iGCSE Chemistry Multiple Choice (Extended) : 8.2 Group I properties: Exam Style Questions Paper 2

Ans: C

In Group I (alkali metals), melting points decrease down the group, so lithium (higher in the group) has a higher melting point than potassium. Option A is incorrect because bromine is less reactive than chlorine and can’t displace it. Option B is wrong as iodine exists as diatomic I₂ molecules. Option D is incorrect because reactivity increases down Group I, making potassium more reactive than sodium.