Aptitude Study | Free Aptitude Tests, Quantitative Aptitude Questions & Practice for Competitive Exams

109. Carbon Allotropes HardnessMedium

Among the various allotropes of carbon

A. Coke is the hardest, graphite is the softest

B. Diamond is the hardest, coke is the softest

C. Diamond is the hardest, graphite is the softest

D. Diamond is the hardest, lamp black is the softest