Dalton's Atomic Model

Q.

Which of the following scientist observed that cathode rays consist of negatively charged particles?

1. John Dalton

2. J.J.Thomson

3. E. Goldstein

4. James Chadwick

Q.

What was the postulate of Daltons atomic theory about the divisibility of atom? How was this postulate modified?

Q. Which of the following is/are the incorrect postulate(s) of the Dalton's atomic theory? ​
I) An atom is the smallest particle and is indivisible. ​
II) Atoms of all elements are identical. ​
III) Atoms can neither be created nor be destroyed.​

1. Only I​
2. Only II​
3. Only III​
4. II and IIII​

Q. John Dalton stated that atoms are indivisible.

1. False
2. True

Q.

What is particle theory?

Q. Assertion: The discovery of sub-atomic particles led to the failure of Dalton’s atomic theory.
Reason: An atom is made up of protons, neutrons and electrons.

1. Assertion and reason are correct, but Reason is not the correct explanation

2. Assertion is wrong, but the reason is correct

3. Assertion and reason are correct, and Reason is the correct explanation

4. Assertion and reason both are wrong

Q. Which of the following is not a postulate of Dalton's atomic theory?

1. Atoms are not created or destroyed in chemical change.
2. Different elements have atoms of different masses.
3. Atoms combine in simple whole number ratios to form compounds.
4. Atoms of a single element can have different masses.