Write complete balanced equations for the following reactions :

(a) Calcium (solid) + Water (liquid) $⟶$ Calcium hydroxide (solution) + Hydrogen (gas)

(b) Sulpher dioxide (gas) + Oxygen (gas) $⟶$ Sulphur trioxide (gas)

Q.

Write a balanced chemical equation for each of the following :

1. Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.

2. Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.

3. Methyl alcohol burns in air to form carbon dioxide and water.

4. Liquid hydrogen peroxide decomposes to give water and oxygen gas.

5. Aluminium hydroxide reacts with sulphuric acid to give ammonium sulphate and water.

6. Aluminium sulphate solution reacts with sodium hydroxide to form a precipitate of aluminium hydroxide.

Q. Write the balanced chemical equations for the following reactions:
(a) $\mathrm{Calcium}hydroxide+\mathrm{Carbon}dioxide\underset{}{\to }\mathrm{Calcium}\mathrm{carbonate}+\mathrm{Water}$
(b) $\mathrm{Aluminium}+\mathrm{Copper}\mathrm{chloride}\underset{}{\to }\mathrm{Aluminium}\mathrm{chloride}+\mathrm{Copper}$

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. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide $+$ Oxygen gas $\to$ Zinc oxide solid $+$ Sulphur dioxide gas
ii) Silver nitrate solution $+$ Sodium chloride solution $\to$ Silver chloride precipitate $+$ Sodium nitrate solution
iii) Sulphur solid $+$ Concentrated nitric acid $\to$ Sulphuric acid $+$ Nitrogen dioxide gas $+$ Water
iv) Barium chloride Solution $+$ Potassium sulphate Solution $\to$ Barium sulphate Precipitate $+$ Potassium chloride solution
v) Silver nitrate on heating$\to$ silver metal $+$ nitrogen dioxide gas $+$ Oxygen gas.
vi) Aluminium hydroxide $+$ Nitric acid $\to$ Aluminium nitrate $+$ Water.

Q. (a) Substitute formulae for names and balance the following equation:
Calcium carbonate reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide gas.
(b) Write balanced chemical equation with state symbols for the following reaction:
Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.