Test: Bohr's Model of Hydrogen Atom

# Test: Bohr's Model of Hydrogen Atom

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

Test: Bohr's Model of Hydrogen Atom for Chemistry 2023 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 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Bohr's Model of Hydrogen Atom below.
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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.

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.

## Physical Chemistry

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## Physical Chemistry

85 videos|131 docs|67 tests