A sample solution contains two unknown ions. A student did a series of tests on the solution, in the order listed below. If a precipitate formed at any stage, the mixture was filtered and further tests were done on the filtrate. The results are as follows. First test: Second test: Third test: Fourth test: solution is a blue-green colour NaBr(aq) is added and a precipitate forms flame colour is violet NaClO4(aq) is added and no precipitate forms Two possible ions that the solution contains are

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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A sample solution contains two unknown ions. A student did a series of tests on the solution, in the order listed below. If a precipitate formed at any stage, the mixture was filtered and further tests were done on the filtrate. The results are as follows.

First test:
Second test:
Third test:
Fourth test:
solution is a blue-green colour
NaBr(aq) is added and a precipitate forms
flame colour is violet
NaClO4(aq) is added and no precipitate forms

Two possible ions that the solution contains are
 
a.lead(II) and potassium
 
b.copper(I) and cesium
 
c.lead(II) and rubidium

d.copper(I) and potassium

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