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Question

The test of which of the following anions is not performed in a glass test tube?

A
F
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B
AsO34
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C
PO34
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D
BO33
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Solution

The correct option is B F
The test for fluoride ions is not performed in a glass test tube.
The fluoride ions attack silicates as well as silica as indicated in the following reactions.
SiO2+4FSiF4+4OH
CaSiO3+6FCaSiF4+6OH

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