Answer : The correct option is, 2
Explanation :
The given molecule is, [tex]Ni(OH)_2[/tex]. It is made up of 1 mole of nickel ion and 2 mole of hydroxide ion.
In the given molecule of nickel hydroxide :
The number of nickel atoms = 1
The number of oxygen atoms = 2
The number of hydrogen atoms = 2
Hence, the number of oxygen atoms present in one molecule of nickel hydroxide is, 2.