Which of the following molecules would have the most polar bonds? A) AsH_3 B) BH

Question

Which of the following molecules would have the most polar bonds? A) AsH_3 B) BH_3 C) NH_3 D) PCl_3 E) SO_3 What is the molecular geometry of an SF_4 molecule? A) tetrahedral B) square planar C) distorted tetrahedron (seesaw) D) square pyramidal E) octahedral Which diatomic molecule that would contain the strongest covalent bond? A) Br_2 B) Cl_2 C) H_2 D) N_2 E) O_2 Which diatomic molecule that would contain the longest covalent bond? A) Br_2 B) Cl_2 C) H_2 D) N_2 E) O_2 Which of the following molecule is a polar molecule? A) CS_2 B) BF_3 C) PCl_3 D) PCl_5 E) SF_6

Explanation / Answer

Q4-

MOST POLAR BOND -->

Electronegativity differences

AsH3 = 2.2 - 2.18 = 0.02

BH3 = 2. 2- 2.04 = 0.16

NH3 = 2.2 - 3.04 = 0.84

PCl3 = 3.16 - 2.19 = 0.97

SO3 = 3.44 - 2.58 = 0.86

the most polar is that with the highest value

so choose PCl3

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