Formation of `Ni(CO)_(4)` and subsequent its decomposition into Ni and CO makes basis of Mond's process,
`Ni+4CO overset(T_(1))to Ni(CO)_(4) overset(T_(2))to Ni+4CO, T_(1) and T_(2)` are :

Options

A. `100^(@)C, 50^(@)C`
B. `50^(@)C, 100^(@)C`
C. `50^(@)C,230^(@)C`
D. `230^(@),50^(@)C`

Answer

To solve the question regarding the temperatures \( T_1 \) and \( T_2 \) involved in the Mond's process for the formation and decomposition of \( Ni(CO)_4 \), we can follow these steps:

### Step 1: Understand the Mond's Process
The Mond's process is a method used for the purification of nickel. It involves the formation of nickel carbonyl, \( Ni(CO)_4 \), from nickel and carbon monoxide.

### Step 2: Write the Reaction
The reaction for the formation of nickel carbonyl can be written as:
\[ Ni + 4CO \overset{T_1}{\rightarrow} Ni(CO)_4 \]
This indicates that nickel reacts with carbon monoxide at a certain temperature \( T_1 \) to form nickel carbonyl.

### Step 3: Identify the Temperature for Formation
From the knowledge of the Mond's process, the temperature \( T_1 \) required for the formation of \( Ni(CO)_4 \) is approximately 50 °C (or 373 K).

### Step 4: Write the Decomposition Reaction
The decomposition of nickel carbonyl back into nickel and carbon monoxide can be expressed as:
\[ Ni(CO)_4 \overset{T_2}{\rightarrow} Ni + 4CO \]
This indicates that nickel carbonyl decomposes at a higher temperature \( T_2 \) to yield nickel and carbon monoxide.

### Step 5: Identify the Temperature for Decomposition
The temperature \( T_2 \) required for the decomposition of \( Ni(CO)_4 \) is around 230 °C (or 475 K).

### Step 6: Conclusion
Thus, the temperatures \( T_1 \) and \( T_2 \) are:
- \( T_1 = 50 \, °C \)
- \( T_2 = 230 \, °C \)

### Final Answer
The correct option is: **50 °C and 230 °C**.

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