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কোনটি তাপহারী বিক্রিয়া ?

C + O_{2} \to C O_{2}

2 H_{2} + O_{2} \to 2 H_{2} O

C + 2 S \to C S_{2}

N_{2} + 3 H_{2} \to 2 N H_{3}

2 S O_{2} + O_{2} \to 2 S O_{3}

ANS : 3

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