MCQs

11262 questions found

Practice Questions

The concept of yield is most important in the field of:

A. Theoretical chemistry

B. Chemical manufacturing and synthesis ✓

C. Physical chemistry

D. Analytical chemistry

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Jun 23, 2026

A student calculates a theoretical yield of 10g but measures an actual yield of 11g. This result is:

A. Impossible

B. Possible and indicates a highly efficient reaction

C. Possible, but suggests the product is wet or contaminated with impurities ✓

D. A common result for this type of reaction

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Jun 23, 2026

If the percent yield is 75%, it means the reaction produced:

A. 75% of the limiting reactant

B. 75% of the excess reactant

C. 75% of the maximum possible amount of product ✓

D. 25% of the theoretical yield

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Jun 23, 2026

The amount of product predicted by stoichiometry is the:

A. Actual yield

B. Percent yield

C. Experimental yield

D. Theoretical yield ✓

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Jun 23, 2026

Improving laboratory techniques, such as ensuring complete transfer of materials, is done to increase the:

A. Theoretical yield

B. Actual yield ✓

C. Rate of reaction

D. Activation energy

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The difference between the theoretical yield and the actual yield is related to the ______ of the reaction.

A. speed

B. reactants

C. products

D. inefficiency or loss ✓

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Jun 23, 2026

If a chemist aims to produce 50 g of a substance (theoretical yield) but only obtains 40 g, the 40 g represents the:

A. Percent yield

B. Actual yield ✓

C. Limiting reactant mass

D. Stoichiometric yield

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The actual yield must be determined by:

A. Calculation using mole ratios

B. Estimation

C. Experimentation ✓

D. Guessing

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Jun 23, 2026

To calculate the theoretical yield, the first essential step is to have a:

A. High percent yield

B. Known actual yield

C. Balanced chemical equation ✓

D. High temperature

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

Which of the following factors does NOT typically lead to a lower actual yield?

A. The reaction is reversible and does not go to completion

B. Some product is lost during filtration or transfer

C. The reactants were measured perfectly and were 100% pure ✓

D. Unwanted side reactions occur

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Jun 23, 2026

In a chemical reaction, the relationship between the amounts of reactants and the maximum amount of product is called:

A. Stoichiometry ✓

B. Thermochemistry

C. Kinetics

D. Equilibrium

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The theoretical yield is a calculated value based on the:

A. Actual amount of product formed

B. Stoichiometry of the balanced chemical equation ✓

C. Rate of the reaction

D. Percent yield of similar reactions

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Jun 23, 2026

A percent yield greater than 100% most likely indicates:

A. The reaction was extremely efficient

B. The law of conservation of mass was violated

C. The product is impure (e.g., contains unreacted materials or water) ✓

D. The reaction created new matter

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Jun 23, 2026

The formula for calculating percent yield is:

A. (Theoretical / Actual) × 100%

B. (Actual / Theoretical) × 100% ✓

C. (Actual - Theoretical) × 100%

D. (Moles / Mass) × 100%

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Jun 23, 2026

The reactant that determines the theoretical yield of a product is the:

A. Excess reactant

B. Catalyst

C. Limiting reactant ✓

D. Solvent

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

If the actual yield of a product is equal to its theoretical yield, the percent yield is:

A. 0%

B. 50%

C. 100% ✓

D. > 100%

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The actual yield of a reaction is almost always less than the theoretical yield primarily due to:

A. The law of conservation of mass

B. Incomplete reactions, side reactions, and loss of product during recovery ✓

C. The use of a catalyst

D. The high temperature of the reaction

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Jun 23, 2026

Percent yield is a measure of the ______ of a chemical reaction.

A. rate

B. efficiency ✓

C. temperature change

D. activation energy

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nmdcat.online Chemistry NMDCAT MCQs

Jun 23, 2026

The actual yield is the amount of product that is:

A. Calculated from the balanced equation

B. Measured experimentally in the laboratory ✓

C. Always equal to the theoretical yield

D. The amount of product that should have formed

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Jun 23, 2026

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MCQs

Practice Questions

The concept of yield is most important in the field of:

A student calculates a theoretical yield of 10g but measures an actual yield of 11g. This result is:

If the percent yield is 75%, it means the reaction produced:

The amount of product predicted by stoichiometry is the:

Improving laboratory techniques, such as ensuring complete transfer of materials, is done to increase the:

The difference between the theoretical yield and the actual yield is related to the ______ of the reaction.

If a chemist aims to produce 50 g of a substance (theoretical yield) but only obtains 40 g, the 40 g represents the:

The actual yield must be determined by:

To calculate the theoretical yield, the first essential step is to have a:

Which of the following factors does NOT typically lead to a lower actual yield?

In a chemical reaction, the relationship between the amounts of reactants and the maximum amount of product is called:

The theoretical yield is a calculated value based on the:

A percent yield greater than 100% most likely indicates:

The formula for calculating percent yield is:

The reactant that determines the theoretical yield of a product is the:

If the actual yield of a product is equal to its theoretical yield, the percent yield is:

The actual yield of a reaction is almost always less than the theoretical yield primarily due to:

Percent yield is a measure of the ______ of a chemical reaction.

The actual yield is the amount of product that is:

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