Misc: What U S states were named for the Sioux word "friend"or"ally?

Questions

On which day are the most collect calls made?

On which mode of transportation would you find a plimsoll line?

On which planet, other than earth, did a man made object first land?

On which popular game board would you find 225 squares?

On which scale are there 180 degrees between freezing point & boiling point?