The d-and f-Block Elements Quiz-1

Question 1

Transition elements have the maximum tendency to form complexes because

Accepted Answer

they contain incompletely filled d-orbitals & their charge/size ratio is quite large

Answer

they are metals and all metals form complexes

Answer

they contain incompletely filled d-orbitals

Answer

their charge/size ratio is quite large

Question 2

In a transition series, as the atomic number increases, paramagnetism

Accepted Answer

first increases to a maximum and then decreases

Answer

increases gradually

Answer

decreases gradually

Answer

first decreases to a minimum and then increases

Question 3

Which of the following transition metal ions will have definite value of magnetic moment?

Accepted Answer

$Ti^{3+}$

Answer

$Sc^{3+}$

Answer

$Cu^+$

Answer

$Zn^{2+}$

Question 4

Cuprous ion is colourless, while cupric ion is coloured because

Accepted Answer

cuprous ion has a complete d-orbital and cupric ion has an incomplete d-orbital

Answer

both have unpaired electrons in the d-orbital

Answer

both have half-filled p- and d-orbitals

Answer

cuprous ion has incomplete d-orbital and cupric ion has a complete d-orbital

Question 5

The magnetic moment of a transition metal of 3d-series is 6.92 B.M. Its electronic configuration would be

Accepted Answer

$3d^54s^1$

Answer

$3d^54s^2$

Answer

$ 3d^64s^0$

Answer

$3d^54s^0$

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