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Permanent Hardness

On treatment ...

Question

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 :

(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 C (ii) and (iii)
It is $C a H C O_{3}$ , which can not be obtained in solid state and causes temporary hardness.

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Similar questions

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

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:

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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The correct option is C (ii) and (iii)It is CaHCO3, which can not be obtained in solid state and causes temporary hardness.

The correct option is C (ii) and (iii)
It is $C a H C O_{3}$ , which can not be obtained in solid state and causes temporary hardness.