All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 626 of 686
12501. Poise is the unit of _.
- A. Viscosity
- B. Surface Tension
- C. Density
- D. Pressure
Explanation: The explanation for this question will be added soon.
Correct answer: Viscosity- A. Viscosity
- B. Surface Tension
- C. Density
- D. Pressure
Explanation: The explanation for this question will be added soon.
Correct answer: Surface Tension- A. Water molar mass is 18.02
- B. Water forms dative bonding
- C. Water molecule is polar
- D. Water has high density
Explanation: To dissolve an ionic compound, the water molecules must be able to stabilise the ions that result from breaking the ionic bond.
Correct answer: Water molecule is polar- A. Dipole dipole forces
- B. Debye forces
- C. London dispersion forces
- D. H-bonding
Explanation: London's dispersion forces are the weakest of all the intermolecular forces.
Correct answer: London dispersion forces12505. Liquids have _.
- A. Definite volume
- B. Indefinite volume
- C. Irregular volume
- D. Changing volume
Explanation: The state of matter, which has a definite volume but no definite shape, is called liquid.In liquids, the molecules are close to each…
Correct answer: Definite volume12506. Iodine has greater heat of sublimation then its family members due to presence of stronger _.
- A. H-bonding
- B. London dispersion forces
- C. Dipole-dipole force
- D. Chemical bonding
Explanation: B is correct option because Iodine sublimes rather than melting and boiling.
Correct answer: London dispersion forces- A. Anisotropic liquids
- B. Nematic liquids
- C. Isotropic liquids
- D. Liquids
Explanation: a) Anisotropic liquids Anisotropic liquids are liquids that have different physical properties in different directions.
Correct answer: Anisotropic liquids12508. Liquids have _ ?
- A. Definite shape
- B. Indefinite shape
- C. Indefinite volume
- D. None of these
Explanation: Liquids do not have any definite shape however definite volume.
Correct answer: Indefinite shape- A. Friedrich Reinitzer
- B. William Crooks
- C. Bravis
- D. J. J. Thomson
Explanation: Liquid crystal was discovered by Friedrich Reinitzer, an Austrian botanist and chemist, in 1888.
Correct answer: Friedrich Reinitzer- A. -188.1
- B. 188.1
- C. 184.4
- D. -184.4
Explanation: Fluorine, the most reactive chemical element and the lightest member of the halogen elements and has a boiling point, −188 °C (−306 °F).
Correct answer: -188.1- A. Lower than gases
- B. Higher than solids
- C. Lower than solids
- D. Both A and B
Explanation: When a solid changes into a liquid the atoms inside experience two variations.
Correct answer: Both A and B- A. 10
- B. 6
- C. 18
- D. 0
Explanation: In this case l = 2then m = −2,−1,0,+1,+2so there are 5 orbitals and each orbital contain 2 electronsSo for value n = 3 and l= 2 there are…
Correct answer: 10- A. Hund's rule
- B. Aufbau principle
- C. Pauli's exclusion principle
- D. All of the above options are correct
Explanation: The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers.
Correct answer: Pauli's exclusion principle- A. Magnetic quantum number
- B. Spin quantum number
- C. Azimuthal quantum number
- D. Principle quantum number
Explanation: The Azimuthal quantum number (l) describes the shape of the orbital.
Correct answer: Azimuthal quantum number- A. n
- B. l
- C. m
- D. s
Explanation: The angular momentum quantum number determines the shape of the orbital.
Correct answer: l12516. If value of azimuthal quantum number is 2 then total values of magnetic qunatum number will be:
- A. 03
- B. 05
- C. 07
- D. 10
Explanation: Option B shows the correct value of magnetic quantum number when azimuthal quantum number is 2, the m value is: -2, -1 , 0 , +1 , +2
Correct answer: 05- A. Principal Quantum Number
- B. Spin Quantum Number
- C. Azimuthal Quantum Number
- D. Magnetic Quantum Number
Explanation: Spin quantum number is not explained through schrodinger's wave equation, whereas all other quantum number are explained according to that.
Correct answer: Spin Quantum Number12518. If uncertainty in the momentum of electron is zero, the uncertainty in its position would be _?
- A. Less than zero
- B. more than zero
- C. one
- D. infinite
Explanation: The uncertainty principle, as described by Heisenberg, states that it is impossible to know both the exact position and momentum of a…
Correct answer: infinite- A. The energy of an electron
- B. The location of an electron
- C. The size of an orbital
- D. All of these
Explanation: The principal quantum numbers tells us about, energy level, location of electrons as well as size of orbital.
Correct answer: All of these- A. Less than zero
- B. More than zero
- C. One
- D. Infinite
Explanation: According to Heisenberg's uncertainty principle, the more precisely the momentum of an electron is known, the more uncertainty there is in…
Correct answer: Infinite