Q.

Which of the following statement is/are correct?

Moderate

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By Expert Faculty of Sri Chaitanya

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

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

Law of octave was presented by Newland.

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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