NEET Exam Model Paper 5

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Question : 171 of 180

Marks: +1, -0

Incorrect set among the following is

German silver: 25 – 30% Cu + 25 – 30% Zn + 40 – 50% Ni
Zr or Ti: These metals can be refined by van Arkel method
Slag in the extraction of Cu:CaSiO3
Electrolyte in Hall - Heroult process: Molten Al2O3+Na3AlF6+CaF2

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