`PH_(3)` can be formed in

Options

A. hydrolysis of calcium phosphide
B. heating `H_(3)PO_(3)`
C. reaction of `P_(4)` & NaOH in inert atmosphere
D. All

Answer

To determine how phosphine (PH₃) can be formed, we will analyze three different reactions provided in the question.

### Step-by-Step Solution:

1. **Identify the reactions**: We have three reactions to analyze for the formation of phosphine (PH₃).

2. **First Reaction - Hydrolysis of Calcium Phosphide**:
- **Reaction**: Ca₃P₂ + 6H₂O → 3Ca(OH)₂ + 2PH₃
- **Analysis**: In this reaction, calcium phosphide reacts with water to produce calcium hydroxide and phosphine.
- **Conclusion**: This reaction produces PH₃, so it is a valid method for forming phosphine.

3. **Second Reaction - Heating Phosphorous Acid (H₃PO₃)**:
- **Reaction**: 4H₃PO₃ → H₃PO₄ + 3PH₃
- **Analysis**: When phosphorous acid is heated, it decomposes to form phosphoric acid and phosphine.
- **Conclusion**: This reaction also produces PH₃, making it another valid method for forming phosphine.

4. **Third Reaction - Reaction of P₄ with NaOH in Inert Atmosphere**:
- **Reaction**: P₄ + 4NaOH + 2H₂O → 4NaH₂PO₂ + 2PH₃
- **Analysis**: In this reaction, tetraphosphorus reacts with sodium hydroxide and water in an inert atmosphere to produce sodium hypophosphite and phosphine.
- **Conclusion**: This reaction also produces PH₃, confirming that it is a valid method for forming phosphine.

5. **Final Conclusion**: Since all three reactions lead to the formation of phosphine (PH₃), we conclude that phosphine can be formed from all the provided reactions.