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FeCl(3) is acidic towards litmus. On tre...

`FeCl_(3)` is acidic towards litmus. On treatment with excess of `NH_(4)SCN` it gives red coloured compound (A) and on treatment with excess of `K_(2)Cr_(2)O_(7)` in the presence of conc. `H_(2)SO_(4)`, it evolves deep red vapours of (B) on passing the vapours of (B) into `NaOH`, then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C)
What is the hybridisation of chromium in compound (C) ?

A

`sp^(3)d`

B

`sp^(3)`

C

`dsp^(2)`

D

`sp^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
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(i) An aqueous solution of a compound (A) is acidic towards litmus and (A) sublimes at about 300^(@)C . (ii) (A) on treatment with an excess of NH_(4)SCN gives a red coloured compound (B) and on treatment with a solution of K_(4)[Fe(CN)_(6)] gives a blue coloured compound (C). (iii) (A) on heating with excess of K_(2)Cr_(2)O_(7) in the presence of concentrated H_(2)SO_(4) evolves deep red vapours of (D). (iv) On passing the vapour of (D) into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of compound (E) is obtained. Identify (A) to (E) and give chemical equations for the reactions.

(i) An aqueous solution of a compound A is acidic towards litmus and A is sublimed at about 300^(@) C. (ii) A on treatment withh an excess of NH_(4)SCN gives a red coloured B and on treatment with a solution of K_(4)[Fe(CN)_(6)] gives a red coloured compound B and on treatment withh a solution of K_(4)[Fe(CN)_(6)] gives a blue coloured compound C. (iii) A on heating with excess of K_(2)Cr_(2)O_(7) in presence of concentrated H_(2)SO_(4) evolves deep red vapours of D. (iv) On passing the vapours of D into a solution of NaOH and then adding the solutions of acetic acid and lead acetate, a yellow precipitate of compound E is obtained. Identify A to E and give chemical equations for the reactions at steps (ii) to (iv).

Knowledge Check

  • FeCl_(3) is acidic towards litmus. On treatment with excess of NH_(4)SCN it gives red coloured compound (A) and on treatment with excess of K_(2)Cr_(2)O_(7) in the presence of conc. H_(2)SO_(4) , it evolves deep red vapours of (B) on passing the vapours of (B) into NaOH , then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) The compound B is

    A
    `NO_(2)`
    B
    `Br_(2)`
    C
    `CrO_(2)Cl_(2)`
    D
    `CrOCl_(4)`

  • FeCl_(3) is acidic towards litmus. On treatment with excess of NH_(4)SCN it gives red coloured compound (A) and on treatment with excess of K_(2)Cr_(2)O_(7) in the presence of conc. H_(2)SO_(4) , it evolves deep red vapours of (B) on passing the vapours of (B) into NaOH , then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) The compound A is

    A
    `Fe(SCN)_(2)`
    B
    `Fe(SCN)_(3)`
    C
    `FeCl_(3)`
    D
    `NH_(4)[Fe(CN)_(4)]`

  • (i) An aqueous solution of a compound A is acidic towards litmus and A sublimes at about 300^(@)C (ii) A solution of A, on treatment with an excess of NH_(4)SCN , gives a red compound, and on treatment with a solution of K_(4)[Fe(CN)_(6)] , gives a blue compound. (iii) The solid A, on being heated with an excess of K_(2)Cr_(2)O_(7) in the presence of concentrated H_(2)SO_(4) , evolves deep red vapours of D. (iv) On passing the vapours of D into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of a compound E is obtained. Q. Can compound A be prepared in the anhydrous form by strongly heating its hydrated crystals?

    A
    No, because the water molecules are very stongly bound in the hydrated crystals
    B
    No, because the salt gets hydrolysed in the process
    C
    Yes, because the water molecules are loosely bound in the hydrated crystals
    D
    yes, because the salt sublimes at `300^(@)C`

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    An aqueous solution of a compound (A) is acidic towards litmus and the solid has the property to sublime at 300^(@)C . The compound (A) on treatement with an excess of NH_(4)SCN gives a red coloured compound (B) an on treatement with a solution of K_(4)[Fe(CN)_(6)] gives a blue coloured compound (C ) . The compound (A) on heating with excess of K_(2) Cr_(2) O_(7) and concentrated H_(2)SO_(4) evolves deep red vapours of (D) . On passing these vapours through NaOH solution and then adding acetic acid and lead acetate solutions, a yellow precipitate of compound (E ) is obtained . Identify compounds ( A) to (E ) and give balanced chemical equation for each reaction involved.

    The aqueous solution of (C) on treatment with conc. H_(2)SO_(4) gives a orange coloured compound (E).

    When a mixture of solid NaCl , solid K_(2)Cr_(2)O_(7) is heated with conc. H_(2)SO_(4) , orange red vapours are obtained of the compound

    Which of the following on heating with K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) with organge red color vapours ?

    Oxalic acid on treatment with conc. H_(2) SO_(4) gives

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