Answer to Question #90017 in Electricity and Magnetism for Vaibhavi Desai

Question

Question 1
Vanadium is a transition element. it has more than one oxidation state. The element and its compounds are often used as catalysts.

(a) Complete the electron distribution of vanadium by inserting one number.

2+8+ .......... +2

(b) Vanadium (V) oxide is used to catalyse the exothermic reaction between sulfur dioxide and oxygen in the Contact Process.

2SO2 + O2 = 2SO3

The rate of this reaction can be increased either by using a catalyst or by increasing the temperature. Explain why a catalyst is used and not a higher temperature.

(c) The oxidation states of vanadium in its compounds are V (+5), V (+4), V (+3) and V (+2). The vanadium (lll) ion can behave as a reductant or an oxidant.

(i) indicate on the following equation which reactant is the oxidant.

2V^3+ + Zn = 2V^2+ + Zn^2+

(ii) which change in the following equation is oxidation?
Explain your choice.

V^3+ + Fe3+ = V^4+ + Fe^2+

Answer 1

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