Which of the following statements is correct?

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Option $A$ is incorrect because the conversion of chromate to dichromate occurs in acidic medium $(pH < 7)$,not basic. The correct reaction is $2C

Vedclass · Accepted Answer

$+2$ oxidation state is shown by $Ce, Tb$

Vedclass · Answer

(D) Option $A$ is incorrect because the conversion of chromate to dichromate occurs in acidic medium $(pH Option $B$ is incorrect because $I^-$ is oxidized to $I_2$ by $KMnO_4$ in acidic medium,not $IO_3^-$.Option $C$ is incorrect because Misch metal is an alloy consisting of a lanthanoid metal (typically $Ce$ $\approx 50\%$,$La$ $\approx 25\%$,$Nd$ $\approx 18\%$,$Pr$ $\approx 5\%$) and iron ($Fe$ $\approx 5\%$).Option $D$ is correct because $Ce$ and $Tb$ are known to exhibit the $+2$ oxidation state in addition to their common $+3$ state.

List-$I$ (Element)	List-$II$ (Block)
$(A)$ $Ra$	$(I)$ $p$-block
$(B)$ $Uuq$	$(II)$ $s$-block
$(C)$ $Ds$	$(III)$ $f$-block
$(D)$ $Fm$	$(IV)$ $d$-block

Similar Questions

Discuss the magnetic properties of transition elements.

Which of the following compounds is colourless?

Match the following:
List-$I$ (Element) List-$II$ (Block)
$(A)$ $Ra$ $(I)$ $p$-block
$(B)$ $Uuq$ $(II)$ $s$-block
$(C)$ $Ds$ $(III)$ $f$-block
$(D)$ $Fm$ $(IV)$ $d$-block

The correct answer is

Assertion : $E^o$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$.
Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.

$d$-block elements form alloys easily because......

Vedclass Test Series

Exam Paper Generator

Online Exam Module