engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) General Science Chemistry Electrochemistry

निम्नलिखित में से कौन रासायनिक अभिक्रिया से गुजर सकता है?

1
MgSO4 + Fe
2
ZnSO4 + Fe
3
MgSO4 + Pb 
4
CuSO4 + Fe
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