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Oxides of Sulphur

Chromyl chlor...

Question

Chromyl chloride vapours are dissolved in water and solution is treated with acetic acid and lead acetate solution is added, then :

A

the solution will remain colourless

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B

the solution will become dark green

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C

a yellow solution will be obtained

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D

a yellow precipitate will be obtained

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Solution

The correct option is D a yellow precipitate will be obtained
${C r}_{2} {C l}_{2} + 2 H_{2} O \to 2 H C l + H_{2} {C r O}_{4}$
(chromyl chloride) (chomic acid) (yellow solution)
$H_{2} {C r O}_{4} + {({C H}_{3} C O O)}_{2} P b {C H}_{3} C O O H - -------- \to P b C r O_{4} ↓ + 2 {C H}_{3} C O O H$
(yellow ppt.)

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Similar questions

Q. A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute sulphuric acid but does not give precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution will consist of:

K C l

, when heated with solid

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, gives red vapours (a) that turn

N a O H

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?

Q. Potassium chromate solution is added to an aqueous solution of a metal chloride. The precipitates thus obtained are insoluble in acetic acid. These are subjected to flame test. Then the color of the flame is?

When a white crystalline compound X is heated with

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow-colored solution B is obtained. Neutralizing the solution of B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with

N a O H

solution, a colorless gas is evolved and on passing this gas into

K_{2} H g I_{4}

solution, a reddish-brown precipitate D is formed.

Q. To aqueous solution of

X

C u S O_{4}

a brown precipitate is obtained which turns white on adding of excess of

N a_{2} S_{2} O_{3}

solution; on addition of

A g^{+}

ion solution, a yellow curdy precipitate is obtained which is insoluble in

N H_{4} O H

X

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