Which one of the following contains a different chemical element as main constituent इनमें से किस एक में औरों से अलग रासायनिक तत्त्व मुख्य घटक है - *
coal कोयला
graphite ग्रेफाइट
hematite हीमेटाइट
diamond हीरा
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Answer:
diamond..I think it should be your answer
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