When blue crystals of ferrous sulphate (FeSO₄.7H₂O) are heated, then 7 water molecules are lost & anhydrous ferrous sulphate is formed.
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As we know that -rainbow is caused by “Dispersion of Sunlight” by tiny water droplets present in the atmosphere which is one of the applications of dispersion of light.
Explanation: Sulphur has (atomic number = 16) exist as a gas at room temperature and hence, it is a non-metal.
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