Dalton's Atomic Theory

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

1. Atoms are composed of negatively charged electrons revolving around an oppositely charged cloud
2. Atoms can neither be created nor be destroyed
3. Atoms of different elements have different atomic weights
4. There are many kinds of atoms as there are elements

Q.

Name the building block of all matter.

Q.

Which of the following postulates of Daltons atomic theory was proved Wrong with the discovery of radioactivity?

1. Matter is constituted of the tiniest particles called atoms.

2. Atoms are indivisible.

3. Atoms of same elements are identical in all aspects.

4. Atoms of different elements are different in all aspects.

Q. Which of the following are the postulates of Dalton's atomic theory?

1. Atoms cannot be subdivided, created or destroyed.
2. Atoms of same element are similar in shape and mass.
3. Elements are made of extremely small particles called atoms.
4. Atoms contain mostly empty space.

Q.

__________ model of atom proposed that electrons are embedded in a positive sphere

Q.

Which of the following is/are not a characteristic of atom suggested by John Dalton?

i. An atom is the smallest particle which cannot be divided further into smaller particles.

ii. Atoms of all the different elements are identical.

iii. Atoms can neither be created nor be destroyed.

iv. Atoms take part in Chemical Reaction.

1. (ii)

2. (ii) and (iv)

3. (i) and (ii)

4. (iii)

Q.

A sample of radioactive material has mass $m$, decay constant $\lambda$ , and molecular mass $M$. If NA​ is Avogadros number, the initial activity of the sample is:

Q.

Dalton stated that “atoms are indivisible”.

1. True

2. False

Q. Dalton's atomic theory says that atoms are indivisible. Is this statement still valid? Give reasons for your answer.

Q. Assertion :The concepts of atom was firstly used by Dalton. Reason: Atom is the smallest particle of matter that takes part in a chemical reaction. Atom is also defined as the smallest particle of an element that retains all the properties of an element.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. A mole is the quantity of a substance that contains the same number of particles as present in 12g of Carbon.

1. True
2. False

Q. One of the statements of Dalton's atomic theory is given below "compounds are formed when atoms of different elements combine in a fixed ratio. " Which law of chemical combination is not related to this statement?

1. Law of conservation of mass
2. Law of multiple proportion
3. Avogadro's law
4. Law of definite proportion

Q. What are the postulates of Dalton's atomic theory .

Q.

Complete the following sentence.
An ______ is the smallest particle of an element that can take part in a chemical reaction.

Q.

Dalton’s atomic theory says the atom is indivisible. Is this statement still valid? Give a reason for your answer.

Q.

Match the following scientist in column A with their discoveries or contribution in column B

Column 1	Column 2
Marie curie	Safety Lamp
John Dalton	Helium
William Ramsey	Nobel Prize winner (two times)
Sir Humphry Davy	Atomic Theory

Q. Write True or false:

1. True
2. False

Q.

What are the features of Dalton’s atomic theory?

1. Explains the laws of chemical combination

2. Distinguishes between atoms and molecules

3. Explains the laws of chemical combination and distinguishes between atoms and molecules

4. Discovered that electrons are embedded in the positively charged sphere

Q.

what is avagadros number? and what is mole ? what is S.T.P?

Q.

Dalton stated that “atoms are indivisible”. Was he right?

1. True

2. False

Q. Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

1. Atoms of a given element are identical in mass and chemical properties
2. All matter is made of very tiny particles called atoms
3. Atoms of different elements have different masses and chemical properties
4. Atoms are indivisible particles and cannot be created nor destroyed

Q. The existence of isotopes violated which one of the postulates of Dalton's atomic theory?

1. All matter is made of very tiny particles called atoms
2. Atoms are indivisible particles and cannot be created nor destroyed
3. Atoms of a given element are identical in mass and chemical properties
4. Atoms of same elements are alike in all respects

Q.

who is john dalton and what are his achievements?

Q. Write true or false .
a)Nucleus of an atom contains nucleons only was proposed by
J.J Thomson
b) Neutron is sum of electron and proton , there fore it is neutral .

Q. According to Dalton, what are the smallest particles of matter?

1. Molecules
2. Ions
3. Atoms
4. None of the above

Q.

Discoveries of isotopes and isobars contradict some of the postulates of ______ atomic theory.

1. Bohrs

2. Daltons

3. Rutherfords

4. Thomsons

Q.

Give some examples of quanta and explain how they work.

Q. When did John Dalton discovered the symbol of different element?

Q. Which postulates of Dalton's atomic theory can explain the Law of definite proportion?

1. All matter is made of very tiny particles called atoms.
2. Atoms of a given element are identical in mass and chemical properties.
3. Atoms are indivisible particles and cannot be created nor destroyed.
4. The relative number and kind of atoms in a given compound remain constant.

Q.

According to Dalton atomic theory, atoms are divisible particles and can be created in a chemical reaction?

1. True

2. False