How much energy is needed to remove the electron from the n = 2 level of a hydrogen atom (Eₙ = −13.6/n² eV)?
Correct answer A. 3.4 eV
Topic / 39 questions
Atomic Structure MCQs
Page 2 of Atomic Structure multiple-choice questions with answers. Tap an option to check yourself.
Page 2 of 2
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
What is the wavelength of the line emitted when a hydrogen electron falls from n = 3 to n = 2 (R = 1.097 × 10⁷ m⁻¹)?
Correct answer B. 656 nm
The lines of the Balmer series in the hydrogen spectrum are produced when electrons fall to which level?
Correct answer B. n = 2
Advertisement
An s orbital has which shape?
Correct answer C. Spherical
Which orbital consists of two lobes along the z axis with a doughnut-shaped ring around its centre?
Correct answer C. dz²
What is the maximum number of electrons that the fourth shell (n = 4) can hold?
Correct answer C. 32
Why are positive rays deflected less than cathode rays by the same electric or magnetic field?
Correct answer A. Positive ions are much heavier than electrons
What is the energy of a photon of wavelength 600 nm (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)?
Correct answer D. 3.31 × 10⁻¹⁹ J
What is the energy of one photon of frequency 1.0 × 10¹⁵ Hz (h = 6.63 × 10⁻³⁴ J s)?
Correct answer D. 6.63 × 10⁻¹⁹ J
Advertisement
According to Planck’s quantum theory, the energy of a photon is ____
Correct answer D. inversely proportional to its wavelength
According to Planck’s quantum theory, energy is emitted or absorbed ____
Correct answer A. discontinuously in small packets called quanta
How many orbitals are present in the third shell (n = 3)?
Correct answer A. 9
Which set of quantum numbers (n, l, m, s) is NOT allowed for an electron?
Correct answer A. n = 2, l = 2, m = 0, s = +½
Which quantum number mainly determines the shape of an orbital?
Correct answer B. Azimuthal quantum number (l)
Which d orbital has its four lobes lying along the x and y axes?
Correct answer B. d(x²−y²)
Advertisement
In a discharge tube with a perforated cathode, positive (canal) rays travel ____
Correct answer C. towards the cathode and pass through holes in it
The mass of a proton is about how many times the mass of an electron?
Correct answer A. 1836
Who first observed canal (positive) rays in a discharge tube?
Correct answer D. Eugen Goldstein
For which gas in the discharge tube do positive rays have the largest e/m value?
Correct answer A. Hydrogen