Which of the following is an endothermic reaction?

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India Flame Institute
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1) N 2 plus 3 H 2 plus 92 KJ giving 2 NH 3
2)N 2 plus O 2 plus 180 .8 K J giving 2 N O
3) H 2 plus Cl 2 giving 2H Cl plus 184.6 Kj
4)C graphite plus 2H 2 giving C H 2 plus 74.8 K j



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