Q106 · Practice questionComplex familiar1 mark
QUESTION 106
The table records whether a coating forms when each metal is placed in a solution of another metal’s ions. Which metal is the strongest reducing agent?
| Metal added | P²⁺ solution | Q²⁺ solution | R²⁺ solution |
|---|---|---|---|
| P | Not tested | No coating | No coating |
| Q | Coating | Not tested | No coating |
| R | Coating | Coating | Not tested |
(A)
P
(B)
Q
(C)
The three metals have equal reducing strengths.
(D)
R
WORKED SOLUTION
1 markAnswer D
Answer
D
Working
R displaces both P and Q from their ion solutions and is therefore most readily oxidised. Q displaces P, but P displaces neither. Reducing strength: R > Q > P.
Marking criteria
- Select D. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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