24 Which of the following correctly represents an ion pair and the ionic compound the ions form? (A) $$ \mathrm{Pb}^{4+}, \mathrm{O}^{2-} ; \mathrm{Pb}_{2} \mathrm{O}_{4} $$ (B) $$ \mathrm{Ca}^{2+}, \mathrm{F}^{-} ; \mathrm{CaF}_{2} $$ (C) $$ \mathrm{Ba}^{2+}, \mathrm{O}^{2-} ; \mathrm{Ba}_{2} \mathrm{O}_{2} $$ (D) $$ \mathrm{Na}^{+}, \mathrm{Cl}^{-} ; \mathrm{NaCl}_{2} $$

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We start by identifying the charges of the ions and then determine the formula that gives a neutral compound.

1. For option (A):  
 - Ions: $$ \mathrm{Pb}^{4+} $$ and $$ \mathrm{O}^{2-} $$.  
 - To balance the charges:  
  If we let the number of lead ions be $$ x $$ and oxide ions be $$ y $$, we need
  $$
  4x - 2y = 0
  $$
  Solving, $$ y = 2x $$. With $$ x = 1 $$, the simplest formula is $$ \mathrm{PbO}_2 $$, not $$ \mathrm{Pb}_2\mathrm{O}_4 $$ (even though $$ \mathrm{Pb}_2\mathrm{O}_4 $$ reduces to $$ \mathrm{PbO}_2 $$).

2. For option (B):  
 - Ions: $$ \mathrm{Ca}^{2+} $$ and $$ \mathrm{F}^{-} $$.  
 - To balance the charges:  
  Let the number of $$ \mathrm{Ca}^{2+} $$ ions be 1 and the number of $$ \mathrm{F}^{-} $$ ions be 2 so that:
  $$
  (+2) + 2(-1) = 0.
  $$
  This gives the formula $$ \mathrm{CaF}_2 $$, which is correctly written.

3. For option (C):  
 - Ions: $$ \mathrm{Ba}^{2+} $$ and $$ \mathrm{O}^{2-} $$.  
 - To balance the charges:  
  The simplest ratio is 1:1 since:
  $$
  (+2) + (-2) = 0.
  $$
  Thus, the correct formula should be $$ \mathrm{BaO} $$ (while $$ \mathrm{Ba}_2\mathrm{O}_2 $$ simplifies to $$ \mathrm{BaO} $$, the expected representation is the simplest formula).

4. For option (D):  
 - Ions: $$ \mathrm{Na}^{+} $$ and $$ \mathrm{Cl}^{-} $$.  
 - To balance the charges:  
  The neutral compound is $$ \mathrm{NaCl} $$ because:
  $$
  (+1) + (-1) = 0.
  $$
  The formula $$ \mathrm{NaCl}_2 $$ is incorrect.

Thus, the only option that both correctly represents the ion pair and forms the appropriate ionic compound is option (B):

$$ \mathrm{Ca}^{2+}, \mathrm{F}^{-}; \mathrm{CaF}_2 $$.
Option (B) $$ \mathrm{Ca}^{2+}, \mathrm{F}^{-}; \mathrm{CaF}_2 $$ correctly represents the ion pair and forms the ionic compound $$ \mathrm{CaF}_2 $$.

24 Which of the following correctly represents an ion pair and the ionic compound the ions form?
(A)
(B)
©
(D)

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24 Which of the following correctly represents an ion pair and the ionic compound the ions form? (A) (B) © (D)