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Quizzes > Science > Chemistry

How Well Do You Know Polyatomic Ion Symbols? Take the Quiz!

Tackle polyatomic ion practice problems and master the ClO3 ion symbol

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style quiz banner featuring ClO3 and other ion symbols on dark blue background

Use this quiz to practice naming polyatomic ions, match symbols like ClO3, and build speed and accuracy. You'll get instant feedback to spot gaps before a test, and when you want more, try the full polyatomic set or the compound review.

What is the name of the polyatomic ion ClO3??
Hypochlorite
Perchlorate
Chlorite
Chlorate
The chlorate ion consists of one chlorine atom bonded to three oxygen atoms with an overall -1 charge. It is named chlorate to distinguish it from chlorite (ClO??) and perchlorate (ClO??). The '-ate' suffix indicates the common oxyanion with more oxygens than '-ite'. For more information see .
What is the name of the polyatomic ion CO3²??
Carboxylate
Bicarbonate
Carbonate
Cyanate
CO?²? is known as the carbonate ion, with two negative charges distributed over three oxygens bonded to one carbon. Bicarbonate refers to HCO??, which has one hydrogen. The '-ate' ending denotes the higher oxygen oxyanion. See for more details.
What is the name of the polyatomic ion SO4²??
Thiosulfate
Sulfate
Sulfite
Hydrogen sulfate
SO?²? is the sulfate ion, the most common oxyanion of sulfur with four oxygens and a -2 charge. Sulfite (SO?²?) has one fewer oxygen, and hydrogen sulfate is HSO??. The 'ate' ending indicates the oxyanion with more oxygens. More at .
What is the name of the polyatomic ion NO2??
Nitrate
Peroxynitrite
Nitride
Nitrite
NO?? is called nitrite, with two oxygens on nitrogen and a -1 charge. Nitrate (NO??) has three oxygens. The '-ite' suffix denotes one fewer oxygen than the '-ate' form. For further reading see .
What is the name of the polyatomic ion NO3??
Nitrite
Peroxynitrate
Nitride
Nitrate
NO?? is the nitrate ion, recognized by three oxygens attached to nitrogen with a -1 charge. Nitrite (NO??) has only two oxygens. The '-ate' ending identifies the oxyanion with the higher oxygen count in a series. More at .
What is the name of the polyatomic ion NH4??
Azide
Ammonium
Hydrazinium
Nitronium
NH?? is known as the ammonium ion, formed when ammonia (NH?) accepts a proton. It's a common cation in salts like NH?Cl. Hydrazinium refers to N?H??, and nitronium is NO??. More details at .
What is the name of the polyatomic ion PO4³??
Hypophosphite
Phosphite
Hydrogen phosphate
Phosphate
PO?³? is the phosphate ion, containing phosphorus bonded to four oxygens with a net -3 charge. Phosphite (PO?³?) has one fewer oxygen. Hydrogen phosphate is HPO?²?. See .
What is the name of the polyatomic ion OH??
Oxide
Peroxide
Hydroxide
Hypohalite
OH? is the hydroxide ion, made of one oxygen and one hydrogen carrying a -1 charge. Oxide is O²?, peroxide is O?²?, and hypohalite refers to OCl? or similar halogen oxyanions. Learn more at .
What is the name of the polyatomic ion ClO2??
Perchlorate
Hypochlorite
Chlorite
Chlorate
ClO?? is called chlorite, the oxyanion with two oxygens bonded to chlorine and a -1 charge. Chlorate has three oxygens, perchlorate has four, and hypochlorite has one. The '-ite' suffix denotes one fewer oxygen than '-ate'. See .
What is the name of the polyatomic ion ClO??
Perchlorate
Chlorite
Hypochlorite
Chlorate
ClO? is the hypochlorite ion, indicating the oxyanion with one oxygen. Chlorite has two oxygens, chlorate has three, and perchlorate has four. The prefix 'hypo-' plus '-ite' shows the lowest oxygen count. More at .
What is the name of the polyatomic ion ClO4??
Chlorite
Perchlorate
Chlorate
Hypochlorite
ClO?? is called perchlorate, the oxyanion with four oxygens and a -1 charge. The 'per-' prefix indicates one more oxygen than chlorate (ClO??). Hypochlorite and chlorite have fewer oxygens. For details see .
