In which of the following sets are all the compounds likely to be coloured?
A - VCE - SSCE Chemistry - Question 16 - 2003 - Paper 1
Question 16
In which of the following sets are all the compounds likely to be coloured?
A. KCIO₄, FeCl₃, NH₄VO₃
B. Ca₃(PO₄)₂, NH₄VO₃, MgBr₂
C. FeCl₃, NiCl₂, K₂Cr₂O₇
D. KCIO₄, Mg... show full transcript
Worked Solution & Example Answer:In which of the following sets are all the compounds likely to be coloured?
A - VCE - SSCE Chemistry - Question 16 - 2003 - Paper 1
Step 1
A. KCIO₄, FeCl₃, NH₄VO₃
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Answer
KClO₄ is a colorless compound. FeCl₃ is known to be colored due to Fe³⁺ ions. NH₄VO₃ (ammonium vanadate) is colored as well. Therefore, this set is not entirely colored.
Step 2
B. Ca₃(PO₄)₂, NH₄VO₃, MgBr₂
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Answer
Ca₃(PO₄)₂ (calcium phosphate) is usually colorless. NH₄VO₃ is colored. MgBr₂ is also typically colorless. Hence, this set does not consist entirely of colored compounds.
Step 3
C. FeCl₃, NiCl₂, K₂Cr₂O₇
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Answer
FeCl₃ is colored due to Fe³⁺ ions, NiCl₂ is green, and K₂Cr₂O₇ (potassium dichromate) is orange. All compounds in this set are colored.
Step 4
D. KCIO₄, MgBr₂, Ca₃(PO₄)₂
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Answer
KClO₄, MgBr₂, and Ca₃(PO₄)₂ are all typically colorless. Therefore, this set is not composed of colored compounds.
