Chemistry
The formula of a compound represents
- an atom
- a particle
- a molecule
- a combination
Chemical Formula
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Answer
a molecule
Reason — The formula of a compound employs symbols to denote the molecule of a compound.
An atom is the smallest unit of an element that retains its chemical properties (like H, O, Na). A formula of a compound does not represent a single atom, because compounds are made of two or more different atoms chemically combined. A particle is a very broad term. It includes atom, molecule, ion.<>
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Related Questions
The correct formula of aluminium oxide is
- AlO3
- AlO2
- Al2O3
- Al3O2
The valency of lead in lead oxide (PbO) is
- one
- two
- three
- four
Which of the following elements has a molecular mass that is four times its atomic mass?
- Oxygen
- Neon
- Phosphorus
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Match the following : (Refer common names in the beginning of the book)
Compound Formula (a) Boric acid (i) NaOH (b) Phosphoric acid (ii) SiO2 (c) Nitrous acid (iii) Na2CO3 (d) Nitric acid (iv) KOH (e) Sulphurous acid (v) CaCO3 (f) Sulphuric acid (vi) NaHCO3 (g) Hydrochloric acid (vii) H2S (h) Silica (sand) (viii) H2O (i) Caustic soda
(sodium hydroxide)(ix) PH3 (j) Caustic potash
(potassium hydroxide)(x) CH4 (k) Washing soda
(sodium carbonate)(xi) NH3 (l) Baking soda
(sodium bicarbonate)(xii) HCl (m) Lime stone
(calcium carbonate)(xiii) H2SO3 (n) Water (xiv) HNO3 (o) Hydrogen sulphide (xv) HNO2 (p) Ammonia (xvi) H3BO3 (q) Phosphine (xvii) H3PO4 (r) Methane (xviii) H2SO4