In Latin, the meaning of “AQUA – REGIA” is Water which is loyal or in another words Loyal water. Aqua – regia can be prepared by mixture of two chemicals, (used by jewellery) first is concentrated HCl and concentrated HNO₃ ...
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When manganese dioxide reacts with hydrochloric acid, the manganese dioxide (MnO₂) reduces to MnCl₂ while hydrochloric acid (HCI) oxidizes to chlorine gas (Cl₂).
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