Study the given diagram and answer the following questions. Carbondioxide preparation and properties.

i) Which gas is collected in gas jar?

ii) Why is the gas jar kept erect?

iii) What happen when gas is reacted with potassium hydroxide? Write the balanced chemical equation.

(i)  Carbondioxide (CO₂) gas is collected in the jar.

(ii) Carbondioxide (CO₂) gas is heavier than air so it can be collected  by upward displacement of air hence the gas jar is kept erect.

(iii)   2KOH + CO₂ → K₂CO₃ + H₂O