Chose the statements below that are TRUE about bases. Group of answer choices Metals in the second group make bases of the form M(OH)2 Ammonium is an example of a "Nitrogen with 3 groups" base Metals in the first group make bases of the form M(OH)2 A nitrogen with three groups and a lone pair is a base since it can accept a proton HNO3 has N as the central atom so it is a base

Explanation:

The answer choices are:

1. Metals in the second group make bases of the form M(OH)₂

TRUE

The metals in the second group have two valence electrons, thus they can lose them to form cation with +2 oxidation state and bond with two (OH)⁻ groups, forming bases with the general formula M(OH)₂.  For instance, Mg(OH)₂ and Ca(OH)₂.

2.  Ammonium is an example of a "Nitrogen with 3 groups" base

FALSE

Ammonium is NH₃. The "nitrogen with 3 groups" base are the compounds where the three hidrogens are replaced with R-groups, where R are alkyl groups.

3. Metals in the first group make bases of the form M(OH)₂

FALSE

Since metals in first group of the periodic table have one valence electrons they make bases of the form MOH. For instance, NaOH and KOH.

4. A nitrogen with three groups and a lone pair is a base since it can accept a proton

TRUE

Since nitrogen has five valence electrons, when it bonds to three groups, it will retain a lone pair of electrons which make it a base under the Lewis concept and can accept a proton.

5. HNO₃ has N as the central atom so it is a base

FALSE

It is true that N is the central atom in HNO₃ but this compound is an acid as it releases a proton in aqueous solution.