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Note the following balanced chemical equation:
2CO + O₂ ⇌ 2CO₂

Which one of the following statements is significant in relation to the above chemical equation?

General Ability 2014 NDA General Ability 2014 NDA 2014

Options

One can add to a vessel only 2 mol of CO for each mol of O₂ added

No matter how much of these two reagents are added to a vessel, 1 mol of O₂ is consumed

When they react, CO reacts with O₂ in a 2 : 1 mol ratio

When 2 mol of CO and 1 mol of O₂ are placed in a vessel, they will react to give 1 mol of CO₂