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(X) + H2O → HNO2 + HNO3
(W) + HNO3→ Y + NO + H2O
(Y) + Na2S2O3 (excess) → (Z) + NaNO3
Identify (W) to (Z):
  1. W = Ag, X = N2O, Y = AgNO3, Z = Na2[Ag(S2O3)2]
  2. W = Ag2O, X = NO, Y=AgNO3, Z = Na3[Ag(S2O3)2]
  3. W = Ag, X = NO2, Y=AgNO3, Z = Na3[Ag(S2O3)2]
  4. W = Ag2O, X = N2, Y=AgNO3, Z = Na[Ag(S2O3)2]
Solution (C)
AgNO3 Description: 49565.png
Description: 49572.png
Description: 49581.png
AgNO3 + 2Na2S2O3 → Na3[Ag(S2O3)2] + NaNO3


A compound X on heating gives a colorless gas. The residue is dissolved in water to obtain Y. Excess CO2 is passed through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The compound X is:
  1. NaHCO3
  2. Na2CO3
  3. Ca(HCO3)2
  4. CaCO3
Solution (D)
Description: 49590.png
Description: 49597.png
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