Question

assertion :when 4moles of H2 reacts with 2 moles of O2 then 4 moles of water is formed reason:O2 will react as limiting agent

Answer 1

ASSERTION IS TRUE BUT REASON IS NOT

Answer 2

The assertion is true, reason is false.

• Formation of H₂O is H₂ + $\frac{1}{2}$O₂ -> H₂O => This means one mole of hydrogen reacts with 1/2 moles of oxygen to form water
• In the assertion it is given as 4H₂ + 2O₂ -> 4 H₂O => This is a balanced equation where both H and O are getting fully used. Therefore, the assertion is true.
• We look at the reason it says that O₂ acts as a limiting reagent:           - Take the equation: 4H₂ + 2O₂ -> 4 H₂O                                                          - If O₂ is a limiting reagent that means it gets used fully but some moles of H₂ is still left out.                                                                               - 2O₂ = 0, ∴ 4 - 2x2H₂ moles of hydrogen are used. 4 - 2x2H₂ = 0. This implies that both H₂ and O₂ are getting fully used. So, there is no limiting reagent present. Therefore, the reason is false.
• Hence we can say that Assertion is true, but the reason is false.

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