A rubber balloon permeable to hydrogen in all its isotopic forms is filled with deuterium `(D_(2))` and then placed in a box containing pure hydrogen. Will the balloon expnad or contract or remains as it is ?

Explanation

To solve the problem regarding the behavior of a rubber balloon filled with deuterium `(D2)` when placed in a box containing pure hydrogen `(H2)`, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Situation**:
- We have a rubber balloon that is permeable to hydrogen in all its isotopic forms. Inside the balloon, we have deuterium gas `(D2)`, and outside the balloon, there is pure hydrogen gas `(H2)`.

2. **Applying Graham's Law of Effusion**:
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