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P-1 Chemical reactions and equations — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Chemical reactions and equations2 Marks
Question
Giving an example list two information which make a chemical equation more useful. (informative).
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Answer

$(i)$ Physical state of reactants must be mentioned,
e.g. $2H_{2(g)} + O_{2(g)} \rightarrow 2H_2O_{(1)}.$
$(ii)$ Condition in which reaction take place are written on the arrow head,
e.g. $2 H _{2(g)}+ O _{2(g)} \xrightarrow{\text { burning }} 2 H _2 O _{(1)}$.

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