Which of the following does not belong to the group formed by the others?

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Aluminium

Salt solution

Ceramic articles

Silver

answer is C.

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Detailed Solution

Concept: Examine all of the materials' qualities that are listed in the options. There are materials included in the selections that are effective electrical conductors. Verify which of the options' listed materials are effective at conducting electricity and which are less effective. Consequently, ascertain the right response.
Metals include aluminium. In the valence electrons of the atoms in the valence shell of the metals, there are free electrons. When the metal receives a charge, these electrons can conduct electricity. There are three valence electrons in the outermost shell of the aluminium atom. As a result, aluminium is a good electrical conductor. Because the ions in salt solutions like sodium chloride (NaCl) have the freedom to move about in the solution, these salt solutions conduct an electric current. When sodium chloride dissolves in clean water, sodium (Na+) and chloride (Cl) ions are created. As a result, salt solutions are effective electrical conductors.A lot of atoms must be present in the valence shell of a material's atoms for it to be a good conductor. There are several moveable or free electrons present in the silver atoms. Silver is a good conductor of electricity as a result. Since there are no free electrons in the ceramic atoms' outermost shell to conduct electricity, the atoms in ceramic products are closely bonded together by ionic bonds. Ceramic objects cannot conduct electricity as a result. Therefore, ceramic items don't conduct electricity well. For this reason, ceramic items vary from other items since they are insulators as opposed to conductors.
Hence, the correct answer option (3) .

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