I would say the most correct answer is Kilo, as in kilometers. The store would certainly not be milli, or millimeters away from you, would it now? :)
Hope this helps!
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The answers are true, true, false, true, and false.
MgSO4 + 2NaOH —> Mg(OH)2 + Na2SO4
A large quantity if hydronium ions indicates an Arrhenius acid.