General Science
Water is a good solvent of ionic salts because

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

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General Science
Among the various allotrope of carbon

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

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General Science
The dark lines in the solar spectrum are due to

Absorption of corresponding wavelengths by the prism used in the photograph.
Destructive interference between waves of certain definite wavelengths.
Absorption of corresponding wavelengths by the outer layers of the sun.
Absence of corresponding wavelengths from the light emitted by the core of the sun.

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