MURANGA SOUTH - END TERM 1 - 2025 233/1 CHEMISTRY PAPER 1

MURANGA SOUTH - END TERM 1 - 2025
233/1
CHEMISTRY PAPER 1
1. The set-up below shows the catalytic oxidation of ammonia in the laboratory.
(a) State and explain the observation made.
(2marks)
(b) Write a chemical equation for the first reaction taking place in the conical flask.
(1 mark)
2. When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melts into a golden
yellow mobile liquid at 113°C. The liquid changes at 180°C into a dark brown liquid that is very
viscous. Heating at 400°C produces a brown less viscous liquid.)
(a) Draw the molecular structure of sulphur in the yellow liquid.
(1 mark)
(b) Name two allotropes of sulphur.
(2 marks)
3. Iron (III) oxide was found to be contaminated with copper (II) sulphate. Describe how a pure sample of
iron (III) oxide can be obtained.
(3 marks)
4. Study the diagram below then use it to answer the questions that follow.