Which material is used in the flint of a gas lighter?
- A$CeO_2$
- BPyrophoric mischmetal
- CGadolinium sulfate
- DAcid compounds
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The atomic number of cerium $(Ce)$ is $58$. The correct electronic configuration of $Ce^{3+}$ ion is
Describe the atomic and ionic radii of lanthanoids and explain lanthanoid contraction.
Identify the correct statements from the following.
$(i)$ $Eu^{2+}$ and $Yb^{2+}$ are reducing agents.
$(ii)$ The electronic configuration of $Pr^{3+}$ is $[Xe] 4f^3$.
$(iii)$ Aqueous solution of $LaCl_3$ is colourless.
$(i)$ $Eu^{2+}$ and $Yb^{2+}$ are reducing agents.
$(ii)$ The electronic configuration of $Pr^{3+}$ is $[Xe] 4f^3$.
$(iii)$ Aqueous solution of $LaCl_3$ is colourless.
Which of the following elements is not an actinoid?
Easy
View SolutionWhich of the following statements is incorrect?
Medium
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