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Acids, Bases and Salts Quiz

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Question 1

One red litmus strip

Difficulty: mediumSource: NCERT opening in-text question alignedTopic: indicators-and-neutralisation

Three solutions are an acid, a base and distilled water. Red litmus turns blue in one solution. What should be done next to identify the other two?

1Add phenolphthalein to both2Use the newly blue litmus to test both remaining solutions3Smell both solutions directly4Evaporate both solutions

Question 2

Phenolphthalein clue

Difficulty: easySource: NCERT Activity 2.1 alignedTopic: indicators-and-neutralisation

Phenolphthalein added to a basic solution is usually:

1red2yellow3pink4blue

Question 3

Olfactory indicators

Difficulty: easySource: NCERT Activity 2.2 alignedTopic: indicators-and-neutralisation

Which observation best supports the use of onion as an olfactory indicator?

1Its smell is retained in acid but becomes difficult to detect in base2It turns every acid blue3It produces hydrogen with a base4It changes the pH of the solution to 7

Question 4

Zinc and dilute acid

Difficulty: easySource: NCERT Activity 2.3 alignedTopic: chemical-properties-of-acids-and-bases

Which gas forms when zinc reacts with dilute sulphuric acid, and how is it identified?

1Oxygen; it relights a glowing splint2Carbon dioxide; it turns lime water milky3Chlorine; it bleaches moist litmus4Hydrogen; it burns with a pop

Question 5

Carbonate reaction

Difficulty: easySource: NCERT Activity 2.5 alignedTopic: chemical-properties-of-acids-and-bases

Which complete product set forms when sodium carbonate reacts with dilute hydrochloric acid?

1Sodium chloride, water and carbon dioxide2Sodium hydroxide and chlorine3Sodium chloride and hydrogen4Sodium oxide and water

Question 6

Excess carbon dioxide

Difficulty: hardSource: NCERT Section 2.1.3 alignedTopic: chemical-properties-of-acids-and-bases

Lime water first turns milky and then becomes clear when excess carbon dioxide is passed. Why does it become clear?

1Calcium oxide forms2The carbon dioxide escapes without reacting3Soluble calcium hydrogencarbonate forms4Hydrogen gas dissolves the precipitate

Question 7

Neutralisation at ion level

Difficulty: mediumSource: NCERT Sections 2.1.4 and 2.2.1 alignedTopic: chemical-properties-of-acids-and-bases

Which ionic equation represents neutralisation?

1Na+ + Cl- -> NaCl2H+ + OH- -> H2O3H2O -> H+ + O2-4Ca2+ + CO2 -> CaCO3

Question 8

Nature of oxides

Difficulty: mediumSource: NCERT Activity 2.7 alignedTopic: chemical-properties-of-acids-and-bases

Copper oxide reacts with hydrochloric acid to form copper chloride and water. What does this show?

1Copper oxide is neutral2Hydrochloric acid is a base3Copper chloride is an acid4Copper oxide is basic

Question 9

Hydrogen is present, but no acid

Difficulty: mediumSource: NCERT Activity 2.8 and Exercise 6 alignedTopic: ph-and-ions-in-solution

Why are glucose and alcohol not classified as acids in aqueous solution?

1They do not contain oxygen2They are always solid3They do not produce H+(aq) or H3O+ ions in water4They produce only OH- ions

Question 10

Dry HCl gas

Difficulty: mediumSource: NCERT Activity 2.9 and in-text question alignedTopic: ph-and-ions-in-solution

Dry hydrogen chloride gas does not turn dry blue litmus red because:

1no water is present for hydronium ions to form2dry litmus is already acidic3hydrogen chloride is a base when dry4chlorine removes the litmus colour

Question 11

Safe dilution

Difficulty: mediumSource: NCERT Activity 2.10 and in-text question alignedTopic: ph-and-ions-in-solution

Why must concentrated acid be added slowly to water rather than water being added to concentrated acid?

1Water makes the acid stronger2Acid floats on water3Water stops all ion formation4Dilution releases heat, and sudden local heating can cause splashing and burns

Question 12

Comparing pH

Difficulty: easySource: NCERT pH scale and 2026 board-demand alignedTopic: ph-and-ions-in-solution

Solutions A, B and C have pH 3, 5 and 7. Which has the greatest hydrogen-ion concentration?

1A2B3C4All are equal

Question 13

Acid rain

Difficulty: easySource: NCERT Section 2.3.1 alignedTopic: ph-and-ions-in-solution

Rainwater is called acid rain when its pH is:

1exactly 72above 7.83below 5.64below 7 in every case

Question 14

Tooth-decay mechanism

Difficulty: mediumSource: NCERT Section 2.3.1 alignedTopic: ph-and-ions-in-solution

Which statement gives the best complete explanation for the use of a generally basic toothpaste?

