Explanation:
Monazite is a prosphate material containing rare earth metals. It is reddish in colour. It is an important ore for throium, lanthanum, cerium.
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The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of $Cr^{3+}$ ion is $...........$
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?