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The d-And-f-Block Elements
Question
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What is the oxidation state of chromium in (a) potassium dichromate, (b) potassium chromate?

Answer

Oxidation state of chromium in K2Cr2O7
oxidation state of K =1
oxidation state of O=(-2)
oxidation state of Cr= y
 
2 x1 +2 x y+(-2) x 7=0
2+2y-14=0
2+2y=14
2y=14-2
2y=12
y= 12/2
y=6

Oxidation state of chromium in K2CrO4
oxidation state of K =1
oxidation state of O=(-2)
oxidation state of Cr= y
2 x1+y+(-2) x4 =0
2 +y-8 =0
2+y=8
y=8-2
y=6

In both; K2Cr2O7 and K2CrO4, Cr is in +6 oxidation state.

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Some More Questions From The d-And-f-Block Elements Chapter

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.