Addition of dilute hydrochloride acid to an aqueous solution of a crystalline salt yield a…

Chemistry JAMB 1985

Addition of dilute hydrochloride acid to an aqueous solution of a crystalline salt yield a yellow precipitate and a gas which turned dichromate paper green. The crystalline salt was probably?

  • Na2SO4
  • Na2S
  • Na2S2O3.5H2O checkmark
  • Na2CO3
  • NaHCO3

The correct answer is: C

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