1It adds sugar to the mouth2It neutralises acid and helps keep mouth pH from remaining below 5.53It changes enamel into sodium chloride4It makes all mouth bacteria basic

Question 15

Predicting salt pH

Difficulty: hardSource: NCERT Activity 2.14 alignedTopic: salts-and-daily-life-uses

A salt is formed from a strong acid and a weak base. Its aqueous solution is most likely:

1neutral with pH 72basic with pH above 73always insoluble4acidic with pH below 7

Question 16

Chlor-alkali electrodes

Difficulty: mediumSource: NCERT Section 2.4.3 alignedTopic: salts-and-daily-life-uses

Which pairing is correct during electrolysis of brine?

1Chlorine at the anode and hydrogen at the cathode2Hydrogen at the anode and chlorine at the cathode3Sodium metal at the anode and oxygen at the cathode4Sodium hydroxide gas at both electrodes

Question 17

Heating baking soda

Difficulty: mediumSource: NCERT Section 2.4.3 and in-text question alignedTopic: salts-and-daily-life-uses

Which products form when sodium hydrogencarbonate is heated?

1Sodium hydroxide and hydrogen2Sodium carbonate, water and carbon dioxide3Sodium chloride and oxygen4Sodium carbonate only

Question 18

Washing soda

Difficulty: hardSource: NCERT Section 2.4.3 alignedTopic: salts-and-daily-life-uses

Which formula represents washing soda?

1NaHCO32Na2CO33Na2CO3.10H2O4CaSO4.2H2O

Question 19

Copper sulphate crystals

Difficulty: hardSource: NCERT Activity 2.15 alignedTopic: salts-and-daily-life-uses

Blue copper sulphate crystals turn white on heating and blue again after water is added. What does this show?

1Copper sulphate burns in water2The salt contains fixed water of crystallisation3Water changes copper into copper sulphate4The white sample is calcium sulphate

Question 20

Storing Plaster of Paris

Difficulty: hardSource: NCERT Exercise 13 alignedTopic: ncert-exercises-and-revision

Why should Plaster of Paris be kept in a moisture-proof container?

1Moisture turns it into sodium carbonate2Moisture makes it acidic3Moisture releases chlorine gas4Moisture changes it into hard gypsum before use

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Question 1

One red litmus strip

Difficulty: mediumSource: NCERT opening in-text question alignedTopic: indicators-and-neutralisation

Three solutions are an acid, a base and distilled water. Red litmus turns blue in one solution. What should be done next to identify the other two?

1Add phenolphthalein to both2Use the newly blue litmus to test both remaining solutions3Smell both solutions directly4Evaporate both solutions

Question 2

Phenolphthalein clue

Difficulty: easySource: NCERT Activity 2.1 alignedTopic: indicators-and-neutralisation

Phenolphthalein added to a basic solution is usually:

1red2yellow3pink4blue

Question 3

Olfactory indicators

Difficulty: easySource: NCERT Activity 2.2 alignedTopic: indicators-and-neutralisation

Which observation best supports the use of onion as an olfactory indicator?

1Its smell is retained in acid but becomes difficult to detect in base2It turns every acid blue3It produces hydrogen with a base4It changes the pH of the solution to 7

Question 4

Zinc and dilute acid

Difficulty: easySource: NCERT Activity 2.3 alignedTopic: chemical-properties-of-acids-and-bases

Which gas forms when zinc reacts with dilute sulphuric acid, and how is it identified?

1Oxygen; it relights a glowing splint2Carbon dioxide; it turns lime water milky3Chlorine; it bleaches moist litmus4Hydrogen; it burns with a pop

Question 5

Carbonate reaction

Difficulty: easySource: NCERT Activity 2.5 alignedTopic: chemical-properties-of-acids-and-bases

Which complete product set forms when sodium carbonate reacts with dilute hydrochloric acid?

1Sodium chloride, water and carbon dioxide2Sodium hydroxide and chlorine3Sodium chloride and hydrogen4Sodium oxide and water

Question 6

Excess carbon dioxide

Difficulty: hardSource: NCERT Section 2.1.3 alignedTopic: chemical-properties-of-acids-and-bases

Lime water first turns milky and then becomes clear when excess carbon dioxide is passed. Why does it become clear?

1Calcium oxide forms2The carbon dioxide escapes without reacting3Soluble calcium hydrogencarbonate forms4Hydrogen gas dissolves the precipitate

Question 7

Neutralisation at ion level

Difficulty: mediumSource: NCERT Sections 2.1.4 and 2.2.1 alignedTopic: chemical-properties-of-acids-and-bases

Which ionic equation represents neutralisation?

1Na+ + Cl- -> NaCl2H+ + OH- -> H2O3H2O -> H+ + O2-4Ca2+ + CO2 -> CaCO3

Question 8

Nature of oxides

Difficulty: mediumSource: NCERT Activity 2.7 alignedTopic: chemical-properties-of-acids-and-bases

Copper oxide reacts with hydrochloric acid to form copper chloride and water. What does this show?

1Copper oxide is neutral2Hydrochloric acid is a base3Copper chloride is an acid4Copper oxide is basic

Question 9

Hydrogen is present, but no acid

Difficulty: mediumSource: NCERT Activity 2.8 and Exercise 6 alignedTopic: ph-and-ions-in-solution

Why are glucose and alcohol not classified as acids in aqueous solution?

