The exercise increases the rate at which the solution change to color yellow.
BTB [ Bromothymol blue] is an acid indicator that is used to measure the quantity of carbon dioxide that is produced after exercising for a specified period of time. The presence of carbon dioxide turns the blue solution to yellow. The higher the quantity of carbon dioxide present, the higher the rate at which the solution turns to yellow.
It depends on the number of valence electrons required to make octet or duplet( in case of H)
. For example, Nitrogen(atomic number = 7) has electronic configuration(2,5) which means nitrogen has 5 valence electrons and requires 3 more electrons to complete its octet. After gaining 3 electrons from atoms of an element with less electronegativity than N, it forms nitride ion ().
Hope this helps.
They are made up of chains of Hydrogen and c) Carbon