Match the items in Column I with those of Column II. Column I (species) Column II (structure/properties) a. NaH i. polymeric chain b. BeH2 ii. interstitial hydride c. HfH2.10 iii. tricapped trigonal prismatic d. [TcH9]2− iv. saline hydride The correct match is
a - iv, b - i, c - ii, d - iii
Hydride Matching Explained
This question asks us to match different chemical species, specifically hydrides or hydride complexes, with their characteristic structures or properties. Let's analyze each species given in Column I and its typical classification or structure to find the correct match in Column II.
Understanding the Species and Properties
We have four species and four descriptions:
- NaH: Sodium hydride. Sodium (Na) is an alkali metal from Group 1. Hydrides of alkali metals are typically ionic compounds, formed by electron transfer from the metal to hydrogen, creating M+ and H- ions. These are known as saline hydrides.
- BeH\(_{2}\): Beryllium hydride. Beryllium (Be) is an alkaline earth metal from Group 2. While other alkaline earth metal hydrides are more ionic, BeH\(_{2}\) exhibits significant covalent character and exists as a polymer in the solid state, with hydrogen atoms bridging between beryllium atoms, forming a polymeric chain structure.
- HfH\(_{2.10}\): Hafnium hydride. Hafnium (Hf) is a transition metal. Transition metals can form hydrides where hydrogen atoms occupy interstitial sites (holes) within the metal lattice. These are called interstitial hydrides. They often have non-stoichiometric compositions, as indicated by the formula HfH\(_{2.10}\).
- [TcH\(_{9}\)]\(^{2-}\): Technetium nonahydride complex ion. Technetium (Tc) is a transition metal. Complex ions involving transition metals and hydride ligands can have specific coordination geometries. The [TcH\(_{9}\)]\(^{2-}\) ion is known to have a tricapped trigonal prismatic geometry, where a trigonal prism has three capping positions on its rectangular faces.
Matching Column I with Column II
Based on the properties and structures described above, we can make the following matches:
- a. NaH: This is a saline hydride. Matches with iv.
- b. BeH\(_{2}\): This forms a polymeric chain structure. Matches with i.
- c. HfH\(_{2.10}\): This is an interstitial hydride with a non-stoichiometric composition. Matches with ii.
- d. [TcH\(_{9}\)]\(^{2-}\): This has a tricapped trigonal prismatic structure. Matches with iii.
So the correct matching is: a - iv, b - i, c - ii, d - iii.
Summary of Matches
| Column I (Species) | Column II (Structure/Properties) | Match |
|---|---|---|
| a. NaH | iv. saline hydride | a - iv |
| b. BeH\(_{2}\) | i. polymeric chain | b - i |
| c. HfH\(_{2.10}\) | ii. interstitial hydride | c - ii |
| d. [TcH\(_{9}\)]\(^{2-}\) | iii. tricapped trigonal prismatic | d - iii |
Comparing this matching with the given options, the correct option is the one that states a - iv, b - i, c - ii, d - iii.
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