An alloy of Pb and Sn in equal proportion is called
solder
B
Since Type metal is an alloy of Tin (Sn), Antimony (Sb), and Lead (Pb), the given option is incorrect.
C
Since Constantan is an alloy of Copper (Cu) and Nickel (Ni), the given option is incorrect.
D
Since Gun metal is an alloy of Copper (Cu) and Tin (Sn), the given option is incorrect.