What is the name of the polyatomic ion Cr2O7²??
Bichromate
Chromate
Dichromate
Chromite
Cr?O?²? is the dichromate ion, composed of two chromium atoms and seven oxygens carrying a -2 charge. Chromate is CrO?²?. The 'di-' prefix indicates two chromium centers. See for more.
What is the name of the polyatomic ion HSO4??
Sulfate
Hydrogen sulfate
Thiosulfate
Bisulfite
HSO?? is called hydrogen sulfate or bisulfate, indicating the addition of one proton to sulfate (SO?²?). It retains a -1 charge. Bisulfite is HSO??, related to sulfite. More at .
What is the name of the polyatomic ion MnO4??
Manganyl
Permanganate
Manganate
Hypomanganate
MnO?? is known as permanganate, the oxyanion with manganese in its highest common oxidation state. Manganate is MnO?²?. The 'per-' prefix indicates one extra negative charge on the oxyanion. See .
What is the name of the polyatomic ion C2O4²??
Carbonate
Peroxalate
Formate
Oxalate
C?O?²? is the oxalate ion, containing two carbon atoms each bonded to two oxygens overall carrying a -2 charge. Formate is HCO??, and carbonate is CO?²?. Oxalate is derived from oxalic acid. More at .
What is the name of the polyatomic ion H2PO4??
Dihydrogen phosphate
Phosphate
Hydrogen phosphate
Phosphite
H?PO?? is dihydrogen phosphate, indicating two acidic hydrogens are still bound to phosphate (PO?³?). Hydrogen phosphate is HPO?²?. The naming shows how many protons remain attached. See .
What is the name of the compound K2SO4?
Potassium sulfide
Potassium sulfate
Dipotasium sulfite
Potassium bisulfate
K?SO? comprises two potassium cations (K?) balancing one sulfate anion (SO?²?). Its correct name is potassium sulfate. 'Bisulfate' refers to HSO??, and sulfite is SO?²?. For more see .
What is the name of the compound (NH4)2CO3?
Ammonium bicarbonate
Diammonium carbonate
Ammonium oxide
Ammonium carbonate
(NH?)?CO? consists of two ammonium ions (NH??) and one carbonate ion (CO?²?). It is named ammonium carbonate. Ammonium bicarbonate is NH?HCO? with HCO??. See .
What is the name of the compound NaHCO3?
Sodium hydrogen sulfate
Sodium bicarbonate
Sodium carbonate
Sodium hydrogencarbonate
NaHCO? contains sodium cation (Na?) and bicarbonate anion (HCO??). Its name is sodium bicarbonate. The alternative name sodium hydrogen carbonate is correct IUPAC, but bicarbonate is most common. More info at .
What is the formula for iron(III) phosphate?
FePO4
Fe3(PO4)2
FePO4
FePO4·3H2O
Iron(III) phosphate contains Fe³? and PO?³? in a 1:1 ratio, giving FePO?. No subscripts are required beyond one. Hydrates like FePO?·3H?O are different compounds. See .
What is the formula for copper(II) nitrate?
Cu(NO3)2
Cu2(N2O6)
Cu2(NO3)
Cu(NO3)
Copper(II) has a +2 charge and each nitrate (NO??) has a -1 charge, so two nitrate ions balance one Cu²? giving Cu(NO?)?. Single nitrate would leave a charge imbalance. More at .
What is the name of the compound Al2(SO4)3?
Aluminum bisulfate
Dialuminum trisulfide
Aluminum sulfate
Aluminum sulfite
Al?(SO?)? consists of two Al³? cations balancing three SO?²? anions, named aluminum sulfate. Sulfite is SO?²?, and bisulfate is HSO??. See .
What is the formula for magnesium hydroxide?
Mg(OH)2
Mg2(OH)2
MgOH
MgOH2
Magnesium has a +2 charge and hydroxide has a -1 charge, so two hydroxide ions balance one Mg²? giving Mg(OH)?. MgOH would leave a charge imbalance. More at .
What is the name of the compound Ga(ClO3)3?
Gallium hypochlorite
Gallium chlorate
Gallium chlorite
Gallium perchlorate
Ga³? combined with three chlorate ions (ClO??) yields Ga(ClO?)?, named gallium chlorate. Perchlorate is ClO??, chlorite is ClO??, hypochlorite is ClO?. See .
What is the oxidation state of chlorine in the chlorate ion, ClO3??
+1
+7
+5
+3
In ClO??, each oxygen is -2, so total for three oxygens is -6. The overall charge is -1, so chlorine must be +5 to balance (-6 + 5 = -1). This oxidation state is common for chlorate. For more see .
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Study Outcomes

