Take a little sodium chloride solution in a test tube. Add a few drops of silver nitrate solution into it. What do you observe?

$\mathrm{NaCl}+{\mathrm{AgNO}}_3\to \mathrm{AgCl}+{\mathrm{NaNO}}_3$

Add some ammonium hydroxide to the white curdy precipitate of silver chloride. What happens to the precipitate?

Analyse the chemical equation given below.

$\mathrm{NaCl}+{\mathrm{AgNO}}_3\to \mathrm{AgCl}+{\mathrm{NaNO}}_3$

Nitrate ion was with silver ion in the second reactant silver nitrate. To which metal ion is this nitrate ion combined now in the product. Are the ions interchanged here?

Arrange the chemical reactions given below in the table under the heads combination reaction, decomposition, displacement reactions and double decomposition.

a) $2\mathrm{KCl}\to 2\mathrm{K}+{\mathrm{Cl}}_2$
b) ${\mathrm{CaCO}}_{3 }\to \mathrm{CaO}+{\mathrm{CO}}_2$
c) $2\mathrm{Hl}\to {\mathrm{H}}_2+{\mathrm{l}}_2$
d) $\mathrm{KCl}+{\mathrm{AgNO}}_3\to \mathrm{AgCl}+{\mathrm{KNO}}_3$
e) $\mathrm{Mg}+2\mathrm{HCl}\to {\mathrm{MgCl}}_2+{\mathrm{H}}_2$
f) $2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}$
g) $\mathrm{Mg}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{MgSO}}_4+{\mathrm{H}}_2$
h) ${\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{BaCl}}_{2 }\to {\mathrm{BaSO}}_4+2\mathrm{NaCl}$

Some chemicals are given in the box. Find out and write down the chemicals needed to prepare oxygen and hydrogen in laboratory.

Sulphuric acid, hydrochloric acid, sodium nitrate, zinc, potassium permanganate, ammonium chloride, water.

Find out to which gases are the following statements related?

The gas which is combustible and is formed through the electrolysis of water

Find out to which gases are the following statements related?

The gas that is used for water purification.

Find out to which gases are the following statements related?

The element inevitable for the growth of plants.

Find out to which gases are the following statements related?

The gas formed by the thermal decomposition of ${\mathrm{KMnO}}_4$.