CBSE Class 10 Science Acids Bases and Salts MCQs Set 12

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Chapter-wise Objective Questions: Chapter 02 Acids, Bases and Salts

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This page offers 36 Class 10 Science MCQs on Acids, Bases and Salts, each solved with a short explanation and a Teacher's Note. It tests the pH of salt solutions, the strength of acids and bases, the products of heating limestone and baking soda, and includes passage-based questions on common salt and laboratory safety, together with five assertion-reason questions.

Multiple Choice Questions

Question 1: Indicators are:
(i) Weak acids or weak bases
(ii) Strong acids or strong bases
(iii) They help to find acidic and basic nature of liquids
(iv) Most of them are organic compounds
(a) (i), (ii), (iv)
(b) (i), (iii), (iv)
(c) (ii), (iii), (iv)
(d) (i), (ii), (iii)
Show Answer & Explanation

Answer: (b) (i), (iii), (iv)

Explanation:
1. Indicators are weak acids or weak bases whose colour changes with the medium.
2. They help us find whether a liquid is acidic or basic, and most of them are organic compounds.
3. Strong acids and strong bases are not used as indicators.

Teacher's Note:
1. Examples: litmus, phenolphthalein, methyl orange.
2. Statements (i), (iii) and (iv) are correct.

Question 2: What is the colour of phenolphthalein in ammonium hydroxide?
(a) Colourless
(b) Orange
(c) Yellow
(d) Pink
Show Answer & Explanation

Answer: (d) Pink

Explanation:
1. Ammonium hydroxide is a weak base.
2. Phenolphthalein is colourless in acid and turns pink in a basic solution, so it is pink in NH4OH.

Teacher's Note:
1. Phenolphthalein: pink in base.
2. It is a synthetic indicator.

Question 3: An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
Show Answer & Explanation

Answer: (d) Hydrochloric acid

Explanation:
1. The solution turns red litmus blue, so it is basic.
2. To reverse the change we must make it acidic by adding excess of an acid.
3. HCl is an acid; the other options are bases or basic.

Teacher's Note:
1. Excess acid neutralises the base and then makes the solution acidic.
2. Blue litmus turns red again.

Question 4: Consider the following statements:
P. HCl(g) turns the red litmus blue.
Q. Lactic acid is one of the mineral acids.
R. Milk of Magnesia is a type of milk.
Which of these statement(s) is/are correct?
(a) P and Q
(b) P and R
(c) P, Q, R
(d) All are incorrect
Show Answer & Explanation

Answer: (d) All are incorrect

Explanation:
1. HCl(g) is an acid and does not turn red litmus blue, so P is false.
2. Lactic acid is an organic acid, not a mineral acid, so Q is false.
3. Milk of magnesia is Mg(OH)2 suspension, an antacid, not milk, so R is false.

Teacher's Note:
1. Mineral acids: HCl, H2SO4, HNO3.
2. Organic acids come from living things.

Question 5: Two salts X and Y are dissolved in water separately. When phenolphthalein is added to these two solutions the solution X turns pink and the solution Y does not show any change in colour, therefore X and Y are:
(a) X = Na2CO3, Y = NH4Cl
(b) X = Na2SO4, Y = NaHCO3
(c) X = NH4Cl, Y = Na2SO4
(d) X = NaNO3, Y = Na2SO4
Show Answer & Explanation

Answer: (a) X = Na2CO3, Y = NH4Cl

Explanation:
1. Phenolphthalein turns pink only in a basic solution.
2. Na2CO3 is a salt of a strong base and a weak acid, so it is basic.
3. NH4Cl is acidic, so phenolphthalein stays colourless.

Teacher's Note:
1. Pink means basic.
2. Colourless means acidic or neutral.

Question 6: Of the aqueous solutions listed below, which would be the best conductor of an electric current?
(a) HCl
(b) H3PO4
(c) HOCl
(d) CH3COOH
Show Answer & Explanation

Answer: (a) HCl

Explanation:
1. Better conductivity needs more ions in solution.
2. HCl is a strong acid and ionises completely, so it has the most ions.
3. H3PO4, HOCl and CH3COOH are weak acids.

Teacher's Note:
1. Strong electrolytes conduct better.
2. Concentration being the same, compare the degree of ionisation.

Question 7: Which of the following will conduct electricity?
(a) Glucose solution
(b) Ethanol solution
(c) Acetic acid solution
(d) Dry HCl(g)
Show Answer & Explanation

Answer: (c) Acetic acid solution

Explanation:
1. Acetic acid gives H+ and CH3COO– ions in water, so its solution conducts.
2. Glucose and ethanol solutions have no ions, and dry HCl gas has no ions either.

