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Question
Chemistry
Sodium thiosulphate (Na2S2O3. 5H2O) is used in photography to
Q. Sodium thiosulphate
(
N
a
2
S
2
O
3
.5
H
2
O
)
is used in photography to
1563
278
The s-Block Elements
Report Error
A
Reduce silver bromide to metallic silver
20%
B
Convert metallic silver to silver salt
7%
C
Remove undecomposed AgBr as a soluble silver thiosulphate complex
60%
D
Remove unreduced silver
13%
Solution:
A
g
B
r
+
2
N
a
2
S
O
3
→
N
a
3
[
A
g
(
S
2
O
3
)
3
]
+
N
a
B
r