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A white cryst...

Question

A white crystalline solid $A$ on boiling with caustic soda solution gave a gas $B$ which when passed through an alkaline solution of potassium mercuric iodide gave a brown ppt. The substance $A$ on heating gave a gas $C$ which rekindled a glowing splinter but did not give brown fumes with nitric oxide. The gas $B$ is?

A

H_{2} S

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B

N H_{3}

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C

H C l

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D

C O_{2}

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Solution

The correct option is B $N H_{3}$

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Q. A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of potassium tetraiodomercurate (II) solution gives a brown ppt. The substance 'A' on heating evolves a neutral gas 'C', which is inert at room temperature and reactive in presence of the catalyst and does not give brown fumes with nitric oxide.

The substance 'A' is___________.

Q. An orange solid (A) on heating gave a green residue (B), a colourless gas (C) and water vapours. The dry gas (C) on passing overheated Mg gave a white solid (D). (D) on reaction with water gave a gas (E) which formed dense white fumes with HCl.

Write the mass number of gas C(gms).

An aqueous solution of salt (A), gives white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) is dissolves in hot water and the solution gives a yellow precipitate (D) on treating with NaI and cooling. The compound (A) does not give any gas with dilute HCl but liberates reddish brown gas on heating.

Compound (B) is:

Q. A white substance (A) on heating with excess of dil HCI gave an offensive smelling gas (B) ans a solution (C). Solution (C) on treatment with aqueous

{N H}_{3}

did not give any precipitate but on treatment with NaOH solution gave a precipitate (D) which dissolves in excess of NaOH solution.
(A) on strong heating in air gave a strong smelling gas (E) and a solid (F). Solid (F) dissolved completely in HCI and the solution gave a precipitate with

{B a C I}_{2}

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Q. An aqueous solution of salt (A) gives a white crystalline precipitate (B) with NaCl solution. The filtrate gives a black precipitate (C) when

H_{2} S

is passed through it. Compound (B) dissolves in hot water and the solution gives yellow precipitate (D) on treatment with potassium iodine and on cooling. The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating. Compounds (A) to (D) are identified as:

P b (N O_{3})_{3}

P b C l_{2}

P b S

P b I_{2}

If true enter 1, else enter 0.

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