General Science
Water is a good solvent of ionic salts because

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

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

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

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