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A gas jar containing air is inverted over another containing NO₂ gas which is brown in colour and heavier than air. After some time brown colour is seen in the inverted gas jar too. Identify the phenomenon associated with this observation.
Assertion (A): The rate of mixing of copper sulphate or potassium permanganate crystals is faster in hot water than in cold water. Reason (R): The increased temperature of water decreases the kinetic energy of the water molecules, leading to faster movement and quicker dissolution of the crystals.
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