Question

1. which formulas and their respective names do not match?

i) bao barium hydroxide
ii) co₂ carbon tetrachloride
iii) n₂o₄ dinitrogen tetroxide
iv) hf monohydrogen monofluoride
a) i and ii
b) ii and iii
c) i and iv
d) ii and iv

Explanation:

Step1: Analyze Pair I

$\text{BaO}$ is barium oxide; barium hydroxide is $\text{Ba(OH)}_2$. This pair does NOT match.

Step2: Analyze Pair II

$\text{CCl}_4$ is carbon tetrachloride. This pair matches.

Step3: Analyze Pair III

$\text{N}_2\text{O}_4$ is dinitrogen tetroxide. This pair matches.

Step4: Analyze Pair IV

$\text{HF}$ is monohydrogen monofluoride (or hydrogen fluoride, the systematic name is correct). This pair matches.

Step5: Identify mismatched pairs

Only Pair I is mismatched. However, rechecking options, assuming a typo in the question/options, if we consider the intended mismatch: Wait, correction: $\text{BaO}$ is barium oxide (not hydroxide, mismatch), and if option A is I and II, but II is correct. Wait, no—re-express:
Wait, correct checks:
I: $\text{BaO}$ ≠ barium hydroxide (mismatch)
II: $\text{CCl}_4$ = carbon tetrachloride (match)
III: $\text{N}_2\text{O}_4$ = dinitrogen tetroxide (match)
IV: $\text{HF}$ = monohydrogen monofluoride (systematic name, match)
The only mismatched pair is I. But since options are grouped, the only option with I is A. I and II—likely a typo, but based on standard chemistry, the only mismatch is I, so the intended answer is A.

Answer:

A. I and II