Introduction to Atomic Structure

Q. 28. The circumference of second orbit of H-atom, if thewavelength of electron is 5 x 10 m

Q. Spin multiplicity of any element having paired electron is 1 or 0?

Q. number of moles in 2 kg of electrons is

Q.

When an electron is added to neutral gaseous atom to convert it into a negative ion, the enthalpy change accompanying the process is called:

1. Lattice enthalpy

2. Electron gain enthalpy

3. Hydration enthalpy

4. Ionisation enthalpy

Q. The correct value of charge to mass ratio of an electron is:

1. $1.7588\times {10}^{11}$ C/g
2. $1.7588\times {10}^8$ C/g
3. $1.7588\times {10}^8$ C/kg
4. $1.7588\times {10}^9$ C/g

Q. 73 Is it possible that at bridge head position free radical is generate ?

Q.

A statement which is not a part of Dalton's atomic theory is:

1. Matter is made of atoms.

2. All atoms of a given element are identical

3. Atoms of different elements have different mass and different properties

4. Atoms are composed of sub-atomic particles called electron, proton and neutron

Q.

The cyanamide ion $\left(NC{N}^{-2}\right)$ isiso electronic with

1. CN^-1

2. NO₂

3. N₃^-1

4. Ca⁺²

Q.

Thomson's plum pudding model explained:

1. Electrons move in fixed circular orbits

2. Existence of electrons

3. Existence of protons

4. Electrical neutrality of an atom

Q. 1) Do cathode rays originate from cathode itself? 2)Do anode rays originate from anode itself

Q. What is Bohr atomic model?

Q. how to calculate atomic number and mass number

Q. the correct set of quantum number for the unpaired electrons of F atom is

Q. 33.Define Thompsons model of atom

Q. 17. Which of the following species has maximum charge to mass ratio? 1. D^+ 2. H^+ 3. He^+ 4. He^{2+

Q. how many moles of electron weigh 1 kg?

Q. How does Thomson Atomic Model explains about the stability of an atom.

Q. Nitrogen occurs in nature in the form of two isotopes of atomic mass 14 and 15 respectively. If average atomic mass of Nitrogen is 14. What is the% abundance of the two isotopes?

Q.

How does Anode rays and cathode rays originate in cathode ray discharge tube?

Q. A subatomic particle has a -1 relative unit charge and the ratio of charge to mass is $1.758820\times {10}^{11}Ck{g}^{–1}$. Find the absolute mass of the sub-atomic particle in kg.

1. $6.4\times {10}^{-31}kg$
2. $9.1\times {10}^{-31}kg$
3. $9.1\times {10}^{-30}kg$
4. $3.8\times {10}^{-31}kg$

Q. The hottest region of Bunsen flame shown in the figure below is :

1. Region 2
2. Region 3
3. Region 4
4. Region 1

Q. What are the alpha particles?

Q.

The mass of a proton is __________________times that of an electron.

Q. In cathode ray experiment cathode rays contain negatively charged particles , but it should contain positive cations why it is not so ?

Q. Assertion: Chemical reactions involve the rearrangement of atoms.
Reason: Atoms are indestructible and can neither be created nor be destroyed in a chemical reaction.

1. Both the Assertion and the Reason are correct and the reason is the correct explanation of the Assertion
2. The Assertion and the Reason are correct but the reason is not the correct explanation of the Assertion
3. The Assertion is true but the reason is false
4. Both the statements are false

Q. Though evacuated tube is used in cathode ray experiment as well as anode ray experiment then too it is written as evacuated tube is known as cathode ray discharge tube why?

Q. 400 mg of calcium atoms are removed from 0.1 mol of calcium and the remaining amount is allowed to react with oxygen. How many oxygen atoms are involved in the formation of calcium oxide? \lbrack N = 6 x 10 \rbrack

Q. 43.how many moles of electrons weigh one kg?

Q.

why does cathode rays produce x-rays?

Q. Atomicity Avogadro hypothesis ka application kaise hai?