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Balancing Chemical Equations by Hit and Trial Method

29. Write bal...

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29. Write balanced chemical equations with the physical states of reactants and products for tarnishing of silver and rusting of iron

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

Q. Carbon monoxide reacts with hydrogen under certain conditions to form methanol (CH₃OH). Write a balanced chemical equation for this reaction indicating the physical states of reactants and product as well as the conditions under which this reaction takes place.

Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate

(a) Write the equation.

(b) Check whether it is balanced, if not balance it.

(c) Find the weights of reactants and products.

(d) State the law that this equation satisfies.

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."

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.

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Balancing Chemical Equations by Hit and Trial Method

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