behave as a Lewis acid?
Problem 5
Is boric acid a protic acid ? Explain.
Problem 6
Explain what happens when boric acid is heated.
Problem 7
Describe the shapes of \(\mathrm{BF}_{3}\) and \(\mathrm{BH}_{4}^{-}\). Assign the hybridisation of boron in these species.
Problem 8
Write reactions to justify amphoteric nature of aluminium.
Problem 9
What are electron deficient compounds ? Are \(\mathrm{BCl}_{3}\) and \(\mathrm{SiCl}_{4}\) electron deficient species? Explain.
Problem 10
Write the resonance structures of \(\mathrm{CO}_{3}^{2-}\) and \(\mathrm{HCO}_{3}^{-}\).
Problem 11
What is the state of hybridisation of carbon in (a) \(\mathrm{CO}_{3}^{2-}\) (b) diamond (c) graphite?