  1. Understand Polyatomic Ion Nomenclature -

    Learn the systematic rules and suffixes used in naming polyatomic ions, providing a clear foundation for all naming polyatomic ions practice.

  2. Identify the ClO3❻ Ion -

    Recognize and recall the formula, charge, and correct name (chlorate) for the ClO3 polyatomic ion in various chemical contexts.

  3. Apply Naming Rules to Common Ions -

    Use IUPAC conventions to accurately name and write formulas for familiar polyatomic ions such as ammonium and acetate during quiz-style practice.

  4. Analyze Polyatomic Ion Practice Problems -

    Break down challenging polyatomic naming practice problems into manageable steps, ensuring you can tackle both symbol-to-name and name-to-symbol questions.

  5. Improve Speed and Accuracy -

    Engage with timed, scored exercises to sharpen your symbol skills and track your progress as you master naming polyatomic ions.

Cheat Sheet

  1. Memorize Common Polyatomic Ion Families -

    Familiarity with families like nitrates (NO3❻), sulfates (SO4²❻), and ammonium (NH4❺) builds a solid foundation. Use university resources such as Purdue's chemistry department or IUPAC guidelines to verify formulas and charges, then quiz yourself regularly to reinforce memory.

  2. Master the Suffix Rules: - ate, - ite, Per - , and Hypo - -

    In naming polyatomic ions practice, the - ate suffix indicates the most common oxygen count, while - ite has one fewer oxygen. Remember the per - /hypo - prefixes: perchlorate (ClO4❻) has one more oxygen than chlorate (ClO3❻), and hypochlorite (ClO❻) has one fewer than chlorite (ClO2❻).

  3. Focus on the ClO3 Polyatomic Ion -

    The ClO3 polyatomic ion is called chlorate and carries a - 1 charge; it often appears in redox reactions and disinfectant formulas. Cross-reference IUPAC naming conventions to ensure correct symbol skills and practice naming variations like perchlorate and chlorite for deeper understanding.

  4. Apply Mnemonic Devices for Quick Recall -

    Creative mnemonics like "Nick the Camel Ate a Clam for Supper in Phoenix" helps you remember Nitrate (NO3❻), Carbonate (CO3²❻), Chlorate (ClO3❻), Sulfate (SO4²❻), and Phosphate (PO4³❻). Turning lists into playful phrases taps into memory research from cognitive psychology departments at major universities.

  5. Engage with Polyatomic Ion Practice Problems -

    Active practice using quizzes from respected platforms (e.g., ACS, Khan Academy) sharpens your polyatomic naming practice under timed conditions. Track progress, revisit missed items, and celebrate small wins to build confidence and mastery over symbol skills.

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