Q.
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By Expert Faculty of Sri Chaitanya
a
In the lanthanide series the electrons occupy 4f-orbtals 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
answer is A.
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