General Science
Water is a good solvent of ionic salts because

It has a high dipole moment
It has no colour
It has a high boiling point
It has a high specific heat

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General Science
Among the various allotrope of carbon

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

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