Chemistry Exam  >  Chemistry Tests  >  Physical Chemistry  >  Test: Bohr's Model of Hydrogen Atom - Chemistry MCQ

Test: Bohr's Model of Hydrogen Atom - Chemistry MCQ


Test Description

10 Questions MCQ Test Physical Chemistry - Test: Bohr's Model of Hydrogen Atom

Test: Bohr's Model of Hydrogen Atom for Chemistry 2024 is part of Physical Chemistry preparation. The Test: Bohr's Model of Hydrogen Atom questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Bohr's Model of Hydrogen Atom MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Bohr's Model of Hydrogen Atom below.
Solutions of Test: Bohr's Model of Hydrogen Atom questions in English are available as part of our Physical Chemistry for Chemistry & Test: Bohr's Model of Hydrogen Atom solutions in Hindi for Physical Chemistry course. Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free. Attempt Test: Bohr's Model of Hydrogen Atom | 10 questions in 30 minutes | Mock test for Chemistry preparation | Free important questions MCQ to study Physical Chemistry for Chemistry Exam | Download free PDF with solutions
Test: Bohr's Model of Hydrogen Atom - Question 1

The energy of 1st orbit in a hydrogen atom __________

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 1

The energy of an nth orbit in a hydrogen atom is given by the formula En = -RH/n2, where is the energy of nth orbit and RH is the Rydberg constant. The energy of 1st orbit in a hydrogen atom = -2.18 x 10-18 J/1 = -2.18 x 10-18 J.

Test: Bohr's Model of Hydrogen Atom - Question 2

What’s the radius of 1st orbit of He+ atom?

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 2

The atomic radius of an atom is given by the formula rn = 52.9n2/Z pm, where rn is the radius of nth orbit of an atom and Z is the atomic number of that atom. For He+, n = 1 and Z =2. Radius = 52.9(1)/2 pm = 0.02645 nm.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Bohr's Model of Hydrogen Atom - Question 3

Bohr’s model could not explain the ability of atoms to form molecules by ______

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 3

Though Bohr’s postulates could explain angular momentum, radius, and energy of an orbit, line spectrum of the hydrogen atom, it also had some drawbacks. Among the drawbacks not able to explain the ability of atoms to form molecules by chemical bonds is also one.

Test: Bohr's Model of Hydrogen Atom - Question 4

The energy of a hydrogen atom is positive.

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 4

The energy of a hydrogen atom is negative. It means the energy of a hydrogen atom is then that lower than that of a free electron that is at rest. This means the hydrogen atom has negative electronic energy.

Test: Bohr's Model of Hydrogen Atom - Question 5

Iω = _________

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 5

We know that linear momentum is given by mv and that angular momentum in Iω; m = mass, v = velocity, r = radius, I = inertia of momentum and w = angular velocity. I =mer2 and ω = v/r and Iω = mer2v/r = mevr.

Test: Bohr's Model of Hydrogen Atom - Question 6

Angular momentum of an electron is quantized.

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 6

According to Bohr’s postulate, angular momentum is quantized and this is given by the expression mevr = nh/2π. (n =1, 2, 3….). mevr is the angular momentum and h is the Planck’s constant. Movement of an electron can only be possible in orbits whose angular momentum is the integral multiple of h/2π

Test: Bohr's Model of Hydrogen Atom - Question 7

What is the ratio of the atomic radius of the 5th orbit in chlorine atom and 3rd orbit in Helium atom?

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 7

The atomic radius of an atom is given by the formula rn = 52.9n2/Z pm, where rn is the radius of nth orbit of an atom and Z is the atomic number of that atom. The ratio of the atomic radius of the 5th orbit in chlorine atom and 3rd orbit in Helium atom is 25/17 : 9/2 = 50 : 153.

Test: Bohr's Model of Hydrogen Atom - Question 8

Bohr’s model couldn’t explain Zeeman and stark effect.

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 8

Yes, it’s a limitation of Bohr’s model that it could not the splitting of spectral lines in the magnetic field that is Zeeman effect and also in the electric field also known as a stark effect. so the above statement is true.

Test: Bohr's Model of Hydrogen Atom - Question 9

Calculate the wavelength of a photon that traveled from 5th orbit to 2nd orbit.

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 9

The energy of an nth orbit in a hydrogen atom is given by the formula En = -RH/n2, where is the energy of nth orbit and RH is the Rydberg constant. E5 – E2 = -4.58 x 10-19J. λ(wavelength) = c(speed of light)h(Planck’s constant)/E = 434nm.

Test: Bohr's Model of Hydrogen Atom - Question 10

Which of the following is the value for Rydberg constant?

Detailed Solution for Test: Bohr's Model of Hydrogen Atom - Question 10

The energy of an nth orbit in a hydrogen atom is given by the formula En = -RH/n2, where is the energy of nth orbit and RH is the Rydberg constant. When experiments were conducted, the product of the energy of nth orbit to the square of n is constant i.e. Rydberg constant.

83 videos|142 docs|67 tests
Information about Test: Bohr's Model of Hydrogen Atom Page
In this test you can find the Exam questions for Test: Bohr's Model of Hydrogen Atom solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Bohr's Model of Hydrogen Atom, EduRev gives you an ample number of Online tests for practice
83 videos|142 docs|67 tests
Download as PDF