Physics
When a piece of pure silicon is doped with aluminium, then

The resistivity of the doped silicon piece will increase
The doped silicon piece will become n-type
The doped silicon piece will become p-type
The conductivity of the doped silicon piece will remain the same

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water
It produces corrosion

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