D & f block elements

Which of the following shows highest oxidation states?

• Sc

• Cr

• Mn

• Fe

Why is KMnO4 coloured?

• Due to d-d transition

• Due to f-f transition

• contains unpaired electrons

• Due to Charge transfer from O to Mn

Which of them is a correct statement with respect to π bonding in MnO4- ion?

• d orbitals of O overlaps with p orbitals of Mn.

• p orbitals of O overlaps with d orbitals of Mn

• d orbitals of both overlap

• P orbitals of both overlap

The common oxidation state of Lanthanoids is:

• +2

• +4

• +3

• +5

The element having highest melting point is

• Technitium

• Tungsten

• Chromium

• Molybdenum

The lanthanoid which is most paramagnetic is:

• Lanthanum

• Cerium

• Neodymium

• Thorium

3d orbitals are degenerate. What does it means?

• All 3d orbitals are in same order
• All 3d orbitals have different electron arrangement
• All 3d orbitals are in the same energy level
• All 3d orbitals have the same shape

What quantity is taken in the y-axis ?

• Melting point

• Boiling point

• M²⁺/M Standard Electrode Potentials

• Standard hydration enthalpy of M²⁺

If violet region is absorbed, what is the color that we see. Refer to color wheel

• Violet
• Orange
• Blue
• Yellow

Sc³⁺ solution in the presence of water is colorless. Why?

• Presence of ligands cause the splitting of 3d orbital.
• There is no splitting of 3d orbitals
• There is no electrons to be excited
• Energy level is too high for electron to reach