JEE Main 2026 Chemistry question

Among Fe²⁺, Fe³⁺, Cr²⁺ and Zn²⁺, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

Answer: (D)

Solution

Zn²⁺ (d¹⁰) gives a colourless bead (negative test), so it is excluded. Among the remaining coloured-bead ions,

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Question ID VK-015179