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(i) An aqueous solution of a compound A ...

(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`

Text Solution

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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.

Identify A to C. (a). An aqueous solution of a compoud (A) is acidic towards litmus and (A) is sublimed at about 300^@C . (b). (A) on treatment with an excess of NH_4CNC gives a red coloured compound (B) and on treatment with a solution of K_4Fe(CN)_6 gives a blue coloured compound (C).

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

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

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) ?

Solid KCl, when heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , gives red vapours (a) that turn NaOH solution yellow (b). The yellow solution, when acidified with acetic acid and treated with lead acetate, gives a yellow precipitate (c). which of the following is true with respect to a, b and c?

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VK JAISWAL-QUALITATIVE INORGANIC ANALYSIS-LEVEL 3
  1. (i) An aqueous solution of a compound (A) is acidic towards litmus and...

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  2. (i) An aqueous solution of a compound (A) is acidic towards litmus and...

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  3. (i) An aqueous solution of a compound A is acidic towards litmus and A...

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  4. (i) A yellow precipiate of the compound A is formed on passing H(2)S t...

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  5. (i) A yellow precipiate of the compound A is formed on passing H(2)S t...

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  6. (i) A yellow precipiate of the compound A is formed on passing H(2)S t...

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  7. (i) A yellow precipiate of the compound A is formed on passing H(2)S t...

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  8. Q. The white precipitate obtained in step (2) when filtered, washed wi...

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  9. Q. What will happen if the white precipitate obtained in step (9) is t...

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  10. An aqueous solution of a white salt A gives a white precipitate B on t...

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  11. An aqueous solution of a white salt A gives a white precipitate B on t...

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  12. An aqueous solution of a white salt A gives a white precipitate B on t...

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  13. When an aqueous solution of a colourless mixture of two salts is treat...

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  14. When an aqueous solution of a colourless mixture of two salts is treat...

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  15. When an aqueous solution of a colourless mixture of two salts is treat...

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  16. When an aqueous solution of a colourless mixture of two salts is treat...

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  17. When an aqueous solution of a colourless mixture of two salts is treat...

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  18. (i) A white solid mixture of two salts containing a common cations in ...

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  19. (i) A white solid mixture of two salts containing a common cations in ...

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  20. (i) A white solid mixture of two salts containing a common cations in ...

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