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Module I

Answer ALL questions.

Write your answers in the spaces provided in this booklet.

1. (a) (i) Students are given five test tubes containing either water, 0.25% sucrose solution, DO NOT WRITE IN THIS AREA
1% sucrose solution, 1% glucose solution or starch solution. They perform tests for
reducing sugar, non-reducing sugar and starch. By the end of the experiment, all the
labels have fallen off the test tubes.

Given the results in Table 1, identify the solution that is in EACH test tube and give
a reason for answer.

TABLE 1: RESULTS OF TESTS

Test Tube Benedict’s solution Benedict’s solution, dilute Iodine Test
Number HCL, Sodium Bicarbonate

1 Remains blue Blue-green colour change Yellow-brown colour DO NOT WRITE IN THIS AREA

2 Blue-green-yellow- Blue-green-yellow-orange Yellow-brown colour
orange colour colour change
change
3 Remains blue Blue-green-yellow-orange Yellow-brown colour
colour change
4 Remains blue Remains blue Yellow-brown colour

5 Remains blue Remains blue Blue-black colour

Test Tube 1 ........................................................................................................................

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Test Tube 2 ........................................................................................................................ DO NOT WRITE IN THIS AREA

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