Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR-NET 2020 · Marks: 2 · Difficulty: Medium
Choose the correct statements for the Group 15 halides:(i) $\mathrm{AsCl_3}$ can form complexes of type $\mathrm{[AsCl_4]^-}$ in the presence of a chloride source(ii) $\mathrm{PF_3}$ acts as a strong a-donor ligand towards d-metals(iii) In the solid state, $\mathrm{SbF_5}$ has a trigonal bipyramidal structure(iv) The reaction of $\mathrm{SbF_5}$ with anhydrous HF generates $\mathrm{[H_2F]^+}$ ions
(a)(i) and (iv)
(b)(ii) , (iii) and (iv)
(c)(i) , (iii) and (iv)
(d)(ii) and (iii)
Answer
Answer (as printed): A
Explanation
a. $\mathrm{SbF_5} + 2\mathrm{HF} \rightarrow [\mathrm{H_2F}]^{+}[\mathrm{SbF_6}]^{-}$b. In the solid state, $\mathrm{SbF_5}$ is tetrameric, thus it has an octahedral structure.c. $\mathrm{PF_3}$ acts as a strong $\pi$-acceptor ligand towards d-metals.d. $\mathrm{AsCl_3}$ may act as either a $\mathrm{Cl^{-}}$ donor or acceptor with an appropriate reagent. Thus, in the presence of a chloride source, $\mathrm{AsCl_3}$ can form complexes of the type $[\mathrm{AsCl_4}]^{-}$.