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Which of the following is an endothermic...

Which of the following is an endothermic reaction?

A

`C+O_(2) rarr CO_(2)`

B

`N_(2)+O_(2) rarr NO`

C

`3H_(2)+N_(2) rarr 2NH_(3)`

D

`PCl_(3)+Cl_(2) rarr PCl_(5)`

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The correct Answer is:
B
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