Chemical Reactions - The total number of each type of atom is conserved, and thus the mass does not change.

Explain the types of reaction?

${\mathrm{CO}}_2$ gas is passed through water under pressure. What type of reaction is it with respect to the nature of the reaction? 

Classify the following reaction into combination, displacement, decomposition and double decomposition.

$2{\mathrm{SO}}_2+{\mathrm{O}}_2\to 2{\mathrm{SO}}_3$

Classify the following reaction into combination, displacement, decomposition and double decomposition.

${\mathrm{AgNO}}_3+\mathrm{HCl}\to \mathrm{AgCl}+{\mathrm{HNO}}_3$

Classify the following reaction into combination, displacement, decomposition and double decomposition.
$2{\mathrm{NH}}_3\to {\mathrm{N}}_2+3{\mathrm{H}}_2$

Classify the following reaction into combination, displacement, decomposition and double decomposition.
${\mathrm{ZnCO}}_3\stackrel{∆}{\to }\mathrm{ZnO}+{\mathrm{CO}}_2$

Classify the following reaction into combination, displacement, decomposition and double decomposition.

$2\mathrm{NO}+{\mathrm{O}}_2\to 2{\mathrm{NO}}_2$

When ferrous sulphate undergoes thermal decomposition: 

Complete the following reaction, and then balance.

Barium chloride $+$ Sodium sulphate $\to \_\_\_\_\_ + \_\_\_\_\_$

Complete the following reaction, and then balance.

Lead nitrate $+$ potassium iodide $\to \_\_\_\_\_ + \_\_\_\_\_$

An element $\mathrm{X}$ reacts with a substance and another element is obtained as one of the products. What type of chemical reaction is it with respect to its nature?

Why are halides of silver stored in dark coloured bottles? 

Why are combination reactions generally exothermic?

Why do oils and fats become unfit for consumption if they are exposed to atmosphere for a long time?

Which halogen cannot replace any other halogen from their compounds?

Formation of ${\mathrm{NH}}_4\mathrm{Cl}$ from ${\mathrm{NH}}_3$ and $\mathrm{HCl}$ is a synthesis reaction. Comment on the statement.

What does the symbols $\text{'}\rightleftharpoons \text{'}$ and $\text{'}∆\text{'}$ indicate in a balanced chemical equation?

State the law of conservation of mass with respect to a chemical reaction.

What is the relation between equivalent mass and the atomic mass of an element?