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a2 chem group 4

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A2 Chem Group 4 (14) Candidates should be able to: describe the change in relative stability of oxidation states II and IV down Group 4, as shown by reactions of CO as a reducing agent with oxides and Pb(IV as an oxidising agent in the reaction of PbO !  with concentrated hydrochloric acid" Element Oxidation State II Oxidation State IV C Example CO Example CO 2 Carbon monoxide is an exception C IV  is the stable oxidation state Si II  does not exist under normal Example SiCl 4  SiO 2 Si conditions Si IV  is more stable than Si II Ge Example GeCl 2 Example GeCl 4 Ge II  is less stable than Ge IV Ge IV  is more stable than Ge II Sn Example SnCl 2 Example SnCl 4 Sn II  and Sn IV  have similar stabilities Sn II  and Sn IV  have similar stabilities Example PbCl 2  Pb(NO ! 2 Example PbO 2 Pb Pb II  is more stable than Pb IV Pb II  is more stable than Pb IV

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