Match the properties given in List-$I$ with the elements given in List-$II$:
List-$I$ (Property) List-$II$ (Element) $(A)$ Lanthanoid showing $+4$ oxidation state $(i)$ $Pm$ $(B)$ Lanthanoid showing $+2$ oxidation state $(ii)$ $Ce$ $(C)$ Radioactive lanthanoid $(iii)$ $Lu$ $(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state $(iv)$ $Eu$ $(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state $(v)$ $Gd$ - $(vi)$ $Dy$
| List-$I$ (Property) | List-$II$ (Element) |
| $(A)$ Lanthanoid showing $+4$ oxidation state | $(i)$ $Pm$ |
| $(B)$ Lanthanoid showing $+2$ oxidation state | $(ii)$ $Ce$ |
| $(C)$ Radioactive lanthanoid | $(iii)$ $Lu$ |
| $(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state | $(iv)$ $Eu$ |
| $(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state | $(v)$ $Gd$ |
| - | $(vi)$ $Dy$ |
(A) $(A) \rightarrow (ii)$ ($Ce^{4+}$ is stable due to noble gas configuration).
$(B) \rightarrow (iv)$ ($Eu^{2+}$ is stable due to $4f^7$ configuration).
$(C) \rightarrow (i)$ ($Pm$ is the only radioactive lanthanoid).
$(D) \rightarrow (v)$ ($Gd^{3+}$ has $4f^7$ configuration).
$(E) \rightarrow (iii)$ ($Lu^{3+}$ has $4f^{14}$ configuration).
$(B) \rightarrow (iv)$ ($Eu^{2+}$ is stable due to $4f^7$ configuration).
$(C) \rightarrow (i)$ ($Pm$ is the only radioactive lanthanoid).
$(D) \rightarrow (v)$ ($Gd^{3+}$ has $4f^7$ configuration).
$(E) \rightarrow (iii)$ ($Lu^{3+}$ has $4f^{14}$ configuration).
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Given below are two statements:
Statement $I$: In the Lanthanoids,the formation of $Ce^{+4}$ is favoured by its noble gas configuration.
Statement $II$: $Ce^{+4}$ is a strong oxidant reverting to the common $+3$ state.
In the light of the above statements,choose the most appropriate answer from the options given below:
Statement $I$: In the Lanthanoids,the formation of $Ce^{+4}$ is favoured by its noble gas configuration.
Statement $II$: $Ce^{+4}$ is a strong oxidant reverting to the common $+3$ state.
In the light of the above statements,choose the most appropriate answer from the options given below:
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Match the element/compound given in List-$I$ with the uses given in List-$II$:
List-$I$ (Element/Compound) List-$II$ (Use) $A$. Lanthanoid oxide $1$. Production of iron alloys $B$. Lanthanoid $2$. Television screens $C$. Mischmetal $3$. Petroleum cracking $D$. Magnesium based alloy $4$. Lanthanoid metal $+$ iron $E$. Mixed lanthanoid oxides $5$. Bullet tips $6$. $X$-ray screens
| List-$I$ (Element/Compound) | List-$II$ (Use) |
| $A$. Lanthanoid oxide | $1$. Production of iron alloys |
| $B$. Lanthanoid | $2$. Television screens |
| $C$. Mischmetal | $3$. Petroleum cracking |
| $D$. Magnesium based alloy | $4$. Lanthanoid metal $+$ iron |
| $E$. Mixed lanthanoid oxides | $5$. Bullet tips |
| $6$. $X$-ray screens |
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