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4.08 g of a mixture of BaO and unknown carbonate (MCO3) was heated strongly. The residue 3.64 g was dissolved in 1000 mL of 1N HCl.

The excess acid required 16 mL of 2.5 N NaOH solution for complete neutralisation.

Which of the following is the metal M?

(A) K

(B) Na

(C) Ca

(D) Cu

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The Metal M is Calcium (Ca).

So, The correct option is (C)

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