What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5? it's a group 5a element. it's a group 6a element. it's a group 3a element. it's a group 7a element.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l