(X) -KOH- (Y) (gas turns red litmus blue) + (Z) ; (Z) -Zn + KOH- (Y) (gas) ; (X) -Δ- gas (does not support combustion). Identify (X) to (Z):

Question

(X) -KOH-> (Y) (gas turns red litmus blue) + (Z) ; (Z) -Zn + KOH-> (Y) (gas) ; (X) -Δ-> gas (does not support combustion). Identify (X) to (Z):

Prashant Kotian · Accepted Answer

Correct answer: A. Step 1: Reacting thiosulfate (S2O32-) with dilute mineral acids like HCl leads to protonation and decomposition. Step 2: The reaction yields colloidal sulfur (appearing as a pale yellow precipitate) and sulfur dioxide gas (possessing a pungent, suffocating odor): S2O32- + 2H+ -> S↓ + SO2↑ + H2O. Step 3: This characteristic behavior uniquely identifies the thiosulfate ion, matching option (c).

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