Choose the correctly named ionic compound.

A. Li₃N, lithium nitride
Correct!

B. Mg₂Si, dimagnesium silide
Incorrect. Prefixes are not used when naming ionic compounds.

C. NH₃,nitrogen hydride
Incorrect. This is not an ionic compound.

D. NaCl, sodium monochloride
Incorrect. Prefixes are not used when naming ionic compounds.

Choose the compound matched with its correct name.

A.CoCrO₄, cobalt (III) chromate
Incorrect. Cobalt’s charge must cancel out the charge of the chromate, which is -2, so it should be cobalt (II) chromate.

B. MgCN, magnesium nitride
Incorrect. CN is not nitride.

C. LiNO₃, lithium nitrate
Correct!

D. BeCl₂,beryllium dichloride
Incorrect. Prefixes are not used when naming ionic compounds.

What is the correct name for the following compound?

PtO₂

A. Platinum oxide
Incorrect. Platinum is a transition metal, so a roman numeral must be used to show which of the variable charges it is.

B. Platinum dioxide
Incorrect. Ionic compounds containing transition metals do not use prefixes to show charge.

C. Platinum (I) oxide
Incorrect. The charge on oxygen is always -2, so there is no way a charge of +1 would cancel it out.

D. Platinum (IV) oxide
Correct!

The presence of an OH^-1 anion in a compound classifies that compound as a base. The correct name for Fe(OH)₃ is —

A. Iron (III) hydroxide
Correct!

B. Iron hydroxide (III)
Incorrect. The roman numeral does not go at the end of the compound.

C. Iron hydroxide
Incorrect. Iron is a transition metal and therefore needs a roman numeral to show the charge.

D. Iron hydroxide - 3
Incorrect. You do not put the charge in this way.

The chemical name of Mg₃(PO₄)₂ is —

A. magnesium phosphate
Correct!

B. magnesium phosphide
Incorrect. Phosphide is just P.

C. magnesium (II) phosphate
Incorrect. Magnesium is not a transition metal; you do not use roman numerals.

D. magnesium (III) phosphide
Incorrect. Magnesium is not a transition metal, you do not use roman numerals and phosphide is just P.