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Componds (A) and B are treated with dilu...

Componds `(A)` and `B` are treated with dilute `HCl` separately. The gases liberated are `Y` and `Z` respectively. `Y` turns acidified `K_2 Cr_2 O_7` paper green while `Z` turns lead acetate paper black. The compounds `A` and `B` are respectively :

A

`NaCl and Na_(2)CO_(3)`

B

`Na_(2)S and Na_(2)S`

C

`Na_(2)S and Na_(2)SO_(3)`

D

`Na_(2)SPO_(3) and Na_(2)SO_(4)`

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The correct Answer is:
B
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