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

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?

A. Na2SO4
B. Na2S
C. Na2S2O3.5H2O
D. Na2CO3
E. NaHCO3




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