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CAIE IGCSE Chemistry 8.4.1 Transition Elements As Metals That Questions

Work through real CAIE IGCSE Chemistry questions to identify transition elements and distinguish their characteristic physical and chemical properties.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify transition elements from Periodic Table position and physical properties
  • recall high density, high melting point and malleability of transition elements
  • identify catalytic activity and coloured compounds as typical transition-element properties
  • distinguish transition-element behaviour from Group I, Group VII and zinc properties

CAIE IGCSE Chemistry 8.4.1 Transition Elements As Metals That Questions question 1

[Maximum number: 1]

Hydrogen iodide thermally decomposes into iodine and hydrogen. The reaction is reversible.

2HI( g) colourless gas →⇌I2( g) purple gas +H2( g) colourless gas \underset{\text { colourless gas }}{2 \mathrm{HI}(\mathrm{~g})} \rightarrow \underset{\substack{\mathrm{I}_{2}(\mathrm{~g}) \\ \text { purple gas }}}{\rightleftharpoons}+\underset{\substack{\mathrm{H}_{2}(\mathrm{~g}) \\ \text { colourless gas }}}{ }

Fig. 4.1 shows a gas syringe containing a mixture of hydrogen iodide, iodine and hydrogen gases. The gas syringe is sealed and the mixture is heated to 300∘C300^{\circ} \mathrm{C}. The mixture of gases reaches equilibrium and is purple.

Fig. 4.1

Fig. 4.1

Methanol is manufactured by reacting carbon monoxide with hydrogen.

CO( g)+2H2( g)⇌CH3OH( g)\mathrm{CO}(\mathrm{~g})+2 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_{3} \mathrm{OH}(\mathrm{~g})

The rate of formation of methanol increases when a catalyst is used.

Choose from the list the element that is most likely to be used as the catalyst.

Draw a circle around your chosen answer.
calcium carbon copper sodium sulfur

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