4 marksAcidic and Basic Character of Organic Compounds

CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 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 half-equations.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

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(c)Classify the acid/base character of the Group IV dioxides and explain how it relates to the type of bonding.[4 marks]
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(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