Question

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`

Answer 1

Correct Answer - A
`Na_2SO_3` gives `SO_2` which turns acidified dichromate paper green. `Na_2S` gives `H_2S` which turns lead acetate paper black.