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The addition of K2CO3 (aq) to the following solution is expected to produce a precipitate in every case but that one which does not produce precipitate is : 

(A) BaCl2 (aq) 

(B) CaBr2 (aq) 

(C) Na2SO4 (aq) 

(D) Pb(NO3)2 (aq)

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(C) Na2SO4 (aq)

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