Which of the following is a Lewis base?
a) NH3NH_3NH3
b) BF3BF_3BF3
c) CO2CO_2CO2
d) H2SO4H_2SO_4H2SO4
Answer: a
Which of the following substances will react with water to produce an acidic solution?
a) Na₂O
b) CO2CO_2CO2
c) MgOMgOMgO
d) CaOCaOCaO
Answer: b
The pH of a solution is 5. What is the OH−OH^-OH− concentration?
a) 1×10−91 \times 10^{-9}1×10−9 M
b) 1×10−71 \times 10^{-7}1×10−7 M
c) 1×10−51 \times 10^{-5}1×10−5 M
d) 1×10−141 \times 10^{-14}1×10−14 M
Answer: a
Which of the following is true about a weak acid?
a) It completely ionizes in water
b) It partially ionizes in water
c) It has a very high pH
d) It is a strong electrolyte
Answer: b
What happens to the pH of an acidic solution when it is diluted with water?
a) Increases
b) Decreases
c) Remains unchanged
d) Becomes neutral
Answer: a
Which of the following is a tribasic acid?
a) H3PO4H_3PO_4H3PO4
b) HClHClHCl
c) H2SO4H_2SO_4H2SO4
d) HNO3HNO_3HNO3
Answer: a
Which of the following is a characteristic of a strong base?
a) It has a high KbK_bKb value
b) It has a low KbK_bKb value
c) It partially ionizes in water
d) It forms a weak electrolyte in water
Answer: a
Which of the following salts will form an acidic solution in water?
a) NaCl
b) K2SO4K_2SO_4K2SO4
c) NH4NO3NH_4NO_3NH4NO3
d) NaNO₃
Answer: c
The conjugate base of H2OH_2OH2O is:
a) OH−OH^-OH−
b) H3O+H_3O^+H3O+
c) H2O2H_2O_2H2O2
d) HClHClHCl
Answer: a
Which of the following pairs is an example of a buffer solution?
a) HCl and NaCl
b) CH3COOHCH_3COOHCH3COOH and CH3COONaCH_3COONaCH3COONa
c) H2SO4H_2SO_4H2SO4 and K2SO4K_2SO_4K2SO4
d) NaOH and KOHKOHKOH
Answer: b