Question

The chemicals used as a fixer in phosphorous is  
A.  borax 
B.  sodium thiosulpahte 
C.  sodium sulphate 
D.  ammonium persulphate
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Answer 1

$\huge{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

YOUR ANSWER IS OPTION B. SODIUM THIOSULPHATE

Answer 2

The chemical used as a fixer in phosphorous is sodium thiosulphate.

Thus, option (B) is right.