When two reactants $A$ and $B$ are mixed to give products $C$ and $D$, the reaction quotient $Q$ at

Question

When two reactants $A$ and $B$ are mixed to give products $C$ and $D$, the reaction quotient $Q$ at the initial stage of the reaction is:

Accepted Answer

**Given:** Reaction: $A + B ightarrow C + D$ **Formula:** $$Q = \frac{[C][D]}{[A][B]}$$ **At $t = 0$ (initial stage):** No products have formed yet, so $[C] = 0$ and $[D] = 0$. $$Q = \frac{0 	imes 0}{[A][B]} = 0$$ This confirms option **(A)**. **As the reaction proceeds ($t > 0$):** Concentrations of $C$ and $D$ increase, while concentrations of $A$ and $B$ decrease. Therefore, $Q$ increases with time until $Q = K_c$ at equilibrium. This confirms option **(D)**. **Answer: (A) and (D)**

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