Chemistry Questions. Can you answer them?

Question

1) Which of the following is amphoteric? diethyl ether, sodium phosphate, barium hydroxide, aluminum hydroxide, chloric acid

2) A reaction is observed to produce a colorless, odorless gas. Which of the following tests would indicate the precence of carbon dioxide? a glowing splint would make a 'pop' sound with the gas, bubbling the gas through water would make it basic, a glowing splint would reignite in the gas, the gas would react with dilute ammonia solution to create a precipitate, a glowing splint would extinguish in the gas

3) what would be the volume of gas produced at STP from the reaction of .3 mole magnesium and 2 moles hydrochloric acid?

Answer 1

1) aluminum hydroxide

2) glowing splint would extinguish in the gas

3) .3*22.4 = 6.72 litre.