Q17 / 160 · TS EAMCET 2020 (11 Sep Shift 1) · Chemistry

When graphite is heated at $300^{\circ} \mathrm{C}$ with potassium vapour, it forms $\mathrm{C}_8 \mathrm{~K}$ compound that shows one of the following property.

  • A
    Conducting and diamagnetic
  • B
    Non-conducting and diamagnetic
  • Correct answer
    C
    Conducting and paramagnetic
  • D
    Non-conducting and paramagnetic

Solution

$\begin{aligned} & \text { Graphite } \underset{\mathrm{K} \text { (Vapours) }}{\stackrel{\Delta}{\longrightarrow}} \underset{\text { Graphite intercadation compound }}{\mathrm{C}_8 \mathrm{~K}} \\ & \end{aligned}$ These are super conductors. Super conductivity in these compound is though to be related to the role of on inter layer state, a free electron like bond lying roughly $2 \mathrm{eV}$ above the fermi level. Due to presence of free electrons or unpaired electrons, it shows paramagnetism.

Hence, the correct answer is option: 'C'.

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