History of concept of Atoms

Q.

Give two drawbacks of Dalton’s atomic theory.

Q. Mass of an electron is about _____ times the relative mass of hydrogen atom.

1. $\frac{1}{1840}$
2. $\frac{1}{12}$
3. $\frac{1}{100}$
4. $\frac{1}{1240}$

Q.

What led to the failure of Daltons atomic theory?

Q.

According to the Thomson's Plum Pudding Model of an atom, the structure of an atom is similar to a chocolate chip cookie where the electrons can be represented as the chocolate chips and the positive charge as dispersed in the rest of the cookie.

1. False

2. True

Q. The chemical symbol for hydrogen atom is:

1. $\text{He}$
2. $\text{H}$
3. ${\text{H}}_2$
4. $\text{Hg}$

Q. Identify the names of the scientists who proposed a model of an atom.

1. Maharishi Kanada
2. J.J. Thomson
3. Niels Bohr
4. John Dalton

Q.

Give one achievement and one limitation of J.J Thomsons model of atom?

Q. Mass of an electron = ______$\times$ Relative mass of Hydrogen

Q. Explain the drawbacks of Dalton's Atomic theory? What did JJ Thompson do to change Dalton's claim? [5 MARKS]

Q. "If matter is broken up, smaller and smaller particles of the same are obtained and a stage will be reached where it cannot be further broken up". Who proposed this theory?

1. John Dalton
2. Democritus
3. Maharishi Kanada
4. Antoine Lavoisier

Q. Which of the following is/are true regarding hydrogen?

1. Its mass number is 2 and atomic number is 1
2. It is also known as inflammable air
3. It is the smallest and simplest known element
4. It has only one neutron and one proton

Q. What is the count of main postulates given by the Dalton?

1. 2
2. 5
3. 4
4. 3

Q. ______ is the lightest and simplest known atom.

1. Helium
2. Carbon
3. Hydrogen
4. Oxygen

Q.

oxygen is a diatomic or monoatomic

Q.

Which of the following are considered as the fundamental building blocks of matter?

1. Compounds

2. Atoms

3. Molecules

4. Elements

Q.

Assertion: A future 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 is wrong, but the reason is correct

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

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

4. Assertion and reason both are wrong

Q.

Assertion: A future discovery of subatomic particles led to the failure of Dalton’s atomic theory.

Reason: An atom is made up of electrons, protons and neutrons

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

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

3. Assertion and reason both are wrong

4. Assertion is wrong, but the reason is correct