CHEMISTRY [2 Mark Question Answer]

K2CO3= There are 2 atoms of potassium, 1 atom of carbon and 3 atoms of oxygen are present.
Pb(NO3)2 = There are 1 atom of lead (Pb), 2 atoms of nitrogen and 6 atoms of oxygen.
CuSO4= There are 1 atom of copper, 1 atom of sulphur and 4 atoms of oxygen.
NaHCO3 = There are 1 atoms of sodium, 1 atom of hydrogen, 1 atom of carbon and 3 atoms of oxygen.
CH4= There are 1 atom of carbon and 4 atoms of hydrogen.

2O= It represents two molecules of Oxygen.
H2= It represents two atoms of hydrogen element.
10 H2O= It represents ten molecules of water.
4 Cl = It represents four molecules of chlorine.
5CO2 = It represents 5 molecules of Carbon dioxide.
FeS = It represents one molecule of iron sulphide.

The names of 6 common metals along with their symbols are :-
Sodium: The symbol for sodium is ‘Na’.
Magnesium: The symbol for magnesium is ‘Mg’.
Iron: The symbol for iron is ‘Fe’.
Copper: The symbol for copper is ‘Cu’.
Silver: The symbol for silver is ‘Ag’.
Gold: The symbol for gold is ‘Au’.