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Uses of Calcium Carbonate

On treatment ...

Question

On treatment with cold water, an element (A) reacts readily liberating a colorless, odorless 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).
Solution (G) contains a salt which:
(i) causes permanent hardness of water(ii) can not be obtained in solid-state
(iii) causes temporary hardness of water
(iv) can be obtained in solid-state
Identify the salt with correct options.

(i) and (ii)

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(i) and (iv)

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(ii) and (iii)

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(ii) and (iv)

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Solution

The correct option is D (ii) and (iii)
The metal A is calcium. It reacts with cold water to form calcium hydroxide (C) and hydrogen gas (B) which is colourless and odourless.
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2}$
Lithium reacts with hydrogen gas (B) to form a solid product LiH (D).
$2 L i + H_{2} \to 2 L i H$
olid product LiH (D) effervescence with water to give a strongly basic solution (E).
$L i H + H_{2} O \to L i O H + H_{2}$
When $C O_{2}$ gas is bubbled through calcium hydroxide solution (C) , a white ppt of calcium carbonate (F) is formed but this redissolved forming calcium bicarbonate (G) when more $C O_{2}$ is passed.

$C a (O H)_{2} + C O_{2} \to C a C O_{3} \to + H_{2} O$

$C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}$
The precipitate (F) (calcium carbonate) effervesced when moistened with concentrated HCl and give deep red colouration to the Bunsen burner flame
$C a C O_{3} + 2 H C l \to C a C l_{2} + H_{2} O + C O_{2}$
The deep red colour is the characteristic colour of calcium.
Calcium carbonate (F) on heating with excess of carbon at $2000^{o} C$ give calcium carbide (H).
$C a C O_{3} + 3 C 2000^{0} C - --- \to C a C_{2} + C O + C O_{2}$

It is $C a H C O_{3}$ which cannot be obtained in solid-state and causes temporary hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate.

Hence Option-C is correct

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Similar questions

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

2. Solution (G) contains a salt which •
(i) causes permanent hardness of water
(ii) can not be obtained in solid state
(iii) causes temporary hardness of water (iv) can be obtained in solid state Select
the correct statements :

Q. On treatment with cold water, an element (A) reacts readily liberating a colorless, odorless 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).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:

A colorless solid (A) when placed into water produces a heavy white turbidity to (B). Solid (A) gives a clear solution in

c o n c . H C l

when

H C l

solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When

H_{2} S

is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide

(N H_{4})_{2} S

C o n c . H_{2} S O_{4}

added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in

H N O_{3}

(1:1) to give a solution to which

H_{2} S O_{4}

is added followed by addition of

N H_{4} O H

when a white precipitate (F) is formed. (E) gives a black ppt. (G) with solution of sodium stannite.

When compound (A) reacts with

N H_{4} O H

, then product is a:

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 :

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