Question

Which one of the following formulas of ionic compounds is the least likely to be correct? Select one: a. NH4Cl b. Ba(OH)2 c. Na2SO4 d. Ca2NO3 e. Cu(CN)2

Answer 1

The answer to your question is letter d. Ca₂NO₃

Step-by-step explanation:

a. NH₄Cl This formula is correct NH₄⁺¹ + Cl⁻¹ = NH₄Cl

b. Ba(OH)₂ This formula is also correct Ba⁺² + OH¹⁻ = Ba(OH)₂

c. Na₂SO₄ This formula is correct Na⁺¹ + SO₄⁻² = Na₂SO₄

d. Ca₂NO₃ This formula is wrong Ca⁺² + NO₃⁻¹ = Ca(NO₃)₂

e. Cu(CN)₂ This formula is correct Cu⁺² + CN⁻¹ = Cu(CN)₂