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Q.

Select the incorrect statement:

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a

Sphalerite is an ore of zinc

b

Terbium (Tb) has 4f9 6s2 and Gadoliniurn (Gd) has 4f7 5s1 6s2 electronic configuration. The spin magnetic moment of Tb3+ is greater than Gd3+

c

All actinides have high densities except Th and Am.

d

Monazite is an ore of thorium

answer is B.

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Detailed Solution

Gd3+=4f7⇒n=7 (half filled) ∴μMM of Gd+3>Tb+3
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Select the incorrect statement: