CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 7(c)
Classify the acid/base character of the Group IV dioxides and explain how it relates to the type of bonding.
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- 7(a)Describe the trend in electrical conductivities of Group IV elements and relate it to their physical structure.[2 marks]
- 7(b)(i)State the type of bonding found in CO2.[1 mark]
- 7(b)(ii)State the type of bonding found in SiO2.[1 mark]
- 7(b)(iii)State the type of bonding found in GeO2.[1 mark]
- 7(b)(iv)State the type of bonding found in PbO2.[1 mark]
- 7(d)Use the provided standard electrode potentials to comment on the relative stability of the +4 and +2 oxidation states of Ge, Sn, and Pb.[2 marks]
- 7(e)Explain why Sn2+ ions will reduce orange Cr2O7^2- to green Cr3+ but Pb2+ ions will not, referencing standard electrode potentials and using suitable…[4 marks]
- 7(f)Explain why silicon tetrachloride (SiCl4) fumes and forms a white precipitate with water while carbon tetrachloride (CCl4) is immiscible with water, and write…[4 marks]
More practice: the rest of this paper · more Acidic and Basic Character of Organic Compounds questions · all CAPE Chemistry Unit 2 past papers