Given the three statements below, pick the best answer.
I. [AlCl₄]^- is tetrahedral.
II. The Cl - N - Cl angle in NCl₃ is about 120 ° .
III. The H - S - H angle in H₂S is about 109 ° .

Question

Given the three statements below, pick the best answer. I. [AlCl₄]^- is tetrahedral. II. The Cl - N - Cl angle in NCl₃ is about 120 ° . III. The H - S - H angle in H₂S is about 109 ° .

Quizplus · Accepted Answer

Statement I describes a tetrahedral molecule, which means it has 4 bonding pairs and no lone pairs resulting in an ideal 109.5° bond angle. Since the statement says the angle is below that value, it is false.

Statement II describes a molecule with a trigonal planar geometry, which will have bond angles of around 120°. This statement is true.

Statement III describes a molecule with a bent shape and two lone pairs, resulting in a bond angle less than the ideal 109.5° tetrahedral bond angle. The value given in the statement, 109°, is close to the expected angle for this geometry. This statement is also true.

Given the Three Statements Below, Pick the Best Answer