The incorrect statement is :
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- bronze is an alloy of copper and tin
- cast iron is used to manufacture wrought iron
- german silver is an alloy of zinc, copper and nickel
- brass is an alloy of copper and nickel
The Correct Option is D
Solution and Explanation
(1) Bronze = Cu + Sn. Correct.
(2) Cast iron is purified and decarburised to get wrought iron. Correct.
(3) German silver = Cu + Zn + Ni (it contains no silver). Correct.
(4) Brass = Cu + Zn, not Cu + Ni. Incorrect.
Answer: (4) brass is an alloy of copper and nickel
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