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Question

নিচের কোনটি প্রাথমিক প্রমাণ দ্রব ও জারক পদার্থ?

$N a_{2} C O_{3}$

$K_{2} C r_{2} O_{7}$

$K M n O_{4}$

$N a_{2} C_{2} O_{4}$

ANS : 2

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