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Answer: 1. When water is added to calcium oxide, it will be converted into calcium hydroxide
with liberation of enormous amount of heat.
2.the surface area of iron wire scrubbers very high compared to the surface area of iron nail of the same mass.more surface area means more site for the reaction to take place. This increase in area increases the speed of reaction. The factor responsible is surface area .
3. It's ferric oxide.
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