Which one of the following represents the correct order of electron releasing tendency of metals?

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Q: (NDA-II/2019)

Which one of the following represents the correct order of electron releasing tendency of metals?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,4,4,4,3,0,1

keywords: 

{'metals': [1, 2, 2, 7], 'electron': [0, 0, 0, 2], 'correct order': [0, 0, 2, 0], 'zn': [0, 0, 1, 5], 'ag': [0, 0, 1, 2], 'cu': [0, 0, 2, 5], 'tendency': [0, 1, 1, 1]}