#1
What is the chemical formula for sodium chloride?
NaCl
ExplanationSodium chloride is composed of sodium ions (Na+) and chloride ions (Cl-), forming a stable ionic compound.
#2
Which of the following is an example of an ionic compound?
NaCl
ExplanationNaCl (sodium chloride) is a classic example of an ionic compound formed by the electrostatic attraction between sodium (Na+) and chloride (Cl-) ions.
#3
What is the formula for magnesium nitrate?
Mg(NO₃)₂
ExplanationMagnesium nitrate (Mg(NO₃)₂) is a crystalline solid, composed of one magnesium ion (Mg²⁺) and two nitrate ions (NO₃⁻).
#4
Which of the following represents a polyatomic ion?
Nitrate (NO₃)
ExplanationNitrate (NO₃⁻) is a polyatomic ion, composed of one nitrogen atom and three oxygen atoms, carrying a 1- charge.
#5
What is the formula for copper(II) sulfate?
CuSO₄
ExplanationCopper(II) sulfate (CuSO₄) is a chemical compound used in agriculture and as a fungicide.
#6
What is the name of the compound with the formula CaCO₃?
Calcium carbonate
ExplanationCalcium carbonate (CaCO₃) is a chemical compound commonly found in limestone, chalk, and marble.
#7
Which of the following ions has a 2- charge?
Sulfate ion
ExplanationThe sulfate ion (SO₄²⁻) carries a 2- charge due to its composition of sulfur and oxygen atoms.
#8
What is the name of the compound with the formula FeCl₃?
Iron(III) chloride
ExplanationIron(III) chloride (FeCl₃) is an inorganic compound used in water treatment, dyeing, and etching.
#9
Which of the following is a correct name for the compound HCl?
Hydrochloric acid
ExplanationHydrochloric acid (HCl) is a strong acid commonly used in industrial and laboratory settings.
#10
What is the name of the compound with the formula Pb(NO₃)₂?
Lead nitrate
ExplanationLead nitrate (Pb(NO₃)₂) is a toxic inorganic compound used in various applications such as pyrotechnics and in the manufacture of matches.
#11
What is the chemical formula for ammonium sulfate?
(NH₄)₂SO₄
ExplanationAmmonium sulfate ((NH₄)₂SO₄) is an inorganic compound commonly used as a fertilizer and in various industrial applications.
#12
What is the chemical formula for potassium permanganate?
KMnO₄
ExplanationPotassium permanganate (KMnO₄) is a powerful oxidizing agent and disinfectant.
#13
What is the chemical formula for iron(II) chloride?
FeCl₂
ExplanationIron(II) chloride (FeCl₂) is an inorganic compound used in water purification and as a precursor to other iron compounds.
#14
What is the chemical formula for aluminum oxide?
Al₂O₃
ExplanationAluminum oxide (Al₂O₃) is a compound used as an abrasive, in ceramics, and as a refractory material.
#15
What is the chemical formula for potassium iodide?
KI
ExplanationPotassium iodide (KI) is a salt used in medicine and photography.