Which of the following statements about the conjugate acids is incorrect?
A. The conjugate acid of NH2OH is NH3+OH.
B. The conjugate acid of H2O is H+.
C. The conjugate acid of (CH2)6N4 is (CH2)6N4H+.
D. The conjugate acid of NH3 is NH4+.
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The pH of mixed solution of 300.0 mL 0.500 mol/L H3PO4 and 400.0 mL 1.00 mol/L NaOH is ?
A. 12.35.
B. 11.10.
C. 11.90.
D. 12.67.
The pH of 0.5 mol/L NaCN is ?
A. 11.45.
B. 5.10.
C. 10.90.
D. 7.40.
Which of the following statements about acid-base reaction is incorrect?
Acid-base reaction is a proton transfer reaction.
B. Substances produced by acid-base reactions are also acid-base.
C. Amphoteric substances can react with acids or bases.
D. Any acid-base reaction can be used for acid-base titration.
Which of the following statements about acid is wrong?
A. The substance that can ionize hydrogen ions in aqueous solution is acid.
B. The substance that can accept protons is acid.
C. The substance that can accept a lone pair of electrons is acid.
D. Acid must contain the hydrogen element.
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