Which of the following statements about protons are true?

select all that apply

1 protons have the same magnitude of charge as electrons but are opposite in sign.
2most atoms have more protons than electrons.
3 protons have twice the mass of neutrons.
4protons have a charge of 1+.

the correct answer to this question is 2

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