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0. A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X, Y and Z respectively are(NTSE Stage-II,2014-15)
CaC03, Ca(OH)2 CaOCI2
Ca(OH)2, CaO, CaOCI2
CaC03, CaOCI2, Ca(OH)2
Ca(OH)2 CaC03, CaOCI2
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