1) choose the best answer.
which of these is not named correctly?
mgo - magnesium oxide
cacl₂ - calcium chloride
na₂s - sodium sulfate
libr - lithium bromide
2) choose the best answer.
which of these is the correct name for fe₂o₃?
iron (ii) oxide
iron (iii) oxide
iron oxide
iron (ii) oxide (iii)

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Accepted Answer

### Sub - Question 1
# Brief Explanations:
To determine which compound is not named correctly, we analyze each option based on ionic compound naming rules. For ionic compounds, we name the cation first (using the element's name) and then the anion (using the root of the non - metal name plus - ide).
- For $MgO$: Magnesium ($Mg^{2 +}$) is the cation and oxide ($O^{2-}$) is the anion. The name magnesium oxide is correct.
- For $CaCl_2$: Calcium ($Ca^{2+}$) is the cation and chloride ($Cl^-$) is the anion. The name calcium chloride is correct.
- For $Na_2S$: Sodium ($Na^+$) is the cation and sulfide ($S^{2 -}$) is the anion. The correct name should be sodium sulfide, not sodium sulfate (sulfate is $SO_4^{2-}$).
- For $LiBr$: Lithium ($Li^+$) is the cation and bromide ($Br^-$) is the anion. The name lithium bromide is correct.
# Answer:
C. $Na_2S$ – sodium sulfate

### Sub - Question 2
# Brief Explanations:
To name $Fe_2O_3$, we first find the charge of iron. Let the charge of Fe be $x$. In $Fe_2O_3$, oxygen has a charge of $- 2$. Using the formula for charge balance ($2x+3\times(- 2)=0$), we solve for $x$: $2x - 6 = 0$, so $2x=6$ and $x = + 3$. So iron has a +3 charge, and the compound is named iron (III) oxide.
# Answer:
B. iron (III) oxide

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