In a chemical reaction, zinc metal reacts with perchloric acid solution to produce zinc perchlorate (in solution) and hydrogen gas, which escapes. The species being oxidized in this reaction is:

elements make up everything, and they combine to make compounds.

the answer is c

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