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If the formula for magnesium fluoride is MgF2 and the formula for potassium chlorate is KClO3 , then what is the formula for magnesium chlorate?

When the solution of copper was heated in the flame, a bluish green color was observed . how you might show experimentally the green color results from a mixture of light of various wavelengths or if only 1 wavelength of light is being emitted?

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