EASY
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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

EASY
Amongst the following statements, that which was not proposed by Dalton was :
MEDIUM

Electrons in a cathode ray tube have been emitted with a velocity of 1000 ms-1. The number of following statements which is/are true about the emitted radiation is

Given : h=6×10-34Js,me=9×10-31 kg

(A ) The deBroglie wavelength of the electron emitted is 666.67 nm

(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..

EASY
The number of times the comparative mass of a neutron is heavier than an electron is:
HARD

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 ~1.5×103 pm size.

Reason R: Proton H+ always exists in combined form.

In the light of the above statements, choose the most appropriate answer from the options given below:

MEDIUM
Among the following, the correct statement about cathode ray discharge tube is

 
MEDIUM
How could Dalton's atomic theory explain the laws of chemical combination?
MEDIUM
What are the limitations of Dalton's atomic theory?
EASY
Does an atom have any internal structure or is it indivisible ?
MEDIUM
What are the limitations of Dalton's atomic theory?
MEDIUM
Which of the following statements was not proposed by Dalton's atomic theory?
MEDIUM
Identify the statement which is false regarding the postulates of Dalton's atomic theory.
EASY
Which among the following is not a basic postulate of Dalton's atomic theory?
MEDIUM
Give four important postulates of Dalton's atomic theory.
EASY
A chemical reaction involves the participation of which smallest matter?
MEDIUM
State the postulates of Dalton's atomic theory.
MEDIUM
Write the limitations of Dalton's atomic theory.
MEDIUM
Dalton's atomic theory could explain the laws of 
EASY
Which of the following is not correct according to Dalton's atomic theory?