Question

The INCORRECT statement is

• A. Nickel is ferromagnetic and Aluminium is paramagnetic
• B. Cobalt is ferromagnetic and calcium is paramagnetic
• C. Nickel is ferromagnetic and cobalt is paramagnetic
• D. Both iron and cobalt are ferromagnetic

Hint:

Always remember "Fe-Co-Ni" (Iron, Cobalt, Nickel) as the three standard ferromagnetic elements. Any option labeling one of these as paramagnetic or diamagnetic is false.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Magnetic materials are classified as Diamagnetic, Paramagnetic, and Ferromagnetic based on their behavior in a magnetic field. Common ferromagnets are Iron (Fe), Cobalt (Co), and Nickel (Ni).

Step 2: Detailed Explanation:
Evaluating each option:
(A) Nickel is a ferromagnet, and Aluminium is a paramagnet. (Correct statement)
(B) Cobalt is a ferromagnet, and Calcium is a paramagnet. (Correct statement)
(C) Nickel is ferromagnetic, but Cobalt is also ferromagnetic. The statement claims it is paramagnetic, which is wrong. (Incorrect statement)
(D) Iron and Cobalt are two of the three main elements that are ferromagnetic at room temperature. (Correct statement)
(E) Copper and Lead are both diamagnetic materials. (Correct statement)

Step 3: Final Answer:
Statement (C) is the incorrect one.