कार्बन का सबसे कठोर रूप है – McqOptions

MCQOPTIONS

1.	कार्बन का सबसे कठोर रूप है
A.	कोक
B.	सीसा
C.	हीरा
D.	लकड़ी का कोयला
Answer» B. सीसा

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