Ceres-about 1200 km in diameter
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No. Ceres, which used to be considered an asteroid, was recategorized as a "dwarf planet" in 2006, about the same time that Pluto was. Ceres is a small rocky body, the biggest in the asteroid belt.
Mercury is not a part of the asteroid belt. The asteroid belt is located between the orbits of Mars and Jupiter. Mercury is far closer to the sun.
No. An asteroid can be anything from 10 metres to 487km as in the case of Ceres the largest asteroid.
no it was not an asteroid that hit the earth, it was kevins big mouth
1991 BA is the closest and smallest asteroid yet observed outside the Earth's atmosphere. Reference.