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 ?

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]}

The correct answer is option 4: Hydrogen ions do not contain any proton.

Option 1 states that cathode rays are negatively charged particles, which is correct. Cathode rays were later identified as streams of electrons, which are indeed negatively charged particles.

Option 2 states that cathode rays are produced from all gases, which is also correct. When a high voltage is applied to a gas-filled tube, cathode rays can be observed regardless of the gas used.

Option 3 states that electrons are basic constituents of all atoms, which is true. Electrons are subatomic particles that are found orbiting the nucleus of an atom, and they have a negative charge.

However, option 4 states that hydrogen ions do not contain any protons, which is incorrect. Hydrogen ions are formed when a hydrogen atom loses its electron, resulting in a positively charged ion. These hydrogen ions (H+) contain a single proton in their nucleus.

Therefore, option 4 is the incorrect statement among the given options.