d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 190

Question 946

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According to the text, what condition favors the formation of chromate ions (CrO4^2-) in aqueous solution?

Acidic conditions (low pH)
Basic conditions (high pH)
Neutral conditions only
Temperature changes

Question 947

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What is the main difference in the structures of chromate (CrO4^2-) and dichromate (Cr2O7^2-) ions as described?

Chromate is linear, dichromate is tetrahedral
Chromate is tetrahedral, dichromate consists of two tetrahedra sharing a corner
Both are tetrahedral
Chromate consists of two tetrahedra, dichromate is tetrahedral

Question 948

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In the preparation of KMnO4, what is the purpose of the electrolytic oxidation step?

To reduce permanganate to manganate
To convert manganate (MnO4^2-) to permanganate (MnO4^-)
To precipitate MnO2
To neutralize the solution

Question 949

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What is the significance of the standard electrode potential (E° = 1.33 V) for the dichromate reduction half-reaction?

It indicates the reaction is slow
It indicates a strong tendency for the reduction to occur spontaneously
It shows the reaction requires energy input
It is only relevant at high temperatures

Question 950

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Why is the dichromate ion (Cr2O7^2-) considered a strong oxidizing agent?

Because it contains oxygen
Because it is brightly colored
Because chromium is in a high oxidation state (+6) which is readily reduced
Because it is a large ion