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Identify the pair in which BOTH ions produce a pink colour in their aqueous solutions.

1. (Mn²+, Fe²+)
2. (Mn²+, Co²+)
3. (Ni²+, Co³+)
4. (Cr³+, Mn³+)

Correct answer: (Mn²+, Co²+)

Solution

Mn²+(aq) = pale pink. Co²+(aq) = pink. Fe²+ = pale green (eliminates A). Ni²+ = green (eliminates C). Co³+ is a strong oxidizer, not stable in aqueous solution (eliminates C). Cr³+ = violet/green (eliminates D). Only Mn²+ and Co²+ are both pink.

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