Which of the following is not endothermic ?

1
C + 2S → CS2
2
​​\(\rm H_2+\frac{1}{2}O_2\rightarrow H_2O\)
3
\(\rm N_2+\frac{1}{2}O_2\rightarrow N_2O\)
4
More than one of the above
5
None of the above

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