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the answer to your question is B

Oxygen molecules spread out as altitude increases

Explanation:

The higher up you get on a mountain the less pressure there is to hold the oxygen molecules together. So they spread out, making the air thinner and harder to breath.

Hope this helps! :)

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