Predict which one of the following compounds would be coloured - VCE - SSCE Chemistry - Question 6 - 2007 - Paper 1
Question 6
Predict which one of the following compounds would be coloured.
A. BaSO₄
B. AlPO₄
C. KClO₄
D. NaMnO₄
Worked Solution & Example Answer:Predict which one of the following compounds would be coloured - VCE - SSCE Chemistry - Question 6 - 2007 - Paper 1
Step 1
A. BaSO₄
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Answer
Barium sulfate (BaSO₄) is generally a white solid. It does not have unpaired electrons and is not colored.
Step 2
B. AlPO₄
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Answer
Aluminum phosphate (AlPO₄) is typically white as well and does not exhibit color due to the absence of unpaired d-electrons.
Step 3
C. KClO₄
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Answer
Potassium perchlorate (KClO₄) is a colorless solid. It also lacks unpaired electrons, hence is not colored.
Step 4
D. NaMnO₄
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Answer
Sodium manganate (NaMnO₄) contains Mn in a +7 oxidation state. Manganese compounds in this oxidation state typically exhibit a deep green to purple color due to the presence of d-electrons, resulting in color.
