The following are some statements related to VA group hydrides.
I. Reducing property increases from `NH_(3)` to `BiH_(3)`.
II. Tendency to donate lone pair decreases from `NH_(3)" to "BiH_(3)`.
III. Thermal stability of hydrides decreases from `NH_(3)" to "BiH_(3)`.
IV. Bond angle of hydrides decreases from `NH_(3)" to "BiH_(3)`.
The correct statements are

Options

A. I, II, III and IV
B. I, III and IV
C. I, II and IV
D. I and IV

Explanation

To analyze the statements related to the hydrides of Group VA elements (Nitrogen family), we will evaluate each statement one by one.

### Step 1: Evaluate the Reducing Property
- **Statement I**: "Reducing property increases from NH₃ to BiH₃."
- As we move down the group from NH₃ to BiH₃, the reducing property indeed increases. This is because heavier elements like bismuth have lower electronegativity and can more readily donate electrons.

**Conclusion**: Statement I is **True**.

### Step 2: Evaluate the Tendency to Donate Lone Pair
- **Statement II**: "Tendency to donate lone pair decreases from NH₃ to BiH₃."
- The tendency to donate a lone pair decreases as we move down the group. NH₃ has a strong tendency to donate its lone pair due to the high electronegativity of nitrogen, while BiH₃ has a much lower tendency due to the larger size and lower electronegativity of bismuth.

**Conclusion**: Statement II is **True**.

### Step 3: Evaluate Thermal Stability
- **Statement III**: "Thermal stability of hydrides decreases from NH₃ to BiH₃."
- The thermal stability of these hydrides decreases as we go down the group. NH₃ is quite stable, while BiH₃ is less stable and can decompose at lower temperatures.

**Conclusion**: Statement III is **True**.

### Step 4: Evaluate Bond Angles
- **Statement IV**: "Bond angle of hydrides decreases from NH₃ to BiH₃."
- The bond angle in NH₃ is approximately 107 degrees due to the presence of lone pairs. As we move down to BiH₃, the bond angle decreases due to the larger size of the central atom and the decrease in lone pair repulsion.

**Conclusion**: Statement IV is **True**.

### Final Conclusion
All statements I, II, III, and IV are correct.

### Summary of Correct Statements
The correct statements are:
- I, II, III, and IV.