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Chemistry Chemistry Difficulty: Medium

Which of the following is a secondary pollutant ?

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The number of ions produced by [Pt(NH3)]Cl2? Compounds having same molecular formula but differ in structural formula are called __________________? Halides in which halogen atoms act as a bridge between two atoms of the other element are called___________________? Percentage of calcium in calcium carbonate is___________________? Which of the following is not a nitrogenous fertiliser?