321. _ solvent is leveling for acids:
A. Protophilic
B. Protogenic
C. Protonic
D. Acidic
322. An aqueous solution of 1M NaCl and 1M HCl is:
A. Buffer with pH < 7 B. Buffer with pH > 7
C. Not a buffer, but pH < 7
D. Not a buffer, but pH > 7
323. The sum of pH and pOH above 25 degrees Celsius is:
A. Equal to 14
B. Less than 14
C. Greater than 14
D. All are possible
324. The pH of a 0.1 M solution of acid HX is 3. The value of Ka of this acid is approximately equal to:
A. 10⁻⁷
B. 10⁻³
C. 10⁻⁵
D. 3 * 10⁻¹
325. How many liters of water should be added to one liter of an aqueous solution of HCl with a pH = 1; to create an aqueous solution of pH- 2:
A. 1 L
B. 0.1 L
C. 10 L
D. 9 L
326. Which of the following is not a buffer solution:
A. H₂S and KHS
B. H₂CO₃ and KHCO₃
C. NH₃ AND NH₄Cl
D. KClO₄ AND HClO₄
327. A solution of 0.1 NH₄OH and 0.1 M NH₄Cl has pH 9.25. The pKB for NH₄OH is:
A. 9.25
B. 10
C. 4.75
D. 8.25
328. To prepare a buffer solution of pH = 6. The Sodium acetate and acetic acid must be mixed in the ratio of their concentrations (Ka = 10⁻⁵):
A. 1: 10
B. 10: 1
C. 100:1
D. 1:100
329. Ratio of C:Si in their neutron ratio with atomic weight having 12 and 28 respectively?
A. 2:3
B. 5:6
C. 3:7
D. None of the above
330. The EAN value of Ni(CO)₄ is?
A. 72
B. 54
C. 36
D. 31
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