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?
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?
A
`Br_(2)`
B
`Cl_(2)`
C
`CrO_(2)Cl_(2)`
D
`Cr(OCl)Cl`
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The correct Answer is:
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.
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. Which of the following reactions takes place in (ii) ?
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Which of the following salt on heating with solid K_(2)Cr_(2)O_(7) and Conc. H_(2)SO_(4) , orange red vapours are evolved which turn NaOH solution yellow.
Which of the following salt on heating with solid K_(2)Cr_(2)O_(7) and Conc. H_(2)SO_(4) , orange red vapours are evolved which turn NaOH solution yellow.
A
`NaBr`
B
`NaCl`
C
`NaNO_(2)`
D
`Nal`
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. What is the oxidation sate of the central atom in the anion constituting the yellow precipitate obtained in (iii)?
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. What is the oxidation sate of the central atom in the anion constituting the yellow precipitate obtained in (iii)?
A
0
B
`+2`
C
`+4`
D
`+6`
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. The vapours obtained in (iii) contain:
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. The vapours obtained in (iii) contain:
A
`CrO_(2)Cl_(2) and I_(2)`
B
`CrO_(2)Cl_(2)` only
C
`I_(2)` only
D
`CrO_(2)Br_(2)`
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When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. The original mixture contains:
When an aqueous solution of a colourless mixture of two salts is treated with a drop of chlorine water, the solution becomes brown. Some chloroform is added to the brown solution and the resulting mixture is shaken wel. The chloroform layer becomes violet. (ii) When chlorine water is again added dropwise to the above mixture, the chloroform layer becomes colourless. (iii) On being heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , the solid mixture gives vapours of a dark colour which form a yellow solution with aqueous NaOH. On acidification with acetic acid followed by treatment with lead acetate, the yellow solution gives a yellow precipitate. (iv) When boiled with an NaOH solution, the mixture gives a gas that produces thick white fumes with HCl vapours and turns nessler's reagent brown. the mixture does not respond to any other test for cations. (v) The mixture, on being heated, gets completely sublimed. Q. The brown solutin obtained in (i) is due to:
Which of the following solid salt on heating with solid K_(2)Cr_(2)O_(7) and concentration H_(2)SO_(4) orange red vapours are evolved which turn aqueous NaOH solution yellow?
Which of the following soled salt on heating with solid K_(2)Cr_(2)O_(7) and conc. H_(2)SO_(4) orange red vapours are evolved which turn aquous NaOH solution yellow?
Which of the following soild salt on heating with K_(2) Cr_(2)O_(7) and cone. H_(2) SO_(4) , orange-red vapours are evolved which turn aqueous NaOH solution yellow ?
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