NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension: Questions 212 - 216 of 828
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Question number: 212
Question number: 213
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 substances Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorize colored fabrics. The compounds X, Y and Z respectively are