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Date	May 2017	Marks available	1	Reference code	17M.2.sl.TZ1.3
Level	SL	Paper	2	Time zone	TZ1
Command term	Formulate	Question number	3	Adapted from	N/A

Question

Vanadium, another transition metal, has a number of different oxidation states.

Determine the oxidation state of vanadium in each of the following species.

[2]

Formulate an equation for the reaction between VO²⁺(aq) and V²⁺(aq) in acidic solution to form V³⁺(aq).

[1]

Markscheme

V₂O₅: +5

VO²⁺: +4

Do not penalize incorrect notation twice.

[2 marks]

VO²⁺(aq) + V²⁺(aq) + 2H⁺(aq) → 2V³⁺(aq) + H₂O(l)

Accept equilibrium sign.

[1 mark]

Examiners report

[N/A]

Syllabus sections

Core » Topic 9: Redox processes » 9.1 Oxidation and reduction

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