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দ্বিবিয়োজন বিক্রিয়াটি হচ্ছে -

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

A g N O_{3} + N a C l \to N a N O_{3} + A g C l

N a_{2} C O_{3} + 2 H_{2} O \to 2 N a O H + H_{2} C O_{3}

Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}

ANS : 2

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