A) Duralumin-\[Al+Cu+Mg+Mn\]
B) Ainico-\[Fe+Al+Ni+CO\]
C) German silver -\[Cu+Zn+Ni\]
D) Monel metal-\[Cu+Zn+Sn\]
Correct Answer: D
Solution :
(i) Duralumin is \[Al+Cu+Mg+Mn\]. It is used for construction of aeroplanes. (ii) Ainico is \[Al+Ni+Co+Fe\]. It is used for making permanent magnets. (iii) German silver is \[Cu+Zn+Ni\]. It is used for making artificial ornaments. (iv) Monel metal is \[Cu+Ni\]. It is used for making plant and equipment for chemical industry.
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