A substance responds to the following test `:`
`(a)` It gives a green precipitate with ammonia solution which dissolves in excess reagent forming deep blue solution.
`(b)` it gives green precipitate with potassium cyanide solution which dissolves in excess reagent forming a yellow solution.
`(c )` It gives green a reddish`-` brown`//` brown `-` borax bead test in the oxidising flame.
The substance is `:`

Options

A. `Sr^(2+)` salt
B. `Ni^(2+)` salts
C. `Mn^(2+)` salts
D. `Zn^(2+)` salts

Explanation

To solve the problem step by step, we will analyze each test given in the question and identify the substance based on the reactions described.

### Step 1: Analyze the first test
The first test states that the substance gives a green precipitate with ammonia solution, which dissolves in excess reagent to form a deep blue solution.

- **Reaction**: Nickel ions (Ni²⁺) react with ammonia (NH₃) to form nickel hydroxide (Ni(OH)₂), which is green in color.
- **Further Reaction**: When excess ammonia is added, the nickel hydroxide dissolves to form a complex ion, [Ni(NH₃)₆]²⁺, which is deep blue in color.

### Step 2: Analyze the second test
The second test indicates that the substance gives a green precipitate with potassium cyanide solution, which dissolves in excess reagent to form a yellow solution.

- **Reaction**: Nickel ions (Ni²⁺) react with potassium cyanide (KCN) to form nickel cyanide (Ni(CN)₂), which is green.
- **Further Reaction**: When excess KCN is added, it forms a complex ion, K₂[Ni(CN)₄], which is yellow in color.

### Step 3: Analyze the third test
The third test states that the substance gives a green reddish-brown or brown borax bead test in the oxidizing flame.

- **Reaction**: Nickel ions (Ni²⁺) give a characteristic color when heated in a borax bead in an oxidizing flame. The color observed is typically a reddish-brown or brown, confirming the presence of nickel.

### Conclusion
Based on the results from all three tests, we can conclude that the substance is **Nickel (Ni)**.

### Final Answer
The substance is Nickel (Ni).

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