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Standard X
Chemistry
Roasting
CuFeS2 + O2 e...
Question

CuFeS2+O2(excess)Δ→X(s)+Y(s) (Unbalanced Equation):
Which is correct choice for (X) and (Y) ?

A
(X) liberates iodine from soluble iodides like KI
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B
(Y) on heating liberates SO3 only
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C
(X) forms bluish white ppt. with sodium hydroxide which redissolves in excess of sodium hydroxide
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D
(Y) on reaction with potassium ferricyanide gives brown ppt
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Solution

The correct option is A (X) liberates iodine from soluble iodides like KI
2CuFeS2+4O2→Cu2S+3SO2+2FeO

X=Cu2S,Y=FeO

Cu2S liberates I2 from KI

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Q.

Write the balanced chemical equations for the following reactions-

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu2I2), liberates iodine gas and also forms potassium sulphate.

Q. Identify the substances P, Q, and R in each case based on the information given below:
(i) The deliquescent salt P, turns yellow on dissolving in water, and gives a reddish brown precipitate with sodium hydroxide solution.
(ii) The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
(iii) The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.
Q. Copper sulphate on treatment with potassium iodide precipitates cuprous iodide, liberates iodine gas and also forms potassium sulphate. Write a balanced equation for the mentioned reaction.
Q. The gas liberated on heating a mixture of two salts with NaOH, give a reddish brown precipitate with an alkaline solution of K2Hgl4. The aqueous solution of the mixture on treatment with BaCl2 gives a white precipitate which is sparingly soluble in concentrated HCl. On heating the mixture with K2Cr2O7 and concentrated H2SO4, red vapour (A) are produced. The aqueous solution of the mixture gives a deep blue ppt. (B) with Potassium ferricyanide solution. Identify the radicals.
Q. Identify the substance 'Q' based on the information given below.
The white crystalline solid 'Q' is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.

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