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Salt A reacts with K(2)Cr(2)O(7) and con...

Salt A reacts with `K_(2)Cr_(2)O_(7)` and conc. `H_(2)SO_(4)` giving red fumes B,B when passed in `NaOH` giving colourless solution. Salt A is:

A

`Cl^(-)` salt

B

`Br^(-)` salt

C

`I^(-)` salt

D

`NO_(3)^(-)` salt

Text Solution

Verified by Experts

The correct Answer is:
B
`Br_(2)+OH^(-)rarr Br^(-)+BrO^(-)+H_(2)O`
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A mixture of K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) forms

A solid laboratory reagent (A) give following reactions. (i) It impart green colour of flame : (ii) Its solution does not give ppt. on passong H_(2)S . (iii) When it is heated with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) , a red gas (B) is evolved. The gas when passed in aq. NaOH solution turns it yellow (C). Identify (A), (B), (C) giving chemical reactions.

Knowledge Check

  • Aniline when treated with K_2 Cr_2 O_7 in conc H_2 SO_4 gives :

    A
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  • Assertion: Br^(-) ions do not interfere in the chromyl chloride test forr chlorides. Reason: A bromide, on oxidation with K_(2)Cr_(2)O_(7)// concentrated H_(2)SO_(4) , liberates Br_(2) , which dissolves in NaOH to give a colourless solution.

    A
    If assertion is true but the reason is false
    B
    If assertion is false but reason is true
    C
    If both assertion and reason are true and reason is the correct explanation of assertion
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    If oth assertion and reason are true but reason is not the correct explanation of assertion

  • Assertion : Br^(Θ) ions do not interfere in the chromyl chloride test for chloorides Reasion : A bromide on oxidation with K_(2)Cr_(2)O_(7) concentrates H_(2)SO_(4) liberates Br_(2) which dissolve in NaOH to give a colourless solution

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    B
    If both (A) and (B) are correct but (R ) is not the correct explqanation of (A)
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    If (A) is correct ,but (R ) is incorrect
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    If (A) is incorrect ,but (R ) is correct

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    A colourless inorganic compound (A) imparts a green colour to flame. Its solution does not give white precipitate with H_(2)S . Its solution gives white precipitate with conc. H_(2)SO_(4) which is insoluble in dil. H_(2)SO_(4) . When it is heated with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) , a red gas is evolved. The gas when passed through aqueous NaOH solution turns it Yellow. Identify the compound (A) and give chemical reactions.

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