Which reactant stops a reaction when it is completely used up?

B. सीमित अभिकारक / Limiting reactant

Step 1: This is the limiting reagent concept of stoichiometry. Step 2: The limiting reactant is used up first and decides the maximum amount of product. Step 3: Exam tip: the reactant that finishes first is the limiting reactant.

Step 1: यह stoichiometry की limiting reagent concept है। Step 2: Limiting reactant पहले खत्म हो जाता है और product की maximum मात्रा तय करता है। Step 3: परीक्षा टिप: जो reactant पहले खत्म हो, वही limiting reactant है।