Potassium nitrate (KNO3) is a chemical used in photography. Code :

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1 and 3. Brass is an alloy of copper and zinc. It is very useful for its hardness and reliability. Hence statement 1 is correct. Magnetite is an ore of Iron, while Bauxite is main source of Aluminium. Hence statement 2 is incorrect. Mercuries solubilis are homeopathic medicine mainly consist of mercury. It is used for the treatment of mouth, eye, throat oilments etc. Hence statement 3 is correct. Silver bromide is used in photography. While Potassium Nitrate KNO3 is used in solid propellants and fertilizers. Therefore statement 4 is also incorrect.

Potassium nitrate (KNO3) is a chemical used in photography. Code :

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