Which of the following reactions will involve largest change in the entropy function?

# Which of the following reactions will involve largest change in the entropy function?

1. A

$\mathrm{C}\left(\mathrm{g}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)⟶{\mathrm{CO}}_{2}\left(\mathrm{g}\right)$

2. B

${\mathrm{CO}}_{2}\left(\mathrm{g}\right)⟶\mathrm{CO}\left(\mathrm{g}\right)+\frac{1}{2}{\mathrm{O}}_{2}\left(\mathrm{g}\right)$

3. C

$2{\mathrm{NH}}_{3}\left(\mathrm{g}\right)⟶{\mathrm{N}}_{2}\left(\mathrm{g}\right)+3{\mathrm{H}}_{2}\left(\mathrm{g}\right)$

4. D

$2{\mathrm{SO}}_{3}\left(\mathrm{g}\right)⟶2{\mathrm{SO}}_{2}\left(\mathrm{g}\right)+{\mathrm{O}}_{2}\left(\mathrm{g}\right)$

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### Solution:

Larger the change in gaseous molecules, larger the entropy change.

Thus, the correct option is $2{\mathrm{NH}}_{3}\left(\mathrm{g}\right)⟶{\mathrm{N}}_{2}\left(\mathrm{g}\right)+3{\mathrm{H}}_{2}\left(\mathrm{g}\right)$

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