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Pharmacy College Admission Test - Chemistry Sample Test

1 of 5

Which of the following pairs of chemical symbols and conventional names are not matched correctly?

Pair I: Cu⁺ and Copper(II)
Pair II: Fe³⁺ and Iron(III)
Pair III: Fe³⁺ and Ferrous
Pair IV: N³⁺ and Nitride

Correct Answer:

pairs i, iii, and iv.
pairs i, iii, and iv are not matched correctly. here's why:

pair i: cu+ and copper(ii) is incorrect. the chemical symbol cu+ represents a copper ion with a +1 charge, which should be named copper(i), not copper(ii). copper(ii) would correspond to cu2+, indicating a copper ion with a +2 charge.

pair ii: fe3+ and iron(iii) is correctly matched. fe3+ represents an iron ion with a +3 charge, which is correctly named iron(iii).

pair iii: fe3+ and ferrous is incorrect. the term "ferrous" refers to iron in the +2 oxidation state (fe2+), which is different from fe3+. the correct term for fe3+ is "ferric."

pair iv: n3+ and nitride is incorrect. the term "nitride" is used to denote a nitrogen ion with a -3 charge (n3-), not a positive charge. n3+ does not conventionally exist as a stable ion in simple chemistry, and using the term "nitride" for n3+ is incorrect.

thus, the correct answer is that pairs i, iii, and iv are not matched correctly due to errors in the naming conventions related to the charges and states of the ions.