The soldering iron is heated in a gas
flame until
The bit is the red hot
The coating of borax on the bit turns
black
The gas flame appears orange in the
colour
The gas flame appears green in the
colour
The bit is the red hot
In process of gas soldering, the
soldering iron is heated in a gas flame until the bit is red hot. Such
soldering process does not need electricity.
Hence, the correct option is (A).
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