Question : Which of the following is an element?
A. Diamond
B. Emerald
C. Sapphire
D. Ruby
Question Listed : Diamond, Elements, Metals,
Question : The hardest substance available on earth is
A. Platinum
B. Diamond
C. Iron
D. Gold
Question Listed : Diamond, Elements, Metals,
Question : Among the various allotropes of carbon
A. diamond is the hardest, lamp black is the softest
B. diamond is the hardest, graphite is the softest
C. diamond is the hardest, coke is the softest
D. coke is the hardest, graphite is the softest
Question Listed : Diamond, Graphite, Elements, Metals,
Question : The hardest form of carbon is
A. charcoal
B. diamond
C. graphite
D. coke
Question Listed : Diamond, Chemistry,