How to identify the state in particular chemical equation ? For e.g. : aqueous solution

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Q. Question 20.3

Write the balanced chemical equation for the following reaction and identify the type of reaction.

Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.

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."

State your observation with chemical equation :

Aqueous solution of ferrous sulphate is treated with sodium hydroxide

Q. Write chemical equation for the event.
Iron filings are dropped in aqueous solution of copper sulphate.

(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 :

$Z n + H C l ⟶ Z n C l_{2} + H_{2}$

"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."

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