1) Which name is incorrect?

a) MgS magnesium monosulfide

b) FeCl₃ iron (III) chloride

c) Ca₃N₂ calcium nitride

d) Li₂O lithium oxide

e) HBr hydrobromic acid

2) Which substance is incorrectly labeled?

a) Na₂SO₄ . 10H₂O hydrate

b) H₃PO₄ acid

c) KOH base

d) PF₃ salt

e) C₃H₈O₃ element

3) Which of the following is not ionic?

a) Li₂S

b) BaCl₂

c) CaF₂

d) KBr

e) CH₄

4) Which formula is incorrect?

a) LiF

b) Na₃PO₄

c) NaOH

d) CaBr₂

e) AlS₂

5) Which compound is not a salt?

a) Li₂CO₃

b) Na₃PO₄

c) NaOH

d) CaBr₂

e) MgCl₂

6) Which compound is a pentahydrate?

a) CuSO₄ 5H₂O

b) K₄P₂O₇ 3H₂O

c) K₂SO₃ 2H₂O

d) CuCl₂ 2H₂O

e) NiSO₄ 4H₂O

7) Predict the product that forms when manganese (II) reacts with sulfur.

a) MgS₂

b) MnS

c) Mn₂S₂

d) Mn₂S

e) MgS

8) Which of the following is correct?

a) LiSO₄

b) SrNO₃

c) BaPO₄

d) CaCO₃

e) MgOH