General Science
Potassium Permanganate is used for purifying drinking water, because

It is a sterilising agent.
It is an oxidising agent.
None of the listed here
It is a reducing agent

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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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