Asked in PMC Practice Test 9 (2021) 2021

The reactant which is consumed completely in a reaction is known as a _ reactant.

Correct answer: C. Limiting

  • A. Fractional
  • B. Initial
  • C. Limiting
  • D. Minor

Explanation

A limiting reactant is a reactant that is present in the smallest amount in a reaction and therefore limits the amount of product that can be formed. It is called the "limiting" reactant because it determines the extent of the reaction.

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About Limiting and Excess Reactants

Limiting and excess reactants are identified from the balanced chemical equation and the available amounts of each substance. The limiting reactant determines the maximum product formed, while the excess reactant remains after completion, so questions require mole ratios, theoretical yield and sometimes percentage yield calculations.

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