State relevant observation: Action of Sodium hydroxide solution on Ferrous sulphate solution.

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Solution

The reaction of Sodium hydroxide $(NaOH)$ with Ferrous sulphate $({FeSO}_{4})$ .
On adding Sodium hydroxide $(NaOH)$ to Ferrous sulphate $({FeSO}_{4})$ solution, a dirty green precipitate is formed.
After some time the green ppt. turns into reddish brown ppt. which is insoluble in excess of Sodium hydroxide $(NaOH)$ .
${FeSO}_{4} (aq) + 2 NaOH (aq) \to Fe {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq) Ferrous Sulphate + Sodium hydroxide \to Ferrous hydroxide + Sodium sulphate$

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"An aqueous solution of ferrous sulphate reacts with ans aqueous solution of sodium hydroxide to form aPrecipitate of ferrous hydroxide and sodium sulphate remains in solution."

Q. (a) Explain, with example, how the physical states of the reactants and products can be shown in a chemical equation.
(b) Balance the following equation and add state symbols:

Zn + HCl \underset{}{\to} {ZnCl}_{2} + H_{2}

(c) Convey the following information in the form of a balanced chemical equation:
"An aqueous solution of ferrous sulphate reacts with an aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in solution."

Q. State one relevant observation for each of the following reactions:
Action of Sodium hydroxide solution on ferrous sulphate solution.

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State your observation with chemical equation :

Aqueous solution of ferrous sulphate is treated with sodium hydroxide

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