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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.
Jatin added a crystal of copper sulphate (CuSO4) in a beaker filled with water and left it to settle at the bottom. After sometime he observed that the blue colour appears just above the solid crystal and with the passage of time whole water in beaker turns blue.
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