There is a large temperature interval between the melting point and the boiling point of metal because:

melting does not break the metallic bond but boiling does

metals have a very high melting point

metals conduct heat very rapidly

melting does not break the metallic bond but boiling does

the crystal lattice of metal is easily broken

Which of the following increases as boiling water changes to steam?

degree of disorder of the system

JAMB UTME - Chemistry - 2022 | Green Bridge CBT

Question 1 Report

$ \mathrm{SO_2 + O_2 \rightarrow 2SO_3} $

In the reaction above, the most suitable catalyst is?

chromium(vi)oxide

iron(iii)oxide

copper(i)oxide

vanadium(v)oxide

Answer Details

The most suitable catalyst for the given reaction is vanadium(V)oxide (V2O5). Vanadium(V)oxide is a commonly used catalyst for the oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3). The reaction is an exothermic reaction, and it occurs at high temperatures (around 450-500°C) in the presence of a catalyst. V2O5 is an effective catalyst for this reaction because it has a high surface area and can provide active sites for the reaction to occur. The vanadium ions in the V2O5 catalyst undergo redox reactions with the sulfur dioxide and oxygen molecules, which promotes the formation of sulfur trioxide. Chromium(VI)oxide and iron(III)oxide are not suitable catalysts for this reaction because they are not effective at promoting the oxidation of sulfur dioxide to sulfur trioxide. Copper(I)oxide can be used as a catalyst for the reaction, but it is not as effective as vanadium(V)oxide.






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