MATTER AND CHEMICAL FORMULAE
Q.1 Write the symbols of the following elements
1) Zinc 6) Phosphorus
2) Manganese 7) Nickel
3) Potassium 8) Calcium
4) Calcium 9) Lead
5) Gold 10) Neon
Q.2 Find the valencies of the element
1) BaCl2
2) FeO
3) Fe2O3
4) CaCO3
5) Na2O
6) Al(OH)3
7) SO2
8) NH3
Q.3 Define the following terms.
1) Valency 4) Molecule
2) Formula
3) Symbol
Q.4 Write the formula of the following compounds
1) Nitric acid 5) Potassium carbonate
2) Ammonia 6) Calcium oxide
3) Sodium hydroxide 7) Carbon monoxide
4) Hydrogen chloride 8) Sulphuric acid
Q.5 Give examples each of the following.
1) Biatomic molecules
2) Monoatomic molecules 4) Triatomic molecules
3 ) Noble gas
Q.6 Write the valency/valencies of the following
1) Hydrogen 5) Iron
2) Carbon 6) Copper
3) Nitrogen 7) Sulphur
4) Phosphorus 8) Lead
Q.8 Match the following.
A B
1) Potassium a) Aurum
2) Iron b) Stannum
3) Silver c) Ferrum
4) Gold d) Argentum
5) Tin e) Kalium
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