You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard X

Chemistry

Chemical Reaction

Z is a compou...

Question

Z is a compound. With dilute HCl it gives a gas turning dichromatic solution green. Z gives lilac flame. Name Z.

Open in App

Solution

'Z' is potassium sulphite (K₂SO₃). It burns with a lilac or pink flame. When potassium sulphite is warmed with dilute HCl, it reacts and releases sulphur dioxide gas, which turns dichromate solution (orange colour) green. The equation for the reaction between potassium sulphite and dilute HCl is given below:

$K_{2} {SO}_{3} (aq) + 2 HCl (aq) \to 2 KCl (aq) + H_{2} O (l) + {SO}_{2} (g) Potassium Potassium Sulphur dioxide sulphite chloride 3 {SO}_{2} (g) + K_{2} {Cr}_{2} O_{7} (aq) + H_{2} {SO}_{4} (aq) \to K_{2} {SO}_{4} (aq) + {Cr}_{2} {({SO}_{4})}_{3} (aq) + H_{2} O (l) Sulphur Acidified Potassium Potassium Chromium dioxide dichromate sulphate sulphate$

Suggest Corrections

Similar questions

Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

Compound

A

is a light-green crystalline solid. It gives the following tests :

(i) It dissolves in dilute sulphuric acid. No gas is produced.

(ii) A drop of

K M n O_{4}

is added to the above solution. The pink color disappears.

(iii) Compound

A

is heated strongly. Gases

B

and

C

, with a pungent smell, come out. A brown residue

D

is left behind.

(iv) The gas mixture (

B

and

C

) is passed into a dichromate solution. The solution turns green. But when only

C

is passed no change occurs.

(v) The green solution from step (iv) gives a white precipitate

E

with a solution of barium nitrate.

(vi) Residue

D

from step (iii) is heated on charcoal in a reducing flame. It gives a magnetic substance.

Thus, name the compound A is______ .

Q. A metal gives lilac colour in bunsen flame and the solution of its oxide turns red litmus paper blue. The metal is?

Name the anion [negative ion] present in the following compound:
Compound D when warmed with dilute H₂SO₄ give a gas which turns acidified potassium dichromate solution green.

Q. An unknown inorganic compound

(X)

loses its water of crystallisation. On heating its aqueous solution gives the following reacion:
(i) it gives a white turbidity with dilute

H C l

solution.
(ii) it decolourises a solution of iodine in

K I

.
(iii) it gives a white precipitate with

A g N O_{3}

solution which turns black on standing.
Identify compound

(X)

Join BYJU'S Learning Program