Which one among the following is not a correct statement ?

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Q: 21 (CDS-II/2013)
Which one among the following is not a correct statement ?
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question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,20,26,8,11,7,20

keywords: 

{'cathode rays': [0, 0, 0, 3], 'electrons': [0, 0, 0, 5], 'proton': [0, 0, 1, 2], 'particles': [1, 0, 5, 16], 'atoms': [0, 0, 0, 2], 'hydrogen ions': [0, 0, 1, 1], 'basic constituents': [0, 0, 0, 1], 'gases': [0, 0, 5, 12], 'correct statement': [0, 0, 5, 6]}