In Class 10 Chemistry (Metals and Non-Metals), understanding alloys—mixtures of two or more metals—is an important topic. Solder is one of the most commonly asked examples in board exams.
Due to the severe health risks and environmental toxicity associated with Lead (Pb), modern electronics manufacturing is rapidly shifting to 'Lead-free Solder', which is primarily made of Tin mixed with small amounts of Silver (Ag) and Copper (Cu).
Solder is an alloy composed of two metals:
The main reason for creating the alloy Solder is its low melting point.
Because it melts easily at a relatively low temperature but quickly solidifies into a strong metallic bond, it is perfect for its primary application.
Solder is universally used for welding (joining) electrical wires and electronic components onto Printed Circuit Boards (PCBs). Because its melting point is low, it can melt and join wires without the intense heat destroying the delicate electronic chips nearby.
An amalgam is a special type of alloy in which one of the constituent metals is strictly **Mercury (Hg)**. (e.g., Silver-mercury amalgam was formerly used for dental fillings).
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