A-LevelChemistryGroup 179701/12 · Oct/Nov 2015 · Q181 Mark

A white powder is a mixture of sodium chloride and sodium iodide. It is dissolved in water in a test-tube. Excess aqueous silver nitrate is added to the test-tube. A precipitate, X, is observed. Excess concentrated ammonia is then added to the test-tube containing X. After the test-tube has been shaken, a precipitate, Y, is observed. Which statement about X or Y is correct?

AX is a pure white colour.

BX is pure silver iodide.

CY is pure silver chloride.

DY is yellow.

✓ Correct answer

D: Y is yellow.

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 2, question 18.

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