Question

Select the odd one out O a. Hydrogen O b. Salt O c. Helium 0 d, Iron​

Answer 1

Answer:

I think its something from Iron and Salt.

Answer 2

The odd one out is selected below - b. Salt.

• Salt is a compound as it has a uniform composition of more than two types of atoms.
• Salt is chemically sodium chloride, thus it consists of two elements, sodium and chlorine.
• Hydrogen contains only one type of molecule, i.e., H₂. Therefore, it is an element.
• Helium also has one type of atom of He. Hence, it is an element.
• Iron comprise Fe, thus it is also an element.
• Thus, out of the given four options, only salt is a compound, while the other three are elements. Hence, salt is the odd one out.