What type of reaction is al + 3cuso4 --> al2(so4)3 + 3 cu

It's a Single Replacement (or Displacement) Reaction because the equation follows the basic format for that type of reaction.

For Single Replacement Reactions, the general formula is:

AB + C = AC + B

So, if there's an element and compound on both sides of the equation, it's single replacement.

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6