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Which of the following statement is wron...

Which of the following statement is wrong?

A

In the lanthanide series the electrons occupy `4f`-orbitals in preference to `5d` the and `6p`-orbitals.

B

Zero group was not present in the periodic table when Mendeleev presented it.

C

Law of octave was presented by Newland.

D

Cuprous compounds are coloured while cupric compounds are colourless.

Text Solution

Verified by Experts

The correct Answer is:
D
(d) Statement (d) is wrong.
`Cu(Z = 29), 3rd^(10), 4s^(1)`
`Cu^(o+)` (cuprous) `= 3d^(10) 4s^(0)`
`Cu^(2+)` (cupric) `= 3d^(9) 4s^(0)` (one unpaired electron and hence is coloured).
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