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An Intiative by Sri Chaitanya
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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