Question

*Which of the following does not fit into the group according to the property of the composite radical?*

1️⃣ NH₄⁺
2️⃣ SO₄²⁻
3️⃣ Mg²⁺
4️⃣ OH⁻​

Answer 1

Answer:

SO₄²

Explanation:

Answer 2

Answer:     $Mg^{2+}$

Explanation:

Composite radicals are groups of atoms of different elements, which may carry either positive charge or negative charge ,which behave exactly like a single atom.

here,

from the definition

all others are composite radical.