Which salt would yield carbon dioxide on treatment with acid?

Question

#"A. Sodium chloride; B. Iron sulfide; C. iron nitrate; D. iron carbonate."#

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Answer 1 · 2017-06-01T14:14:49

#"Option D."#

#FeCO_3# occurs as the mineral #"siderite"#. Under acidic conditions, the carbonate would react to liberate carbon dioxide......

#FeCO_3(s) + 2HX(aq) rarr FeX_2(aq) + H_2O(l) + CO_2(g)uarr#

The iron halide would be water soluble............

Note that nitrates are usually soluble, and mercurous and plumbic halides are pretty insoluble.