খর পানিতে বিদ্যমান-
i. CaSO4
ii. MgCl2
iii. NaCl
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