The action of heat on the blue crystalline solid X, gives a reddish gas Y, a gas which re-lights a glowing splint and leaves a black residue. When gas Z, which has a rotten egg smell, is passed through a solution of X, a black ppt. is formed.

(a) Identify X, Y and Z.

(b) Write equation for action of heat on X.

(c) Write equation between solution of X and gas Z.

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Solution

(a) X= Copper nitrate,
Y= Nitrogen dioxide,
Z = Hydrogen sulphide

(b) $2 C u (N O_{3})_{2} ⟶ 2 C u O + 4 N O_{2} + O_{2}$

(c). $C u (N O_{3})_{2} + H_{2} S ⟶ C u S + 2 H N O_{3}$

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Q. The action of heat on the blue crystalline solid A, gives a reddish brown gas B, a gas which re-lights a glowing splint and leaves a black residue. When gas C, which has a rotten egg smell, is passed through a solution of A, a black ppt. is formed.
(a) Identify A, B and C
(b) Write an equation for the action of heat on A.
(c) Write equation between solution of A and gas C. [5 MARKS]

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.

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

The action of heat on Y produces a reddish brown gas and a yellow residue which fuses with the glass of the test tube A reddish-brown gas is obtained when Y is warmed with concentrated sulphuric acid and copper turnings added to mixture.

Action of heat on Y.

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