General Science
Quartz crystals normally used in quartz clocks etc. is chemically

Sodium Silicate
Silicon Dioxide
Germanium Oxide
A mixture of Germanium Oxide and Silicon dioxide

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General Science
Among the various allotrope of carbon

Diamond is the hardest, coke is the softest
Diamond is the hardest, graphite is the softest
Coke is the hardest, graphite is the softest
Diamond is the hardest, lamp black is the softest

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General Science
Amalgams are

Alloys which have great resistance to abrasion
Alloys which contain mercury as one of the contents
Alloys which contain carbon
Highly coloured alloys

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