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Standard IX

Chemistry

Identification Test for Salts

Potassium chr...

Question

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?

Lilac

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Apple green

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Crimson red

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Golden yellow

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Solution

The correct option is C Apple green
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; the color of the flame is apple green.
Chromium formed in the borax-bead test in oxidizing flame is $C u {(B O_{2})}_{3}$ It gives green color in hot and cold oxidizing flame.

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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 gives no precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution consists of:

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Q. Assertion :Potassium chromate solution in acetic acid precipitates only

B a^{2 +}

B a C r O_{4}

in group V. Reason:

S r C r O_{4}

and

C a C r O_{4}

are not precipitated with potassium chromate solution in acetic acid.

Q. A metal chloride

X

shows the following reactions.
(i) When

H_{2} S

is passed in an acidified aqueous solution of

X

, a black precipitate is obtained
(ii) The precipitate obtained at step (i) is not soluble in yellow ammonium sulphide.
(iii) When a solution of stannous chloride is added to an aqueous solution of

X

, a white precipitate is obtained which turns grey on addition of more of stannous chloride.
(iv) When an aqueous solution of

K I

is added to an aqueous solution of (

X

), a red precipitate is obtained which dissolves on addition of excess of

K I

.
Identify

X

Q. A black coloured compound

(A)

on reaction with dilute

H_{2} S O_{4}

gives a gas

(B)

which on passing in a solution of an acid

(C)

gives a white turbidity

(D)

. Gas

(B)

when passed in an acidified solution of a compound

(E)

gives a precipitate

(F)

soluble in dil.

H N O_{3}

. After boiling this solution when an excess of

N H_{4} O H

is added, a blue coloured compound

(G)

is formed. To this solution on addition of acetic acid and aqueous

K_{4} [F e (C N)_{6}]

a chocolate precipitate

(H)

is obtained. On addition of an aqueous soluion of

B a C l_{2}

to an aqueous solution of

(E)

, a white precipitate insoluble in

H N O_{3}

is obtained. Identify

(G)

and

(H)

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