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A metal salt solution when treated with ...

A metal salt solution when treated with dimethyl glyoxime and `NH_(4)OH` give a rose red complex.The metal is

A

`Ni`

B

`Zn`

C

`Co`

D

`Mn.`

Text Solution

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The correct Answer is:
To solve the question, we need to identify which metal salt solution forms a rose red complex when treated with dimethylglyoxime and ammonium hydroxide (NH4OH). ### Step-by-Step Solution: 1. **Understand the Reagents**: - Dimethylglyoxime (DMG) is a reagent used to detect nickel ions (Ni²⁺) in solution. - Ammonium hydroxide (NH4OH) is used to create a suitable environment for the complex formation. 2. **Identify the Complex Formation**: - When dimethylglyoxime is added to a solution containing nickel ions, it forms a complex known as nickel dimethylglyoxime, which is represented as Ni(dmg)₂. - This complex is known for its distinct rose red color. 3. **Consider the Other Metals**: - The question provides options: nickel, zinc, cobalt, and magnesium. - Zinc does not form a colored complex with DMG. - Cobalt forms a different type of complex that is not rose red. - Magnesium does not form a complex with DMG. 4. **Conclusion**: - Since only nickel forms a rose red complex with dimethylglyoxime in the presence of ammonium hydroxide, we conclude that the metal in question is nickel (Ni²⁺). ### Final Answer: The metal is **Nickel (Ni)**.
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