MCQ
Highest density is of ……….
- A$Ir$
- ✓$Os$
- C$Pb$
- D$Hg$
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${C_({graphite)}} + {O_2} \to C{O_2};\,\Delta H = - 393.4\,kJ/mole$
${C_({graphite})} \to {C_{{\rm({diamond})}}};\,\Delta H = $
