ETEA MDCAT MCQs

(MCQ from ETEA MDCAT 2023)

Q: Oxygen can be prepared by the decomposition of potassium chlorate (KClO₃). How many moles of oxygen (O₂) can be formed by taking 12 moles of potassium chlorate (KClO₃), according to the following equation?

2KClO₃ (s) + heat → 2KCl (s) + 3O₂ (g)

A) 12 moles of oxygen
B) 15 moles of oxygen
C) 18 moles of oxygen
D) 21 moles of oxygen

(MCQ from ETEA MDCAT 2023)
Q: Consider the reaction below. If 5 moles each of hydrogen and oxygen are reacted to form water, the reaction reveals:

2H₂ + O₂ → 2H₂O

A) H₂ is excess reagent
B) O₂ is limiting reagent
C) H₂ is limiting reagent
D) Reaction has no limiting reagent