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Acids, Bases & Salts

5 Theory-Based MCQ Tests • 10 Questions Each

Instructions

• 5 tests × 10 questions = 50 MCQs.
• Only theory/concept-based questions are included.
• Submit a test to receive your score.
• Correct answers unlock only after entering the password.

Test 1 — Acids, Bases & Indicators

10 questions • 1 mark each

1. Which statement best describes an acid in aqueous solution?

A. It gives hydroxide ionsB. It gives hydronium ionsC. It always gives sodium ionsD. It cannot react with metals

2. What happens to blue litmus in an acidic solution?

A. It turns redB. It turns greenC. It remains blue in every acidD. It turns yellow

3. What happens to red litmus in a basic solution?

A. It turns redB. It turns blueC. It becomes colourlessD. It turns orange

4. Acetic acid is classified as a:

A. Strong acidB. Weak acidC. Strong baseD. Neutral salt

5. Which pair consists of olfactory indicators?

A. Clove oil and vanilla essenceB. NaCl and NaOHC. HCl and H2SO4D. Copper sulphate and zinc sulphate

6. A solution that turns red litmus blue is likely to have a pH:

A. Less than 7B. Equal to 7C. Greater than 7D. Exactly 0

7. A solution that turns blue litmus red is likely to have a pH:

A. Less than 7B. Exactly 7C. Greater than 7D. Exactly 14

8. What ions are formed when hydrogen chloride reacts with water?

A. Only hydroxide ionsB. Hydronium ionsC. Only sodium ionsD. Calcium ions

9. Which substance is basic in nature according to the source?

A. ToothpasteB. Lime juiceC. Acetic acidD. Hydrochloric acid

10. What is the characteristic smell associated with acetic acid?

A. Vinegar-like pungent smellB. Sweet rose-like smellC. OdourlessD. Rotten-egg smell

Correct answers are locked.

Test 2 — Reactions of Acids and Bases

10 questions • 1 mark each

1. What gas is released when acetic acid reacts with sodium hydrogen carbonate?

A. HydrogenB. OxygenC. Carbon dioxideD. Chlorine

2. How is the gas evolved from acetic acid and sodium hydrogen carbonate described?

A. Colourless and odourlessB. Brown and pungentC. Green and odourlessD. Blue and pungent

3. What happens when the carbon dioxide from this reaction is passed through lime water?

A. It turns milkyB. It turns blueC. It becomes acidic redD. No change occurs

4. Why does a burning splinter get extinguished near the reaction mixture of acid and carbonate?

A. Carbon dioxide does not support combustionB. Hydrogen supports combustionC. Oxygen is producedD. Chlorine is produced

5. What type of reaction occurs when an acid reacts with a base?

A. NeutralisationB. CombustionC. PolymerisationD. Crystallisation

6. What are the products of a typical neutralisation reaction?

A. Salt and waterB. Only gasC. Metal and oxygenD. Acid and metal

7. What happens to temperature generally during neutralisation?

A. It increasesB. It always becomes zeroC. It decreases to freezing pointD. It never changes

8. What is observed when acetic acid is mixed with distilled water?

A. A clear colourless solutionB. Two separate layersC. A precipitateD. A gas is always evolved

9. Which acid is identified in tomato in the source?

A. Acetic acidB. Oxalic acidC. Hydrochloric acidD. Methanoic acid

10. Which acid is identified in a bee sting in the source?

A. Methanoic acidB. Oxalic acidC. Tartaric acidD. Citric acid

Correct answers are locked.

