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Q.

Which of the following statements about the electron is incorrect?

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a

 It is a negatively charged particles

b

The mass of the electron is equal to the mass of the neutron

c

It is a basic constituent of all atoms

d

It was discovered by J.J. Thomson in 1900

answer is B.

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Detailed Solution

The incorrect statement is - The mass of the electron is equal to the mass of the neutron.

Electrons were discovered by  J.J. Thomson in 1900. It is the basic constituent in all atoms. Electrons are negatively charged. Its mass is equal to 1/2000 of the mass of a proton or neutron. So, 'the mass of the electron is equal to the mass of the neutron' is the incorrect statement.

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