Silicon is the main constituent of _______.
The main constituent of cell wall in a plant is ______.
Fill in the blanks.
(a) The main constituent of an acid is …………
(b) The main constituent of a base is …………
(c) Tartaric acid is a ………… acid.
(d) To get acidic salts ………… acids are used.
The main constituent of petroleum gas is : (a) methane (b) ethane (c) butane (d) propane