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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

`Na_2SO_3, Na_2S`

B

`NaCl, Na_2CO_3`

C

`Na_2S, Na_2SO_3`

D

`Na_2SO_3. K_2SO_4`

Text Solution

Verified by Experts

The correct Answer is:
A
`Na_2SO_3` gives `SO_2` which turns acidified dichromate paper green. `Na_2S` gives `H_2S` which turns lead acetate paper black.
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