Question

Which of the following chemical reaction(s) is//are involved in developing of photographic plate?
A. `C_(6)H_(4)(OH)_(2)+2AgBr to 2Ag+C_(6)H_(4)O_(2)+2HBr`
B. `AgBr+2Na_(2)S_(2)O_(3) to Na_(3)[Ag(S_(2)O_(3))_(2)]+NaBr`
C. `2AgNO_(3)+Na_(2)S_(2)O_(3) to Ag_(2)S_(2)O_(3)+2NaNO_(3)`
D. `AgNO_(3)+KCN to AgCN+KNO_(3)`

Answer 1

Correct Answer - AB
Used in developing of photography plates . i.e. to reduce `Ag^(+)` to Agl downarrow.
(B) Fixing of photography plates I.e. to remove unreduced `AgBr`.
(C ) & (D) reaction are not involved in photography.