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 pink colour NaIO3(aq) added and no precipitate forms flame colour is red Na2CO3(aq) is added and no precipitate forms Two possible ions that the solution contains are

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Chapter17: Solubility And Complex-ion Equilibria
Section: Chapter Questions
Problem 17.100QP: A solution contains 0.00740 M calcium ion. A concentrated sodium fluoride solution is added dropwise...
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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 pink colour
NaIO3(aq) added and no precipitate forms
flame colour is red
Na2CO3(aq) is added and no precipitate forms

Two possible ions that the solution contains are
 
a.lithium and manganese(II)
b. strontium and cobalt(II)
c. strontium and manganese(II)
d. lithium and cobalt(II)
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