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Solution


Q.

Select the correct statements from the following:

A.  Atoms of all elements are composed of two fundamental particles.
B.  The mass of electron is 9.10939×10-31 kg.
C.  All the isotopes of a given element show same chemical properties.
D.  Protons and electrons are collectively known as nucleons.
E.  Dalton’s atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below:                                              [2023]
1 A and E only  
2 B, C and E only  
3 A, B and C only  
4 C, D and E only  

Ans.

(2)

Atoms of all elements are composed of three fundamental particles: electrons, protons and neutrons.
Protons and neutrons are collectively known as nucleons.
Hence, B, C and E are correct statements.