Teaching UP TGT Mock Test Series 2025 General Science Chemistry Organic Chemistry

खालीलपैकी नैसर्गिकरित्या आढळणारा पृथ्वीवरील सर्वांत कठीण पदार्थ कोणता?

1
ग्रॅफाइट 
2
वर्टझाइट बोरॉन नायट्राईड 
3
लोखंड 
4
हिरा 
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