200 cm³ of hydrogen and 150 cm³ of oxygen are mixed and ignited, as per the following reaction,

2H₂ + O₂ ⟶ 2H₂O

What volume of oxygen remains unreacted?

24 cc Marsh gas (CH₄) was mixed with 106 cc oxygen and then exploded. On cooling, the volume of the mixture became 82 cc, of which, 58 cc was unchanged oxygen. Which law does this experiment support? Explain with calculations.

What volume of oxygen would be required to burn completely 400 ml of acetylene [C₂H₂]? Also calculate the volume of carbon dioxide formed.

2C₂H₂ + 5O₂ ⟶ 4CO₂ + 2H₂O (l)

112 cm³ of H₂S (g) is mixed with 120 cm³ of Cl₂ (g) at STP to produce HCl (g) and sulphur (s). Write a balanced equation for this reaction and calculate

(i) the volume of gaseous product formed

(ii) composition of the resulting mixture