# Chemical Process Calculation Questions and Answers – Limiting and Excess Reactant-II

This set of Chemical Process Calculation Questions for entrance exams focuses on “Limiting and Excess Reactant-II”.

1. All reactants other than limiting reactant are
a) Excess reactant
b) Other reactants
c) Extent reactant
d) None of the mentioned

Explanation: All reactants other than limiting reactant are called excess reactant.

2. ___________ reactant in a chemical reaction is that would theoretically run out first if the reaction were to proceed to completion according to the chemical equation , even if the reaction did not take place.
a) Excess
b) Limiting
c) Both excess and limiting
d) None of the mentioned

Explanation: Limiting reactant in a chemical reaction is that would theoretically run out first if the reaction were to proceed to completion according to the chemical equation , even if the reaction did not take place.

3. The reactant with the smallest maximum extent of reaction is the ___________ reactant.
a) Excess
b) Limiting
c) Neither excess nor limiting
d) None of the mentioned

Explanation: The reactant with the smallest maximum extent of reaction is the limiting reactant.

4-5. CH4 is burned in the availability of oxygen. If there is 5 moles of each of the feed component is present, then
4. Which one is the limiting reactant?
a) CH4
b) O2
c) Both CH4 and O2
d) Neither CH4 nor O2

Explanation: The required moles of O2 is lesser with respect to CH4.

5. Which one is the excess reactant?
a) CH4
b) O2
c) Both CH4 and O2
d) Neither CH4 nor O2

Explanation: The required moles of CH4 is greater with respect to O2.

6-8. For the given reaction, 2 Al + 3 CuCl2 → 2 AlCl3 + 3 Cu
6. How many moles of Al will react with 2.46 mole CuCl2 according to the reaction?
a) 1.64 moles
b) 3.28 mole
c) 3.69 mole
d) 2.46 mole

Explanation: 2 moles of Al = 3 moles of CuCl2.

7. If The feed contains 3 moles of each component of the feed, which one is the limiting reactant?
a) Al
b) CuCl2
c) Neither Al nor CuCl2
d) None of the mentioned

Explanation: CuCl2 have less number of moles w.r.t. Al.

8. If the feed contains 5 moles of each component of the feed, which one is the excess reactant?
a) Al
b) CuCl2
c) Neither Al nor CuCl2
d) None of the mentioned

Explanation: CuCl2 have less number of moles w.r.t. Al.

9-10. If for the given reaction
N2 + 3 H2 → 2NH3, The feed contains x moles of N2 and y moles of H2.
9. If N2 is the limiting reactant then
a) x = y
b) 3x < y
c) x > y
d) 3x > y

Explanation: If 3x < y, N2 would consume first.

10. If N2 is the excess reactant then
a) x = y
b) 3x > y
c) x < y
d) 3x < y

Explanation: If 3x > y, N2 would consume last.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation for entrance exams, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]