1They do not contain oxygen2They are always solid3They do not produce H+(aq) or H3O+ ions in water4They produce only OH- ions

Question 10

Dry HCl gas

Difficulty: mediumSource: NCERT Activity 2.9 and in-text question alignedTopic: ph-and-ions-in-solution

Dry hydrogen chloride gas does not turn dry blue litmus red because:

1no water is present for hydronium ions to form2dry litmus is already acidic3hydrogen chloride is a base when dry4chlorine removes the litmus colour

Question 11

Safe dilution

Difficulty: mediumSource: NCERT Activity 2.10 and in-text question alignedTopic: ph-and-ions-in-solution

Why must concentrated acid be added slowly to water rather than water being added to concentrated acid?

1Water makes the acid stronger2Acid floats on water3Water stops all ion formation4Dilution releases heat, and sudden local heating can cause splashing and burns

Question 12

Comparing pH

Difficulty: easySource: NCERT pH scale and 2026 board-demand alignedTopic: ph-and-ions-in-solution

Solutions A, B and C have pH 3, 5 and 7. Which has the greatest hydrogen-ion concentration?

1A2B3C4All are equal

Question 13

Acid rain

Difficulty: easySource: NCERT Section 2.3.1 alignedTopic: ph-and-ions-in-solution

Rainwater is called acid rain when its pH is:

1exactly 72above 7.83below 5.64below 7 in every case

Question 14

Tooth-decay mechanism

Difficulty: mediumSource: NCERT Section 2.3.1 alignedTopic: ph-and-ions-in-solution

Which statement gives the best complete explanation for the use of a generally basic toothpaste?

1It adds sugar to the mouth2It neutralises acid and helps keep mouth pH from remaining below 5.53It changes enamel into sodium chloride4It makes all mouth bacteria basic

Question 15

Predicting salt pH

Difficulty: hardSource: NCERT Activity 2.14 alignedTopic: salts-and-daily-life-uses

A salt is formed from a strong acid and a weak base. Its aqueous solution is most likely:

1neutral with pH 72basic with pH above 73always insoluble4acidic with pH below 7

Question 16

Chlor-alkali electrodes

Difficulty: mediumSource: NCERT Section 2.4.3 alignedTopic: salts-and-daily-life-uses

Which pairing is correct during electrolysis of brine?

1Chlorine at the anode and hydrogen at the cathode2Hydrogen at the anode and chlorine at the cathode3Sodium metal at the anode and oxygen at the cathode4Sodium hydroxide gas at both electrodes

Question 17

Heating baking soda

Difficulty: mediumSource: NCERT Section 2.4.3 and in-text question alignedTopic: salts-and-daily-life-uses

Which products form when sodium hydrogencarbonate is heated?

1Sodium hydroxide and hydrogen2Sodium carbonate, water and carbon dioxide3Sodium chloride and oxygen4Sodium carbonate only

Question 18

Washing soda

Difficulty: hardSource: NCERT Section 2.4.3 alignedTopic: salts-and-daily-life-uses

Which formula represents washing soda?

1NaHCO32Na2CO33Na2CO3.10H2O4CaSO4.2H2O

Question 19

Copper sulphate crystals

Difficulty: hardSource: NCERT Activity 2.15 alignedTopic: salts-and-daily-life-uses

Blue copper sulphate crystals turn white on heating and blue again after water is added. What does this show?

1Copper sulphate burns in water2The salt contains fixed water of crystallisation3Water changes copper into copper sulphate4The white sample is calcium sulphate

Question 20

Storing Plaster of Paris

Difficulty: hardSource: NCERT Exercise 13 alignedTopic: ncert-exercises-and-revision

Why should Plaster of Paris be kept in a moisture-proof container?

1Moisture turns it into sodium carbonate2Moisture makes it acidic3Moisture releases chlorine gas4Moisture changes it into hard gypsum before use

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Acids, Bases and Salts Quiz

Select your answers

One red litmus strip

Phenolphthalein clue

Olfactory indicators

Zinc and dilute acid

Carbonate reaction

Excess carbon dioxide

Neutralisation at ion level

Nature of oxides

Hydrogen is present, but no acid

Dry HCl gas

Safe dilution

Comparing pH

Acid rain

Tooth-decay mechanism

Predicting salt pH

Chlor-alkali electrodes

Heating baking soda

Washing soda

Copper sulphate crystals

Storing Plaster of Paris

Preparing your questions...

Select your answers

One red litmus strip

Phenolphthalein clue

Olfactory indicators

Zinc and dilute acid

Carbonate reaction

Excess carbon dioxide

Neutralisation at ion level

Nature of oxides

Hydrogen is present, but no acid

Dry HCl gas

Safe dilution

Comparing pH

Acid rain

Tooth-decay mechanism

Predicting salt pH

Chlor-alkali electrodes

Heating baking soda

Washing soda

Copper sulphate crystals

Storing Plaster of Paris