(B) $MnO_4^{2-}$ has one unpaired electron ($d^1$ configuration),so it is paramagnetic. Thus,statement $(a)$ is $F$.$(b)$ $MnO_4^-$ is purple and $MnO

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(B) $MnO_4^{2-}$ has one unpaired electron ($d^1$ configuration),so it is paramagnetic. Thus,statement $(a)$ is $F$.$(b)$ $MnO_4^-$ is purple and $MnO_4^{2-}$ is green. Thus,statement $(b)$ is $F$.$(c)$ $K_2Cr_2O_7$ is orange,not yellow. Thus,statement $(c)$ is $F$.$(d)$ $K_2Cr_2O_7$ is orange. Thus,statement $(d)$ is $T$.Therefore,the correct sequence is $a-F, b-F, c-F, d-T$.

Class 12 Chemistry d-and f-Block Elements Compounds of Transitional elements

Difficult

Identify the correct $(T)$ and incorrect $(F)$ statements from the following:
$(a)$ $MnO_4^{2-}$ is diamagnetic.
$(b)$ $MnO_4^-$ is green and $MnO_4^{2-}$ is purple.
$(c)$ $K_2Cr_2O_7$ is yellow.
$(d)$ $K_2Cr_2O_7$ is orange.

A
a-$T$,b-$F$,c-$F$,d-$T$
B
a-$F$,b-$F$,c-$F$,d-$T$
C
a-$T$,b-$T$,c-$F$,d-$F$
D
a-$F$,b-$T$,c-$T$,d-$F$

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Class 12

Chemistry Questions

Chapter

d-and f-Block Elements

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Compounds of Transitional elements

Among the following oxides of $3d$ elements,the number of mixed oxides are . . . . . .
$Ti_{2}O_{3}, V_{2}O_{4}, Cr_{2}O_{3}, Mn_{3}O_{4}, Fe_{3}O_{4}, Fe_{2}O_{3}, Co_{3}O_{4}$

DifficultJEE MAIN 2026

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Provide the structures of the following ions:
$1.$ $CrO_4^{2-}$
$2.$ $Cr_2O_7^{2-}$

Medium

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The colour of $K_2Cr_2O_7$ changes from red-orange to lemon-yellow on treatment with aqueous $KOH$ because of:

Easy

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What are the impurities present in ruby and sapphire?

Easy

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Stainless steel contains $..........$ $\%$ $Cr$.

Easy

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Identify the correct $(T)$ and incorrect $(F)$ statements from the following:$(a)$ $MnO_4^{2-}$ is diamagnetic.$(b)$ $MnO_4^-$ is green and $MnO_4^{2-}$ is purple.$(c)$ $K_2Cr_2O_7$ is yellow.$(d)$ $K_2Cr_2O_7$ is orange.

Similar Questions

Among the following oxides of $3d$ elements,the number of mixed oxides are . . . . . . $Ti_{2}O_{3}, V_{2}O_{4}, Cr_{2}O_{3}, Mn_{3}O_{4}, Fe_{3}O_{4}, Fe_{2}O_{3}, Co_{3}O_{4}$

Provide the structures of the following ions:$1.$ $CrO_4^{2-}$$2.$ $Cr_2O_7^{2-}$

The colour of $K_2Cr_2O_7$ changes from red-orange to lemon-yellow on treatment with aqueous $KOH$ because of:

What are the impurities present in ruby and sapphire?

Stainless steel contains $..........$ $\%$ $Cr$.

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Identify the correct $(T)$ and incorrect $(F)$ statements from the following:
$(a)$ $MnO_4^{2-}$ is diamagnetic.
$(b)$ $MnO_4^-$ is green and $MnO_4^{2-}$ is purple.
$(c)$ $K_2Cr_2O_7$ is yellow.
$(d)$ $K_2Cr_2O_7$ is orange.

Among the following oxides of $3d$ elements,the number of mixed oxides are . . . . . .
$Ti_{2}O_{3}, V_{2}O_{4}, Cr_{2}O_{3}, Mn_{3}O_{4}, Fe_{3}O_{4}, Fe_{2}O_{3}, Co_{3}O_{4}$

Provide the structures of the following ions:
$1.$ $CrO_4^{2-}$
$2.$ $Cr_2O_7^{2-}$