The Electromagnetic<span> Spectrum consists of radio </span>waves, microwaves (a type of radiowave<span>), infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays. </span>Waves with the longest wavelengths<span> have the lowest frequencies. </span>Waves with the shortest wavelengths<span> have the highest frequencies.
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It is difficult to measure the enthalpy change of hydration accurately in a direct way because the hydration process can't be controlled directly. Instead, anhydrous and hydrated copper(II) sulfate can be dissolved in water. Each 'route' produces a solution of hydrated copper(II) sulfate.
Right answer is option d that o is oxidized.