Q.

Which of the following statement is/are correct?

Moderate

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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.

(Detailed Solution Below)

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Detailed Solution

Statement (a) is wrong.Cu(Z=29),3d10,4s1Cu⊕( cuprous )=3d104s0Cu2+( cupric )=3d94s0(one unpaired electron and hence is coloured)
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