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
  1. Diacetyl morphine

  2. Triacetyl morphine

  3. Tetra acetyl morphine

  4. Monoacetyl morphine

  5. Penta acetyl morphine

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heroin (diacetylmorphine) is synthesized from morphine by acetylation with acetic anhydride, resulting in two acetyl groups attached to the morphine structure. The chemical name diacetyl morphine accurately describes this modification.

Multiple choice
  1. -COO

  2. -COOH

  3. -OH

  4. none of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The carboxylic acid functional group is -COOH, consisting of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom. Option A (-COO) represents a carboxylate ion, option C (-OH) is just a hydroxyl group, and option D is incorrect since option B is valid.

Multiple choice
  1. Carbonic acid

  2. Tartaric acid

  3. Oxalic acid

  4. Citric acid

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lemons contain citric acid, which gives them their characteristic sour taste. Citric acid is a weak organic acid found naturally in citrus fruits like lemons, limes, oranges, and grapefruits. Carbonic acid is in carbonated drinks, tartaric acid is in grapes/tamarind, and oxalic acid is in spinach/rhubarb.

Multiple choice
  1. H2SO5

  2. H2S2O5

  3. H2S3O5

  4. H2SO4

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Caro's acid (peroxymonosulfuric acid) has the formula H2SO5, containing a peroxide linkage (-O-O-). It is a powerful oxidizing agent used in organic synthesis and industrial processes.

Multiple choice
  1. H2S3O8

  2. H2S2O8

  3. H3S2O8

  4. H2S8O3

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Marshall's acid (peroxodisulfuric acid) has the formula H2S2O8. It contains two sulfur atoms each in +6 oxidation state, linked by a peroxide bridge. It is a strong oxidizing agent.

Multiple choice
  1. Sodium bicarbonate

  2. Sulphuric acid

  3. Sodium carbonate

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This question asks for the chemical name of sulphuric acid (H2SO4). The correct answer is B - sulphuric acid itself, as it's asking for the name, not a different compound. Option A (sodium bicarbonate) is baking soda, and option C (sodium carbonate) is washing soda. Option D is incorrect since B is valid.

Multiple choice
  1. Acetyl Acetate

  2. Cobalt Oxide

  3. Acetylic Acid

  4. Acetyl Salicyclic Acid

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aspirin's chemical name is Acetyl Salicyclic Acid (Acetylsalicylic acid). It is a widely used pain reliever, fever reducer, and anti-inflammatory medication. Acetyl Acetate and Cobalt Oxide are different compounds, and 'Acetylic Acid' appears to be a misspelling.

Multiple choice
  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. All of above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sulfuric acid is the electrolyte in lead-acid batteries. The chemical reaction between lead dioxide and sponge lead plates with sulfuric acid generates electrical energy. Hydrochloric and nitric acids would react differently and damage the battery.

Multiple choice
  1. KOH

  2. CaO(HO)2

  3. NaOH

  4. NH4OH

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Weak bases do not ionise completely in an aqueous solution. Ammonium hydroxide also does not completely ionise in the medium. Hence, it is a weak base.

Multiple choice
  1. molecules only

  2. ions and molecules

  3. ions only

  4. neither ions nor molecules

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Strong acids are those which ionis completely in the medium. Because of complete ionisation they give ions only in the medium.e.g.HCl, HNO3, H2SO4 etc.