JEE MAIN - Chemistry (2024 - 5th April Morning Shift - No. 23)
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In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is _______ BM (Nearest integer) [Given atomic number of $$\mathrm{Cu}=29, \mathrm{Ni}=28, \mathrm{Mn}=25, \mathrm{Fe}=26$$]
Answer
6
Explanation
Green coloured salt bead represents the metal ion taken is $$\mathrm{Fe}^{3+}$$ so, $$\mathrm{Fe}^{3+}:[\mathrm{Ar}] 4 \mathrm{~s}^0 3 d^5$$
So, $$\mu=\sqrt{5 \times 7}=5.9=6$$
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