Compound $X$ is tested and the results are shown in the table:
Text Result
* aqueous sodium hydroxide is added, then heated gently
* dilute hydro chloric acid is added * Gas given off which turns damp red litmus paper blue
* effervescence, gas given off which turns lime water milky and acidified $K_{2} C r_{2} O_{7}$ paper green
Which ions are present in compound $X$ ?

Ammonium ions and sulphite ions

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Ammonium ions and carbonate ions

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Sodium ions and carbonate ions

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Ammonium ions and sulphate ions

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Solution

The correct option is A Ammonium ions and sulphite ions
Ammonium ions and sulphite ions are present in compound $X$ .
(I) Aqueous sodium hydroxide is added, then heated gently.
Ammonia gas given off which turns damp red litmus paper blue.
(II) Dilute hydro chloric acid is added.
The effervescence of $S O_{2}$ gas given off which turns lime water milky and acidified $K_{2} C r_{2} O_{7}$ paper green.

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Similar questions

Q. From the list given below, select the word(s) required to correctly complete the blanks (i) to (v) in the following passage:
Ammonia, Ammonium, Carbonate, Carbon dioxide, Hydrogen, Hydronium, Hydroxide, Precipitate, Salt, Water.
A solution 'X' turns blue litmus red so it must contain (i) ________ ions; another solution 'Y' turns red litmus blue and therefore must contain (ii) _________ ions. When X and Y are mixed together, the products will be a (iii) ________ and (iv) _________. If a piece of magnesium was put into solution X, (v) ________ gas would be evolved.

Q. When ammonium chloride and ammonium hydroxide are added to a solution containing both

{A l}^{3 +}

and

{C a}^{2 +}

ions, which ion is precipitated first and why?

X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).

(a) A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.

INFERENCE 1 : The common anion is the .................. ion.

(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.

INFERENCE 2 : The cation in X is either ................ or ....................

(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the test tube.

INFERENCE 3 : The metal ion present in Y is the .................... ion.

(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE 4 : Z contans the ............ cation.

(e) Write the equations for the following reactions:

(1) X and concentrated sulphuric acid (below $200^{\circ}$ ). (One equation only for either of the cations given in INFERENCE 2).

(2) Action of heat on Y.

(3) Concentrated nitric acid is added to copper turnings kept in a beaker.

Q. Which of the following indicate(s) a basic solution?
i. Litmus paper turns blue
ii. Phenolphthalein turns pink
iii. Hydronium ion concentration is greater than hydroxide ion concentration

Q. In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide?

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Text	Result
* aqueous sodium hydroxide is added, then heated gently * dilute hydro chloric acid is added	* Gas given off which turns damp red litmus paper blue * effervescence, gas given off which turns lime water milky and acidified $K_{2} C r_{2} O_{7}$ paper green