Ion that gives a colourless compound in the +3 state (Sc3+)

The same question, asked 2 times: 14 May 2024 S1, 15 Apr 2026 S2. Every wording below, oldest first.

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Question 1
14 May 2024 S1
66 $Which among the following cations produces colourless aqueous solution in their respective oxidation state?$
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Question 2
15 Apr 2026 S2
34 $Which of the following elements in +3 oxidation state forms colourless compounds?$
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