Q. What is the meaning of this line?
A balanced equation must be molecular.

Dear Student,

A chemical equation for reaction which involves only complete formulas of substances existed as molecules is known as molecular equation.Also a chemical equation in which all reactants and products are represented as neutral substances
An explmple like, 
                                         Zn + S  ‚Äč ZnS

Hope this helps!

Regards,

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a balanced line should be molecular means the elements in both the sides of the equation,that is ,the reactants and product should be equal

love you,
pallavi :) :) :)
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