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Preparations and Uses of Sodium Bicarbonate and Common Salt

An orange sol...

Question

An orange solid (A) on heating gives a green residue (B), a colorless gas (C) and water vapour. Another metal (M), giving brick red colour to Bunsen flame, mainly occurs in the form of its carbonate in the earth crust. When this metal carbonate is heated, it decomposes producing a compound (N) and $C O_{2}$ gas.

Compound (N), when reacted with coke at high temperatures, produce an industrially important compound (O). Compound (O) combines with gas (C) producing a mixture, which acts as a fertilizer. A component of this mixture contains an anion which is isoelectronic and isostructural with $C O_{2}$ gas.Gas (C) is also produced along with water vapour on heating a colourless salt (P). When either (A) or (P) is heated with NaOH solution, a colourless gas (Q) is evolved and on passing this gas through an alkaline solution of potassiumtetraiodidomercurate(II) solution, a reddish brown precipitate is formed.

The hydrocarbon produced on the reaction of the compound (O) with $H_{2} O$ is :

C H_{4}

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C_{2} H_{4}

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C_{3} H_{4}

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C_{2} H_{2}

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Solution

The correct option is D $C_{2} H_{2}$
The unknown compounds are as follows :
(A) $(N H_{4})_{2} C r_{2} O_{7}$
(B) $C r_{2} O_{3}$
(C) $N_{2}$
(M) $C a$
(N) $C a O$
(O) $C a C_{2}$
(P) $N H_{4} N O_{2}$
(Q) $N H_{3}$
Now, the reaction involved is
$C a C_{2} + 2 H_{2} O \to C a (O H)_{2} + C_{2} H_{2}$

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Similar questions

(A) is a colorless solid; it melts when heated and gives off a colorless gas (B) which is a supporter of combustion. If heating is continued, the whole of the solid disappears. When (A) is heated with an aqueous

N a O H

solution, an alkaline gas (C) is evolved. When gas (B) is heated with sodamine, a colorless solid (D) is formed. When (D) is heated with

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

, a colorless liquid (E) is formed.

The compound C has:

Q. On treatment with cold water, an element (A) reacts readily liberating a colourless, odourless gas (B) and a solution (C). Lithium is reacted with (B) yielding a solid product (D) which effervesce with water to give a strongly basic solution (E). When

C O_{2}

gas is bubbled through solution (C), a white ppt. (F) is formed but this redissolved forming solution (G) when more

C O_{2}

is passed. Precipitate (F) effervesced when moistened with conc.

H C l

and give deep red colouration to a Bunsen burner flame. (F) on heating with excess of carbon at

2000^{\circ} C

give (H).
Answer the following-questions on the basis of above passage

1. Metal (A) may be

Q. On treatment with cold water, an element (A) reacts readily liberating a colorless, odourless gas (B) and a solution (C). Lithium is reacted with (B) yielding a solid product (D) which effervescence with water to give a strongly basic solution (E). When

C O_{2}

gas is bubbled through the solution (C), a white ppt (F) is formed but this redissolved forming solution (G) when more

C O_{2}

is passed. The precipitate (F) effervesced when moistened with conc.

H C l

and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at

2000^{o} C

give (H).
Solid (H) on hydrolysis gives a gas, which on passing through ammonical

A g N O_{3}

solution, yields:

Q. The gas liberated on heating a mixture of two salts with

N a O H

, give a reddish brown precipitate with an alkaline solution of

K_{2} H g l_{4}

. The aqueous solution of the mixture on treatment with

B a C l_{2}

gives a white precipitate which is sparingly soluble in concentrated

H C l

. On heating the mixture with

K_{2} C r_{2} O_{7}

and concentrated

H_{2} S O_{4}

, 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. On mixing the aqueous solutions of compounds

(A)

and

(B)

, an insoluble compound

(C)

is produced along with another water soluble compound

(D)

. Compound

(A)

on heating gives brown

N O_{2}

gas with a cracking noise. An aqueous solution of compound

(A)

gives black ppt. with

H_{2} S

gas. Compound

(A)

also gives white ppt. with dil.

H C l

which is soluble in hot water and reappears on cooling. The hot water extract of compound

(A)

gives yellow ppt. with

K_{2} C r O_{4}

solution.

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The correct option is D C2H2The unknown compounds are as follows :(A) (NH4)2Cr2O7(B) Cr2O3(C) N2(M) Ca(N) CaO(O) CaC2(P) NH4NO2(Q) NH3Now, the reaction involved isCaC2+2H2O→Ca(OH)2+C2H2