One of the following substances is neither a good conductor of electricity nor an insulator. This substance is (a) chromium
(b) germanium
(c) gallium
(d) potassium
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(b) germanium
Explanation:
- We are asked to find out which substance is neither a good conductor of electricity nor an insulator.
- We have a lot of elements in the periodic table with different properties some of them with good conductivity and some with insulating properties.
- Now we have substances like metalloids which are specific in the periodic table.
- These compounds exhibit both the properties to an extent.
- Out of all the metalloids some exhibit both the properties and some do not exhibit either of the properties to that extent.
- Chromium and potassium are either insulating or conducting and not both at the same time.
- Whereas gallium and germanium are both metalloids ,in which gallium exhibits both the properties pretty well both germanium doesnt .
- Hence the out of the given substances germanium is neither a good conductor nor an insulator.
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Answer is Option (B)
Explanation:
- Off the given substances, chromium, germanium, gallium & potassium.
- Germanium is not a metal, it comes under the category of metalloids.
- It is neither a good conductor of electricity nor an insulator.
- It is a semiconductor.
- Semiconductors are material that have a conductivity (Electric) value which falls between that of a conductor (eg. metallic copper) and an insulator (eg. glass)
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