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Which symbol denotes the solid state of a substance in a chemical equation?

Answer and explanation

Correct answer: (s)

Direct answer: A, (s), is correct. Chemical equations often use state symbols in parentheses after a chemical formula to show the physical state of a substance. The letter s stands for solid, so CaCO₃(s) means solid calcium carbonate. This information helps the reader understand whether a substance is a solid, liquid, gas, or dissolved in water during the reaction. Option B, (l), means liquid, as in H₂O(l). Option C, (g), means gas, as in O₂(g) or CO₂(g). Option D, (aq), means aqueous: the substance is dissolved in water, as in NaCl(aq). The state symbol is not a coefficient and does not show the number of particles; it gives the physical condition. A useful memory cue is “s = solid, l = liquid, g = gas.” Be careful not to confuse (aq) with a general liquid: aqueous specifically means dissolved in water, whereas (l) means the substance itself is in the liquid state.

Related tags

Chemical EquationsState SymbolsSolid StateChemical ReactionsClass 10 SciencePhysical StateChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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