General Science
Soap is a mixture of sodium or potassium salts of

Mono-carboxylic acids
Dicarboxylic acids
Glycerol
Tricarboxylic acids

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

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

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