Which of the following shows the chemical formula for the polyatomic ionic compound potassium sulfate? Question 4 options: a) K(SO4)2 b) K2SO4 c) KSO4 d) K2(SO4)2 What is the chemical name for the ionic compound, Pb(NO3)2? Question 5 options: a) lead nitrate(II) b) lead nitrate(IV) c) lead(IV) nitrate d) lead(II) nitrate Which of the following shows the chemical formula for the binary ionic compound sodium fluoride? Question 9 options: a) Na2F b) Na3F2 c) NaF d) NaF2 Which of the following shows the chemical formula for the polyatomic ionic compound potassium sulfate? Question 4 options: a) K(SO4)2 b) K2SO4 c) KSO4 d) K2(SO4)2 What is the chemical name for the ionic compound, Pb(NO3)2? Question 5 options: a) lead nitrate(II) b) lead nitrate(IV) c) lead(IV) nitrate d) lead(II) nitrate Which of the following shows the chemical formula for the binary ionic compound sodium fluoride? Question 9 options: a) Na2F b) Na3F2 c) NaF d) NaF2
The Correct Answer and Explanation is :
Here are the answers and explanations for the questions:
- What is the chemical formula for the polyatomic ionic compound potassium sulfate?
- Correct Answer: b) K2SO4
- Explanation: Potassium sulfate consists of potassium (K) ions and sulfate (SO₄²⁻) ions. Potassium has a charge of +1, and sulfate has a charge of -2. To balance the charges, two potassium ions (each with a +1 charge) are required to pair with one sulfate ion (with a -2 charge), leading to the formula K₂SO₄. The correct formula is K₂SO₄, which matches option b).
- What is the chemical name for the ionic compound Pb(NO3)2?
- Correct Answer: d) lead(II) nitrate
- Explanation: The compound Pb(NO₃)₂ contains lead (Pb) and nitrate (NO₃⁻) ions. Lead can have multiple oxidation states, but in this compound, the lead ion has a +2 charge (since two nitrate ions, each with a -1 charge, are present). Thus, the oxidation state of lead is +2, which gives the name “lead(II) nitrate.” The correct answer is option d).
- What is the chemical formula for the binary ionic compound sodium fluoride?
- Correct Answer: c) NaF
- Explanation: Sodium fluoride is a binary ionic compound composed of sodium (Na) ions and fluoride (F) ions. Sodium has a +1 charge, and fluoride has a -1 charge. Since their charges are equal in magnitude but opposite in sign, one sodium ion pairs with one fluoride ion to form the compound NaF. Therefore, the correct formula is NaF, which matches option c).
These questions test your understanding of ionic compound nomenclature and formula determination based on charge balance and the rules for naming compounds.