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| Metal ion | Colour |
|---|---|
| $A. V^{4+}$ | $I. Colourless$ |
| $B. Ti^{3+}$ | $II. Purple$ |
| $C. Ti^{4+}$ | $III. Green$ |
| $D. Ni^{2+}$ | $IV. Blue$ |
| $V. Yellow$ |
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