Sodium is added to water to form solution Y . The pH of solution Y is measured. When powdered substance $$\(X\)$$ is added to solution $$\(Y\)$$, the pH falls. Which two compounds could each be substance $$\(X\)$$ ?
A.
\(\mathrm{MgCl}_{2}\) and \(\mathrm{Al}(\mathrm{OH})_{3}\)
B.
\(\mathrm{MgCl}_{2}\) and \(\mathrm{K}_{2} \mathrm{O}\)
C.
NaCl and \(\mathrm{Al}(\mathrm{OH})_{3}\)
D.
NaCl and \(\mathrm{K}_{2} \mathrm{O}\)
Exam No：9701_s24_qp_12 Year：2024 Question No：20
Answer:
A
Knowledge points:
4.1.1 explain the origin of pressure in a gas in terms of collisions between gas molecules and the wall of the container
4.1.2 understand that ideal gases have zero particle volume and no intermolecular forces of attraction
4.1.3 state and use the ideal gas equation pV = nRT in calculations, including in the determination of $M_{r}$
Solution:
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