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CBSE Class 11 2019 : Chemistry : p block

3 pages, 71 questions, 4 questions with responses, 4 total responses,    1    0
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11.1 Discuss the pattern of variation in the oxidation states of (i) B to Tl and (ii) C to Pb. 11.2 How can you explain higher stability of BCl3 as compared to TlCl3 ? 11.3 Why does boron triflouride behave as a Lewis acid ? 11.4 Consider the compounds, BCl3 and CCl4. How will they behave with water ? Justify. 11.5 Is boric acid a protic acid ? Explain. 11.6 Explain what happens when boric acid is heated . 11.7 Describe the shapes of BF3 and BH4 . Assign the hybridisation of boron in these species. 11.8 Write reactions to justify amphoteric nature of aluminium. 11.9 What are electron deficient compounds ? Are BCl3 and SiCl4 electron deficient species ? Explain. 11.10 Write the resonance structures of CO3 2 and HCO3 11.11 What is the state of hybridisation of carbon in (a) CO3 (b) diamond (c) graphite? 11.12 Explain the difference in properties of diamond and graphite on the basis of their structures. 11.13 Rationalise the given statements and give chemical reactions : Lead(II) chloride reacts with Cl2 to give PbCl4. Lead(IV) chloride is highly unstable towards heat. Lead is known not to form an iodide, PbI4. 11.14 Suggest reasons why the B F bond lengths in BF3 (130 pm) and BF4 (143 pm) differ. 11.15 If B Cl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment. 11.16 Aluminium trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF3 is bubbled through. Give reasons. 11.17 Suggest a reason as to why CO is poisonous. 11.18 How is excessive content of CO2 responsible for global warming ? 11.19 Explain structures of diborane and boric acid. 11.20 What happens when (a) Borax is heated strongly, (b) Boric acid is added to water, (c) Aluminium is treated with dilute NaOH, (d) BF3 is reacted with ammonia ? 11.21 Explain the following reactions (a) Silicon is heated with methyl chloride at high temperature in the presence of copper; (b) Silicon dioxide is treated with hydrogen fluoride; (c) CO is heated with ZnO; (d) Hydrated alumina is treated with aqueous NaOH solution.

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