Which one of the following is not a mixture?

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Q: 97 (NDA-II/2009)

Which one of the following is not a mixture?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,42,23,11,42,8,4

keywords: 

{'mixture': [0, 0, 1, 5], 'cement': [0, 0, 1, 4], 'mercury': [0, 0, 2, 2], 'air': [1, 0, 0, 0], 'milk': [0, 0, 1, 2]}

The question asks us to identify which option is NOT a mixture. Let`s analyze each option to determine if it is a mixture or not:

1. Air: Air is a mixture of several gases, including nitrogen, oxygen, carbon dioxide, and others. Therefore, option 1 is a mixture.

2. Mercury: Mercury is an element and not a mixture. It exists naturally as a pure substance. Therefore, option 2 is the correct answer.

3. Milk: Milk is a mixture that consists of water, fats, proteins, lactose, and various other substances. Therefore, option 3 is a mixture.

4. Cement: Cement is a mixture of minerals such as limestone, clay, and gypsum. It is mixed with water to form a solid mass. Therefore, option 4 is a mixture.

In conclusion, the only option that is not a mixture is option 2, which is mercury.