Teacher's Note:
1. Ions are needed to carry current.
2. Dry HCl gas is not ionised.

Question 8: Ammonium hydroxide is a weak base because
(a) it has low vapour pressure
(b) it is only slightly ionised
(c) it is not a hydroxide of any metal
(d) it has low density
Show Answer & Explanation

Answer: (b) it is only slightly ionised

Explanation:
1. NH4OH ionises only slightly in water.
2. Few OH– ions are formed, so it is a weak base.

Teacher's Note:
1. Strength depends on the extent of ionisation.
2. Density or vapour pressure has nothing to do with it.

Question 9: Which of the following reaction does not result in the evolution of H2 gas?
(a) dilute sulphuric acid reacts with zinc granules.
(b) dilute hydrochloric acid reacts with magnesium ribbon.
(c) dilute sulphuric acid reacts with aluminium powder.
(d) dilute hydrochloric acid with dilute sodium hydroxide solution.
Show Answer & Explanation

Answer: (d) dilute hydrochloric acid with dilute sodium hydroxide solution.

Explanation:
1. Metals react with acids to give hydrogen: Zn, Mg and Al in options (a), (b), (c).
2. Dilute HCl with NaOH is a neutralisation reaction giving NaCl and water; no H2 is formed.

Teacher's Note:
1. Acid + base gives salt + water.
2. Acid + metal gives salt + hydrogen.

Question 10: Baking powder is a mixture of:
(a) Sodium carbonate and acetic acid
(b) Sodium carbonate and tartaric acid
(c) Sodium hydrogen carbonate and tartaric acid
(d) Sodium hydrogen carbonate and acetic acid
Show Answer & Explanation

Answer: (c) Sodium hydrogen carbonate and tartaric acid

Explanation:
1. Baking powder is a mixture of baking soda (sodium hydrogencarbonate) and tartaric acid.
2. On heating or adding water the two react and release CO2.

Teacher's Note:
1. Baking soda alone is only NaHCO3.
2. Tartaric acid is a mild edible acid.

Question 11: In an attempt to demonstrate electrical conductivity through an electrolyte, the apparatus shown in the figure (a 6 volt battery, a bulb and a switch connected to two nails fixed on a rubber cork and dipped in dilute NaOH solution in a beaker) was set up. Which among the following statement(s) is(are) correct?
(i) Bulb will not glow because electrolyte is not acidic
(ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
(iii) Bulb will not glow because circuit is incomplete.
(iv) Bulb will not glow because it depends upon the type of electrolytic solution.
6 volt battery Bulb Switch Beaker Dilute NaOH solution Nail Rubber cork (a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only
Show Answer & Explanation

Answer: (c) (ii) only

Explanation:
1. The figure shows a complete circuit: battery, bulb, switch and two nails dipped in the solution, so statement (iii) is false.
2. NaOH is a strong base and ionises completely into Na+ and OH– ions, which carry the current, so the bulb glows; statement (ii) is correct.
3. Statements (i) and (iv) are wrong because bases also conduct electricity, and the type of electrolyte does not stop conduction.

Teacher's Note:
1. A circuit with ions in solution allows current to flow.
2. Both acids and bases conduct because they form ions.

Question 12: Egg shell is made up of
(a) CaCO3
(b) CaO
(c) Ca(OH)2
(d) CaCl2
Show Answer & Explanation

Answer: (a) CaCO3

Explanation:
1. Egg shells are made of calcium carbonate, CaCO3.
2. They give CO2 with dilute HCl.

Teacher's Note:
1. Marble, chalk and limestone are also CaCO3.
2. Test the gas with lime water.

Question 13: Match the pH values with the solutions:
Column-I (pH value)Column-II (Solution)
(P) 6.5 to 6.71. Vinegar
(Q) 7.42. Milk
(R) 2.4 – 3.43. Human blood
(S) 12.44. Lime water

(a) P–1, Q–1, R–2, S–3
(b) P–1, Q–2, R–3, S–4
(c) P–2, Q–3, R–1, S–4
(d) P–3, Q–4, R–1, S–2
Show Answer & Explanation

Answer: (c) P–2, Q–3, R–1, S–4

Explanation:
1. Milk has pH 6.5–6.7, so P–2.
2. Human blood has pH 7.4, so Q–3.
3. Vinegar has pH 2.4–3.4, so R–1, and lime water has pH 12.4, so S–4.

Teacher's Note:
1. Memorise typical pH values.
2. Blood is slightly basic.

