The question asks to find the antonym (विलोम शब्द) of the underlined word in the given sentence. The sentence is: "पक्षपात करना अच्छी बात नहीं है।" The underlined word is पक्षपात (pakshpaat). Meaning of पक्षपात (pakshpaat): पक्षपात means partiality, bias, favoritism, or prejudice*. It refers to showing unfair preference to one side or person over another. Now let's examine the given options: 1. अलग (alag): This means separate, different, or distinct. This is not the antonym of partiality. 2. निष्पक्षता (nishpakshata): This means impartiality, fairness, or neutrality. This is the direct opposite of partiality. 3. खण्ड (khand): This means piece, part, or section. This is unrelated to partiality. 4. विग्रह (vigrah): This means separation, dispute, or conflict. In grammar, it refers to the breaking down of a compound word. This is not the antonym of partiality. The antonym of "पक्षपात" (partiality) is "निष्पक्षता" (impartiality). The final answer is $\boxed{\text{निष्पक्षता}}$