AP EAPCET 07-Jul-2022 Shift 2 Paper

Electron precise hydrides have the exact number of electrons needed to form covalent bonds. These are formed by group 14 elements such as CH4,SiH4, etc. Therefore, A of list I matches with (i) of list II.
Saline hydrides (also known as ionic hydrides) are compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals such as MgH2. Therefore, B of list I matches with (iii) of list II.
The compounds in which the central atom has an incomplete octet are called electron-deficient hydrides. Such as boron in B2H6 has incomplete octet. Therefore, C of list I matches with (iv) of list II.
Electron rich hydrides These hydrides have one or more lone pairs of electrons around the central more electronegative element such as H2O. Therefore, D of list I matches with (ii) of list II.