Test 3 — pH, Salts & Everyday Applications

10 questions • 1 mark each

1. What does a pH value below 7 indicate?

A. An acidic solutionB. A neutral solutionC. A basic solutionD. A metallic solution

2. What does a pH value above 7 indicate?

A. An acidic solutionB. A basic solutionC. A neutral solutionD. A salt-free solution

3. What does pH 7 represent?

A. Strong acidB. Strong baseC. Neutral solutionD. Weak acid

4. Fresh milk has a pH of about 6. What happens to its pH when it changes into curd?

A. It becomes greater than 7B. It becomes less than 6C. It becomes exactly 7D. It remains unchanged

5. Why are antacids used for indigestion?

A. They increase stomach acidityB. They neutralise excess acidityC. They produce chlorineD. They act as indicators

6. What is the nature of toothpastes according to the source?

A. AcidicB. BasicC. NeutralD. Always strongly acidic

7. Which substance is used as baking soda?

A. Sodium carbonateB. Sodium hydrogen carbonateC. Calcium carbonateD. Sodium chloride

8. Which substance is washing soda?

A. Sodium carbonate decahydrateB. Sodium hydrogen carbonateC. Calcium chlorideD. Hydrochloric acid

9. What is one use of bleaching powder stated in the source?

A. Water sterilisationB. Making curdC. Preparing vinegarD. Removing permanent hardness directly

10. Which substance is used to remove permanent hardness of water?

A. Sodium carbonate decahydrateB. Sodium chlorideC. Acetic acidD. Calcium sulphate

Correct answers are locked.

Test 4 — Hard Water, Soap & Common Salts

10 questions • 1 mark each

1. Hard water mainly contains ions of:

A. Sodium and potassiumB. Calcium and magnesiumC. Hydrogen and chlorineD. Copper and zinc

2. Which salts can be dissolved in water to make it hard?

A. Salts of calcium or magnesiumB. Only sodium saltsC. Only potassium saltsD. Only chloride-free salts

3. Why does soap form scum in hard water?

A. Soap reacts with calcium and magnesium ionsB. Soap reacts with sodium ionsC. Soap evaporatesD. Soap becomes an acid

4. Which water gives better lather with soap?

A. Hard waterB. Soft waterC. Only seawaterD. Only mineral-rich water

5. Which pair of salts was identified as producing good lather with soap?

A. Sodium sulphate and potassium sulphateB. Calcium sulphate and magnesium sulphateC. Calcium chloride and magnesium chlorideD. Calcium sulphate and calcium chloride

6. What is formed when soap reacts with calcium or magnesium ions?

A. An insoluble precipitate/scumB. Hydrogen gasC. Oxygen gasD. A strong acid

7. What is the main raw material in the chloralkali process?

A. Aqueous sodium chlorideB. Calcium carbonateC. Acetic acidD. Copper sulphate

8. What are the products of the chloralkali process?

A. Sodium hydroxide, chlorine and hydrogenB. Calcium hydroxide and oxygenC. Sodium carbonate and carbon dioxideD. Acetic acid and hydrogen

9. Which gas is produced during the reaction of acid with sodium bicarbonate?

A. Carbon dioxideB. HydrogenC. NitrogenD. Chlorine

10. What is the formula of baking soda?

A. NaClB. NaHCO3C. Na2CO3·10H2OD. CaOCl2

Correct answers are locked.

Test 5 — Important Concepts & Laboratory Theory

10 questions • 1 mark each

1. What is an amphoteric oxide?

A. An oxide reacting only with acidsB. An oxide reacting with both acids and basesC. An oxide reacting only with waterD. An oxide that never reacts

2. Which pair of oxides is identified as amphoteric in the source?

A. ZnO and Al2O3B. MgO and CaOC. Na2O and K2OD. CO2 and SO2

3. Why is sodium hydroxide called an alkali?

A. It is soluble in waterB. It is always acidicC. It is insoluble in waterD. It is a neutral salt

4. What is observed when sodium hydroxide dissolves in water?

A. It readily dissolves and the process is exothermicB. It forms an insoluble precipitateC. It produces carbon dioxideD. It becomes acidic

5. What happens when plaster of Paris combines with water?

A. It hardensB. It produces hydrogenC. It becomes a gasD. It turns into sodium chloride

6. What is plaster of Paris prepared from?

A. GypsumB. Common saltC. Baking sodaD. Acetic acid

7. What is the nature of calcium phosphate in tooth enamel?

A. BasicB. AcidicC. NeutralD. Gaseous

8. What is the safest principle stated for an acid spill on the hand?

A. Wash immediately with plenty of waterB. Apply concentrated NaOHC. Ignore itD. Add concentrated acid

9. Which substance is used as a constituent of baking powder along with sodium hydrogen carbonate?

A. Tartaric acidB. Hydrochloric acidC. Sulphuric acidD. Sodium chloride

10. Which acid is described as a weak acid in the source?

A. Acetic acidB. Hydrochloric acidC. Sulphuric acidD. Nitric acid

Correct answers are locked.