Provide an explanation for each of the following phenomena: (a) Solid argon (m.p. –189.2°C; b.p. –185.7°C) can be prepared by immersing a flask containing argon gas in liquid nitrogen (b.p. –195.8°C) until it liquefies and then connecting the flask to a vacuum pump, (b) The melting point of cyclohexane (C6H12) increases with increasing pressure exerted on the solid cyclohexane. (c) Certain high-altitude clouds contain water droplets at –10°C. (d) When a piece of dry ice is added to a beaker of water, fog forms above the water.
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