c) Reverse biasing (increases/decreases) the width of the depletion layer.
d) Ion exchange resin can remove (temporary hardness /permanent hardness/both).
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Answer:
c) increases
d) both
Explanation:
c) When p-n junction is reversed biased, the positive terminal of the external battery is connected to n-side of p-n junction and its negative terminal to p-side of p-n junction. ... Due to it, the majority charge carriers move away from the junction. This increases the width of the depletion layer.
d) Both temporary and permanent hardness in water is removed by distillation. Temporary hardness can be removed by boiling and filtration. permanent hydration can be removed by adding washing soda, permutit method and by using ion exchange resins.
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