Equilibrium

---

Question

---

Question 1 :

The solubility of Ca₃​(PO₄​​)₂​ in water is y mol/L. Its solubility product is

1. 6y²
2. 36 y⁴
3. 64 y⁵
4. 108 y⁵
Answer
8534

Question 2 :

A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?

1. Acetoacetic acid (pK_a = 3.58)
2. m-Chlorobenzoic acid (pK_a = 3.98)
3. p-Chlorocinnamic acid (pK_a = 4.41)
4. 2, 5-Dihydroxy benzoic acid (pK_a = 2.97)
Answer
8535

Question 3 :

Which of the following aqueous solutions will have highest pH?

1. NaCl
2. NH₄Cl
3. Na₂CO₃
4. CH₃COONa
Answer
8536

Question 4 :

What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)₂?

1. 11.7
2. 11.31
3. 13.30
4. None of these
Answer
8537

Question 5 :

Which of the following oxides is not expected to react with sodium hydroxide?

1. CaO
2. SiO₂
3. BeO
4. B₂O₃
Answer
8538