iran-konkur 2023 Q96

iran-konkur · Other · konkur-riazi_1402_tir_specialized Not Maths
96. Which of the following is correct?
A: If the gas-phase concentration of DOH in the solution is $0.1$ molar and its degree of ionization at room temperature is 16, the molar concentration of hydroxide ion in this solution is $6.25 \times 10^{-3}$.
B: The more carbon atoms in the molecule of a non-soap detergent, the greater its solubility in water and its cleaning ability.
C: From dissolving equal moles of $\text{Li}_2\text{O(s)}$ and $\text{N}_2\text{O}_5\text{(g)}$ in $100$ mL of water, a solution with a neutral pH is formed.
D: By increasing the concentration of acidic solution HA at constant temperature, the pH of the solution decreases and the ionization constant of the acid increases.
  1. ``B'' and ``D''
  2. ``P'' and ``D''
  3. ``A'' and ``B''
  4. ``A'' and ``B''

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Space for calculations
%% Page 15 Chemistry 122-A Page 14
\textbf{96.} Which of the following is correct?

\textbf{A:} If the gas-phase concentration of DOH in the solution is $0.1$ molar and its degree of ionization at room temperature is 16, the molar concentration of hydroxide ion in this solution is $6.25 \times 10^{-3}$.

\textbf{B:} The more carbon atoms in the molecule of a non-soap detergent, the greater its solubility in water and its cleaning ability.

\textbf{C:} From dissolving equal moles of $\text{Li}_2\text{O(s)}$ and $\text{N}_2\text{O}_5\text{(g)}$ in $100$ mL of water, a solution with a neutral pH is formed.

\textbf{D:} By increasing the concentration of acidic solution HA at constant temperature, the pH of the solution decreases and the ionization constant of the acid increases.

\begin{enumerate}
\item ``B'' and ``D''
\item ``P'' and ``D''
\item ``A'' and ``B''
\item ``A'' and ``B''
\end{enumerate}

\hrulefill

\begin{center}
\textit{Space for calculations}
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\textbf{Chemistry} \hfill \textbf{122-A} \hfill \textbf{Page 14}

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