Question

2) Choose the odd one out i) cu, Na, Pt, Al.​

Answer 1

Platinum (Pt)

Explanation: Platinum is one of the least reactive metals. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal.

Answer 2

Answer: Sodium (Na)

Explanation:

I think Sodium (Na), because it can be easily cut with a knife whereas others cannot be cut easily.

Hope this is enough!!.