What conditions must be met in order for an aqueous solution to be called "neutral"?

the concentrations of hydronium and hydroxide ions are equal.
the hydroxide ion concentration is greater than the hydronium ion concentration.
there are no hydronium or hydroxide ions present in the solution.
the hydronium ion concentration is greater than the hydroxide ion concentration.
none of the above.

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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