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Q45 (NDA-I/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry Answer Verified

Solder is an alloy of

Result
Your answer: —  Â·  Correct: C
Explanation

Solder is a metallic alloy primarily composed of lead (Pb) and tin (Sn) [2]. It is characterized by a low melting point, which makes it ideal for welding electrical wires and joining metal workpieces [1]. Common formulations include the 60/40 ratio, consisting of 60% tin and 40% lead [2]. While modern regulations like the RoHS directive have encouraged the development of lead-free alternatives using elements such as silver (Ag), copper (Cu), or zinc (Zn), the traditional and most widely recognized composition of solder remains the lead-tin (Pb-Sn) alloy. Other alloys mentioned in the options, such as copper and tin, form bronze, while copper and zinc form brass [2]. Solder's specific properties, such as its solidus and liquidus temperatures, are tailored by adjusting the proportions of lead and tin to suit various industrial and electronic applications [2].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 3: Metals and Non-metals > QUESTIONS > p. 54
  2. [2] https://en.wikipedia.org/wiki/Solder_alloys
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