请解答下面的单项选择题，并简要分析 A、B、C、D 四个选项。
题目：某同学研究浓度对化学平衡的影响，下列说法正确的是
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| 已知： {Cr_{2}O_{7}^{2-}(aq) +H_{2}O(l)} {⇌ } {2CrO_{4}^{2-}(aq)+2H^{+}(aq)^{\;\;\;\;}ΔH= +13.8 kJ/mol} 橙色 黄色 |
| 步骤： 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|
A. 该反应是一个氧化还原反应
B. 待试管 {b} 中溶液颜色不变的目的是使 {Cr_{2}O_{7}^{2-}} 完全反应
C. 该实验不能证明减小生成物浓度，平衡正向移动
D. 试管 {c} 中的现象说明影响平衡的主要因素是温度

A.反应中元素化合价没有变化，不属于氧化还原反应，故A错误；
B.试管 {b} 中溶液颜色不变的目的是使反应到达平衡，且可逆反应中反应物不能完全转化，故B错误；
C.加入氢氧化钠溶液，可能是增大氢氧根离子浓度使平衡正向移动，不能证明减小生成物浓度使平衡正向移动，故C正确；
D.增大氢离子浓度、温度升高均使平衡逆向移动，无法说明影响平衡的主要因素是温度，故D错误。
最终答案：C