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Acidity of Carboxylic Acids

Cr2O7 2- is a...

Question

Cr2O7 2- is a strong oxidising agent in acidic medium whereas WO3 and MoO3 are not

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Solution

Dear student,
In acidic medium, Cr(VI) in the form of dichromate is a strong oxidizing agent where MoO3 and WO3 are not because:

1) Mo(VI) and W(VI) are more stable than Cr(VI)

2) Higher oxidation states of heavier members of group-6 of transition series are more stable.
Regards,

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Q. In the form of dichromate,

C r (V I)

is a strong oxidising agent in acidic medium but

M o (V I)

M o O_{3}

W (V I)

W O_{3}

are not because:

Q. Which of the following is/are not oxidising agents in acidic medium?

Q. In acidic medium

C r_{2} O_{7}^{- 2}

is an oxidising agent

C r_{2} O_{7}^{- 2} + 14 H^{+} + 6 e^{-} \to 2 C r^{+ 3} + 7 H_{2} O

[E^{\circ} {C r}_{2} O_{7}^{- 2} / C r^{+ 3} = 1.33 V]

The electrode potential of half cell at pH = 1 keeping concentration of other species unity is:

C r (V I)

in the form of dichromate in acidic medium is a strong oxidising agent where

M o O_{3}

W O_{3}

are not. Reason: In d-block elements higher oxidation states are favoured by heavier members.

(I I)

compounds are powerful reducing agents whereas lead

(I V)

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