The ortho and para forms of hydrogen have ……. and …… spins respectively

Options

A. Parallel, opposite
B. Opposite, parallel
C. Parallel, parallel
D. Opposite, opposite

Answer

To solve the question regarding the ortho and para forms of hydrogen and their respective spins, we will follow these steps:

### Step 1: Understand the Forms of Hydrogen
Hydrogen exists in two forms based on the spins of its nuclei:
- **Ortho hydrogen**: This form has the spins of the two hydrogen nuclei aligned in the same direction.
- **Para hydrogen**: This form has the spins of the two hydrogen nuclei aligned in opposite directions.

### Step 2: Identify the Spin Characteristics
- **Ortho hydrogen**: The spins are **parallel** to each other.
- **Para hydrogen**: The spins are **opposite** to each other.

### Step 3: Fill in the Blanks
Based on the characteristics identified in Step 2, we can fill in the blanks in the question:
- The ortho form of hydrogen has **parallel** spins.
- The para form of hydrogen has **opposite** spins.

### Step 4: Final Answer
Thus, the complete answer to the question is:
The ortho and para forms of hydrogen have **parallel** and **opposite** spins respectively.

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