Chemistry
Related Questions
The formula of a compound represents
- an atom
- a particle
- a molecule
- a combination
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
- Sulphur
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