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Standard X
Chemistry
pH of Salts
Colourless sa...
Question

Colourless salt (A)Δ→(B)+(C) gas

(B) dissolves both in acid and alkali solution. Gas (C) turns lime water milky and acidified K2Cr2O7 solution green. Ammoniacal solution of (A) gives white ppt (D) with H2S gas. What is (A)?

A
ZnSO3
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B
ZnO
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C
ZnSO4
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D
ZnS
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Solution

The correct option is A ZnSO3
Option A is correct.
ZnSO3[A]Δ→ZnO[B]+SO2
ZnO dissolves both in acid and alkali solution. This indicates its amphoteric nature.
ZnO+2HCl→ZnCl2+H2O
ZnO+2NaOH→Na2ZnO2+H2O
SO2 gas also turns lime water milky and acidified K2Cr2O7 solution green. Ammoniacal solution of (A) gives white ppt (D) with H2S gas.
ZnSO3+NH4OH⟶Zn(OH)2[C]+NH4SO4
Zn(OH)2+H2S⟶ZnS[D]+H2O

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Q. Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing H2S gas into (C) white ppt (D) appears. (A) also gives white ppt (E) with AgNO3 solution. What is (A)?
Q. Sodium salt (A) of a dibasic acid HCl⟶gas(B)
Clear solution of gas (B) turns K2Cr2O7 to green and also lime water milky. Identify (A) and (B).

Q. A salt on reaction with dil. H2SO4 produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be:
Q. Read the following statements:
(i) A white amorphous powder (A) on strongly heating gives a colourless non-combustile gas (B) and solid (C).
(ii) The gas (B) turns lime water milky and turbidity disappear with the passage of excess of gas.
(iii) The solution (C) in dilute HCl gives a white precipitate with an aqueous solution of K4[Fe(CN)6].
(iv) The solution of (A) gives a white precipitate (D) on pasiing H2S in presence of excess of NH4OH.
Compound (A) to (D) are identified as:
(A) : ZnCO3 (B) : CO2, and (C) : ZnO, and (D) : ZnS
If true enter 1, else enter 0.
Q. A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of NH4OH and on passing H2S. Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (D) are identified as:
(A) : ZnCO3, (B) : CO2, (C) : ZnO, (D) : ZnS and (E) : Zn(OH)2
If true enter 1, else enter 0.
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