A Hard and resistant alloy generally used in tip of nib of pen is :
As we learnt in
Magnetic properties -
when a magnetic field is applied to a substance of metals, they show generally two types of magnetic behaviour
KMmO4, in this compund, the O.S. of Mn is +7 and it's d-orbitals are vacant. With no unpaired electrons, the compound is diamagnetic.
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