Question

which of the following formulas is incorrect?
aio₃
kno₃
li₂o
caso₄
kbr
question 12
1 pts
the correct name for nio is
nickel(i) monoxide
nickel(i) oxide
nickel(ii) oxide
nickel monoxide

Explanation:

Step1: Check oxidation - states for first question

Aluminum has an oxidation state of +3 and oxygen has an oxidation state of -2. The correct formula for aluminum oxide should be $Al_2O_3$, so $AlO_3$ is incorrect. Potassium ($K$) has an oxidation state of +1, nitrate ($NO_3^-$) has a charge of -1, so $KNO_3$ is correct. Lithium ($Li$) has an oxidation state of +1, oxygen has -2, so $Li_2O$ is correct. Calcium ($Ca$) has an oxidation state of +2, sulfate ($SO_4^{2 - }$) has a charge of -2, so $CaSO_4$ is correct. Potassium ($K$) has an oxidation state of +1, bromine ($Br$) has -1, so $KBr$ is correct.

Step2: Determine name for second question

In $NiO$, nickel ($Ni$) has an oxidation state of +2 (since oxygen has an oxidation state of -2). The name for $NiO$ is nickel(II) oxide.

Answer:

First question: A. $AlO_3$
Second question: C. nickel(II) oxide