Discussion
The commonly used flux in brazing is:
Answer: B
The commonly used brazing flux is borax.
Brazing is done at higher temperatures than soldering (above about 450 °C), and borax melts into a glassy layer at those temperatures that dissolves oxides and keeps air off the joint, letting the filler metal wet and flow into it.
Rosin and zinc chloride are soldering fluxes: rosin for electrical work and zinc chloride for general sheet-metal soldering; both work at soldering temperatures, not brazing ones. Lead sulphide is not a flux.
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