Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K ₄ [ Fe ( CN )₆ ] is _____. Cu ²⁺, Fe ³⁺, Ba ²⁺, Ca ²⁺, NH ₄⁺, Mg ²⁺, Zn ²⁺

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Cu ²⁺, Ca ²⁺ & Zn ²⁺ will form precipitate with K ₄ [ Fe ( CN )₆ ] . Fe ³⁺ forms coloured solution

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K ₄ [ Fe ( CN )₆ ] is _____. Cu ²⁺, Fe ³⁺, Ba ²⁺, Ca ²⁺, NH ₄⁺, Mg ²⁺, Zn ²⁺

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