Which term best describes a scenario where two chemicals do not work well together in a tank?

The most appropriate term for a scenario where two chemicals do not work well together in a tank is chemical incompatibility. This term specifically refers to situations in which two substances, when mixed, can lead to undesirable reactions or consequences, such as the formation of hazardous compounds, precipitation, or a decrease in the effectiveness of one or both substances.

Incompatible chemicals may react negatively with each other, leading to safety hazards or reduced efficacy when combined, which is essential for handlers to understand in order to ensure safe and effective use of chemicals. Knowing that certain chemicals are incompatible helps handlers take the necessary precautions during storage and use, thus preventing accidents or dangerous reactions.

Chemical synergy refers to a scenario where two substances work together positively to enhance their effects, which is contrary to the situation described in the question. Chemical volatility involves the tendency of a substance to vaporize, which does not directly imply an interaction that results in incompatibility. Chemical neutralization describes the reaction between an acid and a base to form a neutral solution, which also does not accurately capture the concept of two incompatible chemicals.