Consider the following statements: I. A solution of iodine in ethanol known as 'tincture of iodine' is a heterogeneous mixture. II. A suspension is a heterogeneous mixture and its particles scatter a beam of light passing through it, making its path visible. III. A colloidal solution, although it appears homogeneous, is a heterogeneous mixture. Which of the statements given above are correct?
II and III only
Statement I is incorrect: tincture of iodine is iodine dissolved in ethanol, which forms a true solution, and a true solution is a homogeneous mixture, not a heterogeneous one. Statement II is correct: a suspension is a heterogeneous mixture whose comparatively large, visible particles scatter a beam of light passing through it, making the light's path visible, and these particles also settle down on standing. Statement III is correct: a colloidal solution looks uniform to the naked eye, but it is actually a heterogeneous mixture of a dispersed phase in a dispersion medium, and it too shows scattering of light (the Tyndall effect). Hence, only statements II and III are correct.
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