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Valency and Oxidation States

Which of the ...

Question

Which of the following metal have only one oxidation state?

C o

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F e

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S c

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A l

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Solution

The correct options are
C $S c$
D $A l$
$S c, A l$ has only one oxidation state i.e. +3.
$C o, F e$ has various oxidation states; most common are +2 and +3.

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Similar questions

V^{2 +} < C r^{2 +} < M n^{2} < F e^{2 +}

N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}

C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}

S c < T i < C r < M n

E_{M^{3 +} / M^{2 +}}^{o}

C r

M n

F e

C o

- 0.41

+ 1.57

0.77

1.97

S c (Z = 21)

Z n (Z = 30)

+ 3

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