Which one of the following is not true for diamond?

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Q: 30 (CDS-II/2015)

Which one of the following is not true for diamond?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,21,18,10,3,5,21

keywords: 

{'diamond': [0, 0, 3, 3], 'other carbon atoms': [0, 0, 0, 2], 'carbon atom': [0, 0, 0, 4], 'carbon atoms': [0, 0, 1, 5], 'dimensional network structure': [0, 0, 0, 1], 'lubricant': [0, 0, 1, 2], 'hard tools': [0, 0, 0, 1], 'abrasive': [0, 0, 0, 1]}

Option 1: This statement is true. Diamond is made up of carbon atoms, and each carbon atom is indeed linked to four other carbon atoms. This arrangement creates a strong and rigid structure.

Option 2: This statement is true. Diamond has a three-dimensional network structure of carbon atoms. This arrangement gives diamond its hardness and unique properties.

Option 3: This statement is true. Diamond is commonly used as an abrasive material for sharpening and cutting hard tools. Its hardness makes it effective for these purposes.

Option 4: This statement is not true. Diamond cannot be used as a lubricant. In fact, diamond has a low coefficient of friction, which means it has high resistance to sliding. This property makes it unsuitable as a lubricant.

In conclusion, option 4 is the correct answer as it is the only statement that is not true for diamond. Diamond cannot be used as a lubricant.