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When two reactants A and B are mixed to ...

When two reactants `A` and `B` are mixed to give products, `C` and `D`, the reaction quotient `(Q)` at the initial stages of the reaction

A

Is independent of time

B

Increases with time

C

Decreases with time

D

Is zero

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The correct Answer is:
To solve the question regarding the reaction quotient (Q) at the initial stages of the reaction between reactants A and B to form products C and D, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Reaction**: The reaction can be represented as: \[ A + B \rightarrow C + D \] 2. **Define the Reaction Quotient (Q)**: The reaction quotient (Q) for this reaction is defined as: \[ Q_c = \frac{[C][D]}{[A][B]} \] where \([C]\), \([D]\), \([A]\), and \([B]\) are the molar concentrations of the respective species at any point in time. 3. **Initial Concentrations**: At the initial stages of the reaction, the concentrations of reactants A and B will be at their maximum, while the concentrations of products C and D will be zero (assuming the reaction has just started). 4. **Calculate Q at Initial Stage**: At the very beginning of the reaction: \[ [C] = 0 \quad \text{and} \quad [D] = 0 \] Thus, the reaction quotient \(Q_c\) becomes: \[ Q_c = \frac{[0][0]}{[A][B]} = 0 \] 5. **Behavior of Q Over Time**: As the reaction proceeds, the concentrations of products C and D will increase while the concentrations of reactants A and B will decrease. Consequently, the value of \(Q_c\) will change: - The concentration of products \([C]\) and \([D]\) will increase. - The concentration of reactants \([A]\) and \([B]\) will decrease. 6. **Conclusion About Q**: Since \(Q_c\) is dependent on the concentrations of products and reactants, and as time progresses, \(Q_c\) will increase. Therefore, we can conclude that: - \(Q_c\) is **not** independent of time. - \(Q_c\) **increases** with time as the reaction proceeds. 7. **Select the Correct Option**: Based on the analysis, the correct option is that \(Q_c\) increases with time. ### Final Answer: The reaction quotient \(Q_c\) increases with time as the reaction progresses. ---
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