JEE 2020 : Limiting Reagent

In a closed vessel at STP, 50 L of CH₄ is ignited with 750 L of air (containing 20% O₂). The number of moles of O₂ remaining in the vessel on cooling to room temperature is closest to

SO₂+ 2H₂S → 3S + 2H₂O

2 mol of H₂S and 11.2 L SO₂ at NTP react to form x mol of sulphur; x is

Consider the following equation :

N₂(g) + 3H₂(g) → 2NH₃ (g)

If 2 moles N₂ and 3 moles H₂ reacts, then many moles of NH₃ are formed by them?

20 ml of 0.1 N BaCl₂ is mixed with 30 ml of 0.2 N Al₂(SO₄)₃. The maximum weight in grams of BaSO₄ that would be formed, assuming the reaction to be 60% efficient is, approximately (Atomic mass of Ba= 133.3 u)