Which of the following is a reaction of combination?

# Which of the following is a reaction of combination?

1. A

$3\mathrm{Mg}+{\mathrm{N}}_{2}\to {\mathrm{Mg}}_{3}{\mathrm{N}}_{2}$

2. B

$\mathrm{Ca}\left(\mathrm{s}\right)+{\mathrm{V}}_{2}{\mathrm{O}}_{5}\left(\mathrm{s}\right)\to 2\mathrm{V}\left(\mathrm{s}\right)+5\mathrm{CaO}\left(\mathrm{s}\right)$

3. C

$2{\mathrm{KClO}}_{3}\left(\mathrm{s}\right)\stackrel{∆}{\to }2\mathrm{KCl}\left(\mathrm{s}\right)+3{\mathrm{O}}_{2}\left(\mathrm{g}\right)$

4. D

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### Solution:

$3\mathrm{Mg}+{\mathrm{N}}_{2}\to {\mathrm{Mg}}_{3}{\mathrm{N}}_{2}$ This is combination reaction

$\mathrm{Ca}\left(\mathrm{s}\right)+{\mathrm{V}}_{2}{\mathrm{O}}_{5}\left(\mathrm{s}\right)\to 2\mathrm{V}\left(\mathrm{s}\right)+5\mathrm{CaO}\left(\mathrm{s}\right)$ This is Redox reaction

$2{\mathrm{KClO}}_{3}\left(\mathrm{s}\right)\stackrel{∆}{\to }2\mathrm{KCl}\left(\mathrm{s}\right)+3{\mathrm{O}}_{2}\left(\mathrm{g}\right)$ This is decomposition reaction

This reaction is disproportination reaction

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