Teaching Jharkhand (JSSC) PRT (1 to 5) Mock Test 2023 General Science Chemistry Periodic Table

खालीलपैकी पृथ्वीवरील सर्वात कठीण पदार्थ कोणता आहे?

1
सोने
2
लोखंड
3
हिरा 
4
प्लॅटिनम
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