state gov Allahabad High Court RO/ARO Mock Test 2025 General Science Chemistry Periodic Table

तांब्याच्या जर्मन सिल्व्हर धातूमिश्रणामध्ये ________ आहे.

1
Cu, Zn, Ag
2
Cu, Zn, Ni
3
Cu, Ni, Ag
4
Cu, Zn, Al
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