Which compounds yield hydrogen ions as the only positive ions in an aqueous solution?
(1) h2co3 and hc2h3o2
(2) h2co3 and nahco3
(3) nh3 and hc2h3o2
(4) nh3 and nahco3

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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