Chemistry

Acids and Bases

594 Questions

Acids and bases questions cover the chemical properties, common examples, and theoretical concepts of acidic and basic substances. Topics include identifying proton acceptors, recognizing amphoteric substances, and knowing the sources of everyday organic acids. These foundational chemistry questions are common across SSC, banking, and railways examinations.

Acid and base propertiesOrganic acidsAmphoteric substancesProton donors and acceptorsChemical formulas

Acids and Bases Questions

Multiple choice

Which of the following statements is correct?

  1. AlCl3 exists in trimeric form.

  2. BF3 is a lewis base.

  3. Ga2O3 is acidic oxide.

  4. BBr3 is a colourless gas.

  5. Boric acid is monobasic acid.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Boric Acid is monobasic in nature because it does not donate any proton. In fact, it accepts one OH- ion acting as Lewis acid. B(OH)3 + 2H2O → H3O+ + [ B(OH)4]-

Multiple choice

Which of the following sets represents soft acids only?

  1. Ni(0), Cu(I), Mg(II), Al(III)

  2. Ni(0), Cu(I), Hg(II), Pt(II)

  3. Cu(I), Cu(II), Hg(II), Fe(III)

  4. Ag(I), Au(I), Zn(II), Mg(II)

  5. Li(I), Ca(II), Al(III), Si(IV)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ni(0), Cu(I), Hg(II), Pt(II) : All are soft acids

Multiple choice

Which of the following acids is/are used for preparing TNT and dynamite?

  1. Sulphuric acid
  2. Hydrochloric acid
  3. Nitric acid

  1. Only 1

  2. Only 3

  3. Only 1 and 2

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In an industry, TNT is produced in a three-step process. First, toluene is nitrated with a mixture of sulphuric and nitric acid to produce mononitrotoluene (MNT). The MNT is separated and then renitrated to dinitrotoluene (DNT). In the final step, the DNT is nitrated to trinitrotoluene (TNT) using an anhydrous mixture of nitric acid and oleum. Nitric acid is consumed by the manufacturing process, but the diluted sulphuric acid can be reconcentrated and reused.