MHT CET Chemistry question

Chemistry Electrochemistry MHT CET

Consider the following table, Material | conductivity/S m | Material | Conductivity/S m I | | III | sodium | | pure water | Copper | | 0.1 M HCl | 3.91 Silver | | 0.01 M KCl | 0.14 Gold | | 0.01 M NaCl | 0.12 Iron | | 0.1 M HAc | 0.047 Graphite | | 0.01M HAc | 0.016 II | | IV | Glass | | CuO | Teflon | | Si | | | Ge | 2.0

Which is I, II, III, IV in the above table ?

(A)I – Insulator, II – Conductor, III – Aqueous solution, IV – Semiconductor
(B)I – Conductor, II – Insulator, III – Aqueous solution, IV – SemiconductorCorrect
(C)I – Conductor, II – Insulator, III – Semiconductor, IV – Aqueous solution
(D)I – Conductor, II – Semiconductor, III – Aqueous solution, IV – Insulators

Answer: (B)

Solution

Group I (Na, Cu, Ag, Au, Fe, graphite) has conductivities of order 10 to 10 S m, so they are conductors; group II (glass, Teflon) has about 10 to 10 S m, so they are insulators; group III

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Question ID VK-066932