Give a balanced chemical equation in which the product forms a dirty green precipitate

Q. Identify and correct the mistakes in the following sentences: While balancing a chemical equation,
a) change the formulae wherever necessary.
b) use the upward arrow mark $(\uparrow )$ if the product formed is a precipitate.

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:
$\mathrm{Zn}+\mathrm{HCl}\underset{}{\to }{\mathrm{ZnCl}}_2+{\mathrm{H}}_2$
(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. (a) What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer.
(b) Write balanced chemical equation from the following information:
An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.

Q. When magnesium ribbon burns in air or oxygen, a product is formed. State the type of chemical reaction and name the product formed in the reaction. Write the balanced chemical equation of this reaction.