I think the answer is 7mm but I'm not sure.
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Answer:
A. Warning
Explanation:
Out of all said choices, the best choice would be warning since it would fit the sentence the most.
"A Warning notifies you that danger is present." compared to:
"A Hazard notifies you that danger is present."
"A Safety notifies you that danger is present."
"A Danger notifies you that danger is present."
The answer is "opposite charges."
It is water soluble so is also soluble in aqueous solutions of NaOH or NaHCO3.
