A Hard and resistant alloy generally used in tip of nib of pen is :

 

  • Option 1)

    Os, Ir

  • Option 2)

    Pt, Cr

  • Option 3)

    V , Fe

  • Option 4)

    Fe, Cr

 

Answers (1)
P Plabita

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 

1.  Diamagnetism

2.  Paramagnetism

-

 

 

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. 

 

 


Option 1)

Os, Ir

This answer is correct

Option 2)

Pt, Cr

This answer is correct

Option 3)

V , Fe

This answer is incorrect

Option 4)

Fe, Cr

This answer is incorrect

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