Verified Solution • 2025–26 Session
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QJEEM20Ch3195: JEE Main 2020 Chemistry - Class 12 JEEM20Ch3195 Solution: The incorrect statement is :
The incorrect statement is :
Multiple Choice Options
- A bronze is an alloy of copper and tin
- B cast iron is used to manufacture wrought iron
- C german silver is an alloy of zinc, copper and nickel
- D brass is an alloy of copper and nickel
Step-by-Step Verified Solution
Bronze contains 75 – 90% Cu and 10 – 25% Sn Cast iron is used to make wraugut iron.
German silver contains 56% Cu, 24% Zn and 20% Ni.
Brass contains 60% Cu and 40% Zn.
Note :
German silver contains 56% Cu, 24% Zn and 20% Ni.
Brass contains 60% Cu and 40% Zn.
Note :
| Alloys | Composition |
|---|---|
| Brass | 60% Cu + 40% Zn |
| Bronze | 75-90% Cu + 10-25% Sn |
| Gun-metal | 90% Cu + 8% Sn + 2% Zn |
| Aluminium bronze | 90% Cu + 10% Al |
| Monel metal | 30% Cu + 67% Ni + 3% (Fe + Mn) |
| German Silver | 56% Cu + 24% Zn + 20% Ni |
| Manganin | 78-86% Cu + 13-18% Mn + 1-4% Ni |
| Bell metal | 80% Cu + 20% Sn |
| Constantan | 60% Cu + 40% Ni |