Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR-NET 2019 · Marks: 2 · Difficulty: Medium
Match the items in Column I with those of Column II
Column I (species)
Column I (structure/properties)
(a) NaH
(i) Polymeric chain
(b) $\mathrm{BeH_2}$
(ii) Interstitial hydride
(c) $\mathrm{HfH_{2.10}}$
(iii) Tricapped trigonal prismatic
(d) $\mathrm{[TcH_9]}$
(iv) Saline hydride
The correct match is.
(a)a-iv, b-ii c-iii, d-i
(b)a-i, b-iv, c-ii, d-iii
(c)a-iv, b-i, c-ii, d-iii
(d)a-iv, b-i, c-iii, d-ii.
Answer
Answer (as printed): C
Explanation
• Alkali metal hydrides are saline hydrides.• $\mathrm{BeH_2}$ has a polymeric structure with 3c-2e bonding.• Bigger metal hydrides are usually interstitial hydrides, as $\mathrm{H^{-}}$ can be trapped in their bigger voids.• $[\mathrm{TcH_9}]^{2-}$ is trigonal tricapped prismatic.