Which of the following compounds is the most reduced?

ethene

carbon dioxide

propanone

ethane

The correct answer is ethane.

Explanation:

Most reduced species is defined as the species which contains the maximum number of hydrogen atoms and cannot be further reduced.

Oxidized species are the species which can be further reduced.

From the given options:

1.) Ethene: This specie has 4 hydrogen atoms and can be further reduced into ethane using where, nickel acts as a catalyst.

2.) Carbon dioxide: This specie does not contain hydrogen at all. Hence, it is not a reduced specie.

3.) Propanone: This specie contains 6 hydrogen atom and can be further reduced into propanol using .

4.) Ethane: This specie contains 6 hydrogen atoms and cannot be further reduced.

From above information, the most reduced specie is ethane.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

he would use the colour black