The pair whose both species are used in acid medicinal preparation is:

1.	The pair whose both species are used in acid medicinal preparation is:
Answer» `NaHCO _(3) andMg (OH)_(2)` `Na_(2) CO_(3) andCa(HCO_(3))_(2)` `Ca(HCO_(3))_(2) andMg(OH)_(2)` `Ca(OH)_(2) andNaHCO_(3)` ANSWER :A

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