Discussion
The plot of χT versus T (where χ is molar magnetic susceptibility and T is the temperature) for a paramagnetic complex which strictly follows Curie equation is
- A.
- B.
- C.
- D.
Answer: C
The correct plot is the horizontal straight line (C).
The Curie law says the molar susceptibility of an ideal paramagnet is inversely proportional to temperature:
\[ \chi = \frac{C}{T} \quad \Rightarrow \quad \chi T = C \]
The product χT is therefore a constant, independent of T, and a plot of χT against T is a horizontal line. Its height is the Curie constant, which fixes the effective magnetic moment.
A falling curve such as A is what χ itself does against T. A falling or rising straight line (B or D) would mean χT varies with temperature, as it does with antiferromagnetic or ferromagnetic coupling or a Curie-Weiss term, which the question excludes.
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