Q59 · CSIR NET Chemistry, December 2016
Paper: CSIR NET December 2016 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
Consider the following statements for $\mathrm{KC_8}$ : (A) It is paramagnetic (B) It has eclipsed layer structure (C) Its electrical conductivity is greater than that of graphite. The correct answer is
(a)A and B
(b)A and C
(c)B and C
(d)A, B and C
Answer
Answer: D ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
KC₈ has K between every layer, which forces AAAA (eclipsed) stacking; the transferred electrons make it metallic (paramagnetic, Pauli) and a better conductor than graphite. All three statements are correct.
Study loop for Main Group Elements