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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).Metal (A) may be :

A

Be

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B

Ca

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C

Sr

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D

Ba

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Solution

The correct option is A Ca
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).
$C a C O_{3} + 3 C 2000^{0} C - --- \to C a C_{2} + C O + C O_{2}$

So, the metal is A is Calcium.

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Similar questions

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. 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.

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 :

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

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:

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 :

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