Consider the following statements regarding diamond : 1. It is an allotrope of silicon. 2. It is a bad conductor of heat and electricity. 3. Tt is the hardest substance. 4. It burns to produce carbon dioxide Which of the statements given above are correct

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Q: 97 (NDA-I/2009)
Consider the following statements regarding diamond :
1. It is an allotrope of silicon.
2. It is a bad conductor of heat and electricity.
3. Tt is the hardest substance.
4. It burns to produce carbon dioxide
Which of the statements given above are correct?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,28,9,5,28,2,2

keywords: 

{'diamond': [0, 0, 3, 3], 'hardest substance': [1, 0, 0, 0], 'silicon': [0, 0, 1, 0], 'carbon dioxide': [2, 0, 5, 6], 'bad conductor': [0, 0, 0, 1], 'electricity': [0, 0, 1, 3], 'heat': [10, 3, 13, 46], 'allotrope': [0, 0, 0, 1]}

Option 1: This statement is incorrect. Diamond is not an allotrope of silicon. It is actually an allotrope of carbon. Silicon has its own allotrope called silicon dioxide.

Option 2: This statement is correct. Diamond is indeed a bad conductor of heat and electricity. This is because its crystal structure does not allow the movement of electrons easily.

Option 3: This statement is correct. Diamond is known to be the hardest substance. It has a unique crystal lattice structure that makes it extremely hard and resistant to scratching.

Option 4: This statement is incorrect. Diamond does not burn to produce carbon dioxide. It is actually a very stable substance and does not react easily with other elements.

Based on the analysis above, the correct answer is option 2: 2, 3, and 4 only.