- On what basis can air be classified as a solution,suspension or colloid?

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Could someone explain why 2NO (g) + Br2 (g) === 2NOBr (g) is a redox? (The system is in equilibrium ===) Thank you!? Can anyone solve the following Euler equation: x²y'' + 2xy' - 6y = 0? What is through (-3, 4); vertical in standard form? (2y^7/9)^-3=? What is the difference between agar slant and agar deep?