A constituent common to bronze and solder is?

Analyze the question: We need the metal that appears in both bronze and solder.

Explain the concept: Alloys are mixtures of metals (or a metal and a non-metal) designed to have useful properties.

Show the solution: Let's look at the composition of each alloy.

• Bronze: mainly copper and tin
• Solder: commonly tin and lead (traditional soft solder is about 50-60% tin, 40-50% lead)

Now compare each option:

• A. Lead: in solder, but not in bronze ✗
• B. Silver: not a standard constituent of either (only in some special solders) ✗
• C. Copper: in bronze, but not in ordinary solder ✗
• D. Tin: in bronze and in solder ✓

Answer: The common constituent is tin, which is option D.

Tip: Memorize the key alloys in groups:

• Bronze = Copper + Tin
• Brass = Copper + Zinc
• Solder = Tin + Lead

Tin is the link between bronze and solder. Ask yourself, "Which metal appears in both lists?" and the answer is tin.