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Standard XII
Chemistry
Uses of Calcium Carbonate
On treatment ...
Question

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 CO2 gas is bubbled through the solution (C), a white ppt (F) is formed but this redissolved forming solution (G) when more CO2 is passed. The precipitate (F) effervesced when moistened with conc.HCl and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at 2000oC give (H).
Solid (H) on hydrolysis gives a gas, which on passing through ammonical AgNO3 solution, yields:

A
white ppt
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B
red ppt
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C
no ppt
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D
brown ppt
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Solution

The correct option is B white ppt
The metal A is calcium. It reacts with cold water to form calcium hydroxide (C) and hydrogen gas (B) which is colorless and odorless.
Ca+2H2O→Ca(OH)2+H2
Lithium reacts with hydrogen gas (B) to form a solid product LiH (D).
2Li+H2→2LiH

olid product LiH (D) effervescence with water to give a strongly basic solution (E).
LiH+H2O→LiOH+H2
When CO2 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 CO2 is passed.
Ca(OH)2+CO2→CaCO3→+H2O
CaCO3+H2O+CO2→Ca(HCO3)2
The precipitate (F) (calcium carbonate) effervesced when moistened with concentrated HCl and give deep red coloration to the Bunsen burner flame
CaCO3+2HCl→CaCl2+H2O+CO2
The deep red color is the characteristic color of calcium.
Calcium carbonate (F) on heating with excess of carbon at 2000oC give calcium carbide (H).
CaCO3+3C20000C−−−−→CaC2+CO+CO2
Solid (H, calcium carbide) on hydrolysis gives acetylene, which on passing through ammoniacal silver nitrate solution, yields white precipitate of silver acetylide.
CaC2+2H2O→Ca(OH)2+C2H2↑
C2H2+AgNO3+NH3→C2HAg+NH4NO3

Hence, Option-A is correct.

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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 CO2 gas is bubbled through the solution (C), a white ppt (F) is formed but this redissolved forming solution (G) when more CO2 is passed. The precipitate (F) effervesced when moistened with conc.HCl and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at 2000oC give (H).Metal (A) may be :

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 CO2 gas is bubbled through the solution (C), a white ppt (F) is formed but this redissolved forming solution (G) when more CO2 is passed. The precipitate (F) effervesced when moistened with conc.HCl and give deep red coloration to the Bunsen burner flame. (F) on heating with an excess of carbon at 2000oC 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 CO2 gas is bubbled through solution (C), a white ppt. (F) is formed but this redissolved forming solution (G) when more CO2 is passed. Precipitate (F) effervesced when moistened with conc. HCl and give deep red colouration to a Bunsen burner flame. (F) on heating with excess of carbon at 2000∘ 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.
A colorless solid (A) when placed into water produces a heavy white turbidity to (B). Solid (A) gives a clear solution in conc.HCl when HCl solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When H2S is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide (NH4)2S. Conc.H2SO4 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 HNO3 (1:1) to give a solution to which H2SO4 is added followed by addition of NH4OH when a white precipitate (F) is formed. (E) gives a black ppt. (G) with solution of sodium stannite.

When compound (A) reacts with NH4OH, then product is a:
Q.
A black colored compound (A) on reaction with dil.H2SO4 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 BaCl2 to an aqueous solution of (E), white precipitate insoluble in HNO3 is obtained.

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