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নিচের কোন উক্তিটি সঠিক ?

MCQ Practice Chemistry

নিচের কোন উক্তিটি সঠিক ?

This question appeared in

BCS 12th Preliminary Question Bank Quiz and Solution General knowledge 1990 part 1Question 11 BCS 12th Preliminary Question Bank Quiz and Solution General knowledge 1990 part 1Question 11 BCS 12th Preliminary Question Bank Quiz and Solution General knowledge 1990 part 1Question 11 BCS 12th Preliminary Question Bank Quiz and Solution General knowledge 1990 part 1Question 11