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Potassium dichromate is used as'lab reag...

Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.
`(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V`
When`H_(2)O_(2)` is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct `PyCro(O_(2))_(2)` In alkaline solution, `K_(2)Cr_(2)O_(7)` with 30% `H_(2)O_(2)` a red-brown compound `Y (K_(3) CrO_(8)` is formed. In ammonia solution the dark red-brown compound. `Z [(NH_(3)),CrO_(4)]` is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cations
QWhich of the following cations can be identified by using `Na_(2) CrO_(4)` solution?
`Ba^(2+)`
`Pb^(2+)`
`Ag^(+)`(IV) `Sr^(2+)`

A

(I), (II)

B

(I) (I)(III)

C

(I), (III)

D

(I), (II), (III), (IV)

Text Solution

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To solve the problem of identifying which cations can be detected using sodium chromate (Na₂CrO₄) solution, we will analyze the behavior of each cation when reacted with sodium chromate. ### Step-by-Step Solution: 1. **Understand the Role of Sodium Chromate**: Sodium chromate is used as a reagent to identify certain cations based on the formation of colored precipitates. 2. **Identify the Cations**: The cations given in the question are: - Ba²⁺ (Barium) ...
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Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis. (1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V When H_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cations QThe number of moles of Cr_(2)O_(7)^(2-) required in acidic medium to oxidize 1 mol of ferric oxalate is

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