Which of the following components of cement sets at the slowest rate?

Which one of the following metal oxides is antiferromagnetic in nature?

Under which category are iodine crystals placed among the following?

$MnO$ exhibits

What are molecular solids? State its types.

Given below are two statements.
Statement $I$ : $O_2, Cu^{2+}$ and $Fe^{3+}$ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field.
Statement $II$ : $NaCl$ and $H_2O$ are weakly magnetized in opposite direction to magnetic field.
In the light of the above statements,choose the most appropriate answer from the options given below: