Physics
Pure water is bad conductor of electricity because it is

A non-polar solvent
Feebly ionized
Not volatile
A very good solvent

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not require a medium to propagate.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not show interference and diffraction.

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