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Oxides of Nitrogen

i An inorgani...

Question

(i) An inorganic iodide (A) on heating with a solution of $K O H$ gives a gas (B) and the solution of a compound (C).
(ii) The gas (B) on ignition in air gives a compound (D) and water.
(iii) Copper sulphate is finally reduced to the metal on passing (B) through its solution.
(iv) A precipitate of compound (E) is formed on reaction of (C) with ${C u S O}_{4}$ solution.Identify (A) to (E) and explain reactions (i) to (iv).

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Solution

The inorganic iodide (A) is ${P H}_{4} I$
(i) On heating with a solution of $K O H$ , it gives a gas (B) which is phosphine and the solution of a compound (C) which is potassium iodide.
${P H}_{4} I + K O H Δ \to {P H}_{3} + H_{2} O + K I$
(ii) ${P H}_{3}$ on ignition in air gives a compound (D) which is $P_{2} O_{5}$ and water.
${2 P H}_{3} + {4 O}_{2} ⟶ P_{2} O_{5} + {3 H}_{2} O$
(iii) Copper sulphate is finally reduced to the metal on passing phosphine through its solution.
${3 C u S O}_{4} + {2 P H}_{3} ⟶ {C u}_{3} P_{2} + {3 H}_{2} {S O}_{4}$
${C u}_{3} P_{2} + {5 C u S O}_{4} + {8 H}_{2} O ⟶ 8 C u + 2 H_{3} {P O}_{4} + {5 H}_{2} {S O}_{4}$
(iv) A precipitate of compound (E) (which is ${C u}_{2} I_{2}$ ) is formed on reaction of KI with ${C u S O}_{4}$ solution.
${2 C u S O}_{4} + 4 K I ⟶ {C u}_{2} I_{2} ↓ + {2 K}_{2} {S O}_{4} + I_{2}$

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Similar questions

Q. (i) A black mineral (A) on heating in presence of air gives a gas (B).
(ii) The mineral (A) on reaction with dilute

H_{2} S O_{4}

gives a gas (C) and solution of a compound (D).
(iii) On passing gas (C) into an aqueous solution (B), a white turbidity is obtained.
(iv) The aqueous solution of compound (D) on reaction with potassium ferricyanide gives a blue compound (E).

Compounds (A) to (E) are identified as:

F e S

S O_{2}

H_{2} S

F e S O_{4}

K F e^{I} I [F e^{I} I I (C N)_{6}]

If true enter 1, else enter 0.

A black colored compound (A) on reaction with

d i l . H_{2} S O_{4}

gives a gas (B) which on passing in a solution of acid (C) gives white turbidity (D). Gas (B) when passed in an acidified solution of a compound (E) gives a black precipitate (F) which is soluble in hot concentrated (C). After boiling this solution when an excess of ammonia solution is added, a blue-colored compound (G) is formed. To the solution of (E), on the addition of acetic acid and aqueous potassium ferrocyanide, a chocolate brown precipitate (H) is formed. On the addition of an aqueous solution of

B a C l_{2}

to an aqueous solution of (E), white precipitate insoluble in

H N O_{3}

The gas (B) on passing through an acid (C) gives white turbidity (D) because :

Q. A metal nitrate A on heating gives yellowish brown coloured metal oxide with brown gas B and a colourless gas C. aqueous solution of A on reaction with potassium iodide forms a yellow precipitate of compound D. Identify A, B, C, D. Also identify the types of both the reactions.

Q. A compound A having molecular formula

C_{4} H_{9} B r

on reaction with alcoholic

K O H

gives a compound B. Bromination of B gives compound C. compound C on treatment with soda lime gives a gaseous compound D. The gas D when passed through ammonical silver nitrate solution forms white precipitate. Identify A, B, C and D and write the reactions involved.

Q. A metal Nitrate 'A' on heating gives yellowish brown coloured metal oxide along with brown gas 'B' and a colourless gas 'C'. Aqueous solution of 'A' on reaction with potassium iodide forms a yollow precipitate of compound 'D'.Identify A,B,C,D.Also identify the type of both the reactions.

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