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An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions:

The s-Block Elements

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18/12/2021 12:19 pm

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Palak23

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An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions:

(a) It gives a white turbidity with dilute HCl solution

(b) It decolourises a solution of iodine in potassium iodide

Identify the compound (X)

(a) Na₂CO₃.10H₂O

(b) Na₂S₂O₃.5H₂O

(d) None of these

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18/12/2021 12:30 pm

Reyana09

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Correct answer: (b) It decolourises a solution of iodine in potassium iodide

Explanation:

X = Na₂S₂O₃.5H₂O

Na₂S₂O₃ + 2HCl → 2NaCl + H₂O + S + SO₂

KI₃ + 2Na₂S₂O₃ → KI + 2NaI + Na₂S₄O₆

2AgNO₃ + Na₂S₂O₃ → Ag₂S₂O₃ + 2NaNO₃

Ag₂S₂O₃ + H₂O → Ag₂S + H₂SO₄

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