STATEMENT-1: Ti metal present in Zieglar Natta catalyst
STATEMENT-2: Os with +8 oxidation state exist in `OsF_(8)`
STATEMENT-3: +7 oxidation state is more stable for 4d and 5d elements compared to 3d metal

Options

A. TTT
B. TFT
C. FTT
D. FFT

Answer

To analyze the statements given in the question, let's break down each statement step by step.

### Step 1: Analyzing Statement 1
**Statement 1:** "Ti metal present in Ziegler Natta catalyst."

- The Ziegler-Natta catalyst is indeed a mixture that includes titanium compounds. Specifically, it is made from titanium tetrachloride (TiCl₄) and triethyl aluminum (Al(C₂H₅)₃).
- Since titanium (Ti) is a component of this catalyst, we can conclude that this statement is **true**.

### Step 2: Analyzing Statement 2
**Statement 2:** "Os with +8 oxidation state exists in OsF₈."

- To determine the oxidation state of osmium (Os) in OsF₈, we can set up the equation based on the known oxidation state of fluorine, which is -1.
- The equation would be: x + 8(-1) = 0, where x is the oxidation state of Os.
- Solving this gives us x = +8. However, the existence of OsF₈ is not feasible due to steric hindrance and the instability of such a high oxidation state with eight fluorine atoms.
- Therefore, this statement is **false**.

### Step 3: Analyzing Statement 3
**Statement 3:** "+7 oxidation state is more stable for 4d and 5d elements compared to 3d metal."

- In the 3d series, manganese (Mn) exhibits a +7 oxidation state in compounds like MnO₄⁻. However, this state is less stable compared to the +7 states of technetium (Tc) and rhenium (Re) in the 4d and 5d series, respectively.
- The stability of the +7 oxidation state increases as we move down the transition series from 3d to 4d and 5d. This is due to the increasing nuclear charge and the ability of these heavier elements to stabilize higher oxidation states.
- Thus, this statement is **true**.

### Conclusion
- **Statement 1:** True
- **Statement 2:** False
- **Statement 3:** True

### Final Answer
The correct answer is: Statement 1 is true, Statement 2 is false, Statement 3 is true.

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