তাম্র মলে থাকে-
i. CuCO3
ii. CuSO4
iii. Cu(OH)2
নিচের কোনটি সঠিক?

Created: 9 months ago | Updated: 3 months ago

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Created: 9 months ago | Updated: 3 months ago
Created: 9 months ago | Updated: 3 months ago