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(¡)purple flames are evolved in the test tube
(¡¡)copper sulphate changes its colour from blue to light green
(¡¡¡)a reddish brown colour gas is released.It is nitrogen dioxide.It has an irritating odour
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1)When iodine crystals are heated in a test tube Vander wall easily overcomes and the molecules Break into gas phase.They sublime and form a purple color dense vapour.
2)When iron nail is added to the copper sulphate solution reaction takes place and the color changes to pale green and the and the color of iron nail will be changed.
3)When lead nitrate crystals are heated strongly nitrate crystals decomposes to lead oxide , oxygen and nitrogen dioxide.
4) When ferric chloride Crystals are exposed to atmosphere it absorbs moisture from the atmosphere and gets converted into it's solution.
5)They turn white because they looses the water molecules when heated and looses blue color.
Explanation:
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