OnChemistry Quiz

Consider the electronic configuration 1s²2s²2p⁶3s³. Which of the following rule(s) for filling electronic configurations MUST be violated?

• Pauli only

• Aufbau, Hund and Pauli

• Aufbau only

• Aufbau and Pauli

What is the electronic configuration of Titanium, Ti?

• [Ar]4s²3d²

• [Ar]3s²3d²

• [Ar]3s²4d²

• [Kr]4s²3d²

Consider the labeled bonds in the molecule below and rank them from least to most polar in terms of difference in electronegativity.

• d < c < a < e < b

• d < c < e < a < b

• a < b < c < d < e

• e < b < d < c < a

If you draw formaldehyde, CH₂O with a hydrogen on each end of the C=O bond, what is the formal charge on the C and on the oxygen?

• +1 on the Carbon and -1 on the Oxygen

• 0 on the Carbon and 0 on the Oxygen

• -1 on the Carbon and +1 on the Oxygen

• 0 on the Carbon and -1 on the Oxygen

What kind of carbon-carbon bond is in a molecule of ethylene (C₂H₄)?

• Double

• Triple

• Single

• Ionic

How many lone pairs of electrons are around the central atom in xenon difluoride?

• 2

• 5

• 4

• 3

Which of the following has bond angles slightly less than 109.5°?

• CH₃⁺

• I₃⁻

• HOCl

• O₃

What is the shape (molecular geometry) of IF₄⁺?

• Tetrahedral

• Square planar

• Trigonal bipyramidal

• Octahedral

Which of the following is polar?

• XeF₄

• SF₆

• PCl₅

• IF₅

Which of the following statements about the polarity of a molecule is INCORRECT?

• SF₆ is non-polar

• CO₂ is non-polar

• ICl₂⁻¹ is polar

• PCl₃ is polar