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নিম্নের কোন বিক্রিয়াটি তাপহারী?

C + O_{2} = C O_{2}

2 H_{2} + O_{2} = H_{2} O

N_{2} + O_{2} = 2 N O

N_{2} + 3 H_{2} = 2 N H_{3}

ANSWER : 3

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