Atoms

Q. Which of the following elements has its symbol given in the correct format?

1. Aluminium - Al
2. Zinc - ZN
3. Fluorine - f
4. Boron - B

Q.

Which scientist among the following said that all matter is composed of small particles called atoms?

1. Mendeleev

2. Avogadro

3. Dalton

4. Rutherford

Q. What are the limitations of J.J. Thomson’s model of the atom?

Q. A/An______ is the smallest particle of a substance which can take part in a chemical reaction.

1. atom
2. molecule
3. both A and B
4. none of the above

Q. How many protons, neutrons and electrons are present in a carbon-12 atom?

1. 6 electrons, 6 protons, 6 neutrons
2. 6 electrons, 6 protons, 12 neutrons
3. 6 electrons, 12 protons, 6 neutrons
4. 6 electrons, 12 protons, 12 neutrons

Q. The chemical symbol of sodium and mercury is ______ and ______ respectively

1. N, Mg
2. Na, Hg
3. Na, Mg
4. N, Hg

Q. what are the two main parts of which an atom is made of ?

Q. Which of the following is an element?

1. Copper
2. Sugar
3. Water
4. Salt

Q.

Question 1.

Write the basic difference in physical properties of the three states of matter.

Q.

Which of the following statements is/are incorrect?

1. An atom is the smallest particle which has the same properties as of its element.

2. The subatomic particles for different atoms are the same.

3. A molecule is the smallest particle which has the same properties as of its compound.

4. A molecule of a compound remains unchanged in a chemical reaction.

Q. The chemical symbol for sodium is____________

1. Sd
2. Na

3. So

Q.

When do we make use of Roman numerals to indicate the charge of the cation?

1. Shock notation

2. Stoke notation

3. Trial notation

4. Stock notation

Q. In the given diagrams, the circular rings around the nucleus represents:

1. 
2. 
3. 
4. 

Q. Law of constant proportion states that a chemical compound always contains the same elements combined in a fixed proportion by mass.

1. True
2. False

Q. Write the names of the elements from the following symbols: ​

Zn, Br, Fe, Si, Pt

Q. Light energy is obtained in fluorescent lamp and in CFL as a result of electron emission. Yet, the process of electron emission is different in both cases. What is the difference?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> List down the postulates of Dalton's atomic theory.

Q.

Question 3

What is the interparticle force of attraction?

Q. Who is Max Planck?