Question

which of the following is not a binary compound?
a $k h_{2} p o_{4}$
b $nacl$
c $kbr$

Explanation:

A binary compound is a chemical compound composed of exactly two different elements. Let's analyze each option:

• Option b (NaCl): Composed of sodium (Na) and chlorine (Cl), two elements. So it is a binary compound.
• Option c (KBr): Composed of potassium (K) and bromine (Br), two elements. So it is a binary compound.
• Option a ($KH_2PO_4$): Composed of potassium (K), hydrogen (H), phosphorus (P), and oxygen (O). That's four different elements, so it is not a binary compound.

Answer:

a. $KH_2PO_4$