
According to Dalton's atomic theory, atoms of different elements are different in all respects. Does this statement hold good for all elements? Justify your answer.
Important Questions on Some Basic Concepts of Chemistry

Electrons in a cathode ray tube have been emitted with a velocity of . The number of following statements which is/are true about the emitted radiation is
Given :
(A ) The deBroglie wavelength of the electron emitted is
(B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.
(C) The cathode rays start from cathode and move towards anode.
(D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..


Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Loss of electron from hydrogen atom results in nucleus of size.
Reason R: Proton always exists in combined form.
In the light of the above statements, choose the most appropriate answer from the options given below:

















