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From your observation ientify by clicking when the bulb lights and when it does not.
Substance
Solid
Molten
a)Lead(ii)Bromide
lights
does not light
lights
does not light
b)Sugar
lights
does not light
lights
does not light
c)Sulphur
lights
does not light
lights
does not light
d)Lead(ii)Iodide
lights
does not light
lights
does not light