Thus, MnO exhibits antiferromagnetism, making option (B) the correct answer.
MnO (Manganese(II) oxide) exhibits antiferromagnetism. In antiferromagnetic materials, the magnetic moments of atoms or ions are aligned in opposite directions, canceling each other out and resulting in no macroscopic magnetization at temperatures below the Néel temperature.
How many of the following molecules / ions have a trigonal planar structure?
\( \text{BO}_3^{3-}, \, \text{NH}_3, \, \text{PCl}_3, \, \text{BCl}_3, \, \text{ClF}_3, \, \text{XeO}_3 \)
A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force \( F = 20 \, \text{N} \) acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take \( g = 10 \, \text{m/s}^2 \)):