Part A And Part B questions : Part A. Which substance is a non-electrolyte?

A. aqueous ethanol

B. sodium sulfate

C. hydrochloric acid

D. calcium carbonate

Part B: Tin does not react with iron(II) oxide, but it does reduce lead(II) oxide to lead. What is the correct arrangement of the metals in order of decreasing reactivity?

A. tin, lead, iron

B. iron, tin, lead

C. tin, iron, lead

D. iron, tin, lead