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Standard X
Chemistry
Writing Chemical Equations
Physical stat...
Question

Physical states of reactants and products are mentioned while writing a chemical equation.

A
True
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B
False
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Solution

The correct option is A True

Chemical equations should contain information about the state properties of products and reactants to make a chemical equation more informative. The gaseous, liquid, aqueous and solid states of reactants and products are represented by the notations (g), (l), (aq) and (s) respectively.

For example, CaCO₃ (s) → CaO (s) + CO₂ (g)

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

Hence, the given statement is True.


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Q.

Give scientific reasons:

(1) Grills of doors and windows are always painted before they are used.

(2) Physical states of reactants and products are mentioned while writing a chemical equation.

(3) Potassium Ferrocyanide is stored in dark coloured bottles and kept away from sunlight.

(4) Iron articles rust readily whereas steel which is also mainly made of iron will not undergo corrosion.

(5) Edible oil is not allowed to stand for a long time in an iron or tin container.

Q.

An is drawn in between the reactants and products while writing the equation for a chemical reaction.


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