Question 14: Identify the product ‘X’ obtained in the following chemical reaction: CaCO3 → ‘X’ + CO2 (on heating)
(a) Quick lime
(b) Gypsum
(c) Lime stone
(d) Plaster of Paris
Show Answer & Explanation

Answer: (a) Quick lime

Explanation:
1. Heating CaCO3 causes thermal decomposition: CaCO3 → CaO + CO2.
2. CaO is quicklime.

Teacher's Note:
1. Limestone is not a product here; it is the reactant.
2. This reaction is used in making cement and lime.

Question 15: Equal volumes of solutions containing 1 mole of an acid and 1 mole of a base respectively are mixed. Which of these mixtures will give pH more than 7?
(a) Sodium hydroxide + Acetic acid
(b) Potassium hydroxide + Sulphuric acid
(c) Ammonium hydroxide + Sulphuric acid
(d) Sodium hydroxide + Hydrochloric acid
Show Answer & Explanation

Answer: (a) Sodium hydroxide + Acetic acid

Explanation:
1. 1 mole of NaOH with 1 mole of CH3COOH gives sodium acetate, a salt of a strong base and a weak acid.
2. Its solution is basic, with pH above 7.
3. The other mixtures are acidic (H2SO4 left over) or neutral (NaOH + HCl).

Teacher's Note:
1. Strong base + weak acid gives a basic salt.
2. Strong acid + strong base gives a neutral salt.

Question 16: An aqueous solution with pH = 1 is
(a) strongly acidic
(b) strongly basic
(c) neutral
(d) weakly acidic
Show Answer & Explanation

Answer: (a) strongly acidic

Explanation:
1. A pH of 1 is far below 7.
2. It denotes a solution with a very high H+ concentration, strongly acidic.

Teacher's Note:
1. pH 0–3: strongly acidic.
2. pH 7: neutral.

Question 17: Sonia has aqueous solutions of three salts, sodium acetate, sodium chloride and ammonium chloride, in three unlabelled test tubes. On checking, she finds the pH of the solutions to be 4.6, 7.0 and 8.9. Which of the following correctly matches the salts with their respective pH?
(a) pH 4.6: sodium acetate; pH 7.0: sodium chloride; pH 8.9: ammonium chloride
(b) pH 4.6: sodium chloride; pH 7.0: ammonium chloride; pH 8.9: sodium acetate
(c) pH 4.6: ammonium chloride; pH 7.0: sodium acetate; pH 8.9: sodium chloride
(d) pH 4.6: ammonium chloride; pH 7.0: sodium chloride; pH 8.9: sodium acetate
Show Answer & Explanation

Answer: (d) pH 4.6: ammonium chloride; pH 7.0: sodium chloride; pH 8.9: sodium acetate

Explanation:
1. Sodium acetate is a salt of a strong base and a weak acid, so it is basic (pH 8.9).
2. Sodium chloride is a salt of a strong acid and a strong base, so it is neutral (pH 7.0).
3. Ammonium chloride is a salt of a strong acid and a weak base, so it is acidic (pH 4.6).

Teacher's Note:
1. Apply the rule for the pH of salts.
2. Match pH 4.6 with NH4Cl.

Question 18: pH of pure water is
(a) 7
(b) 8
(c) 9
(d) 10
Show Answer & Explanation

Answer: (a) 7

Explanation:
1. Pure water is neutral because [H+] = [OH–].
2. Its pH is 7.

Teacher's Note:
1. pH 7 is neutral at room temperature.
2. Acids lower the pH, bases raise it.

Question 19: The correct order of increasing pH values of the aqueous solutions of baking soda, rock salt, washing soda and slaked lime is
(a) Baking Soda < Rock Salt < Washing Soda < Slaked lime
(b) Rock Salt < Baking Soda < Washing Soda < Slaked lime
(c) Slaked lime < Washing Soda < Rock Salt < Baking Soda
(d) Washing Soda < Baking Soda < Rock Salt < Slaked lime
Show Answer & Explanation

Answer: (b) Rock Salt < Baking Soda < Washing Soda < Slaked lime

Explanation:
1. Rock salt (NaCl) is neutral, pH 7.
2. Baking soda (NaHCO3) is mildly basic, washing soda (Na2CO3) is more basic and slaked lime Ca(OH)2 is strongly basic.
3. So the increasing order is rock salt < baking soda < washing soda < slaked lime.

Teacher's Note:
1. Stronger base means higher pH.
2. Learn this order for pH of common salts.

Question 20: When pH paper is put in distilled water its colour changes to green. Then some common salt is added to water and pH paper is tested in this solution. Now the colour of pH paper in this case is:
(a) Green
(b) Pink
(c) Red
(d) Blue
Show Answer & Explanation

Answer: (a) Green

Explanation:
1. Distilled water and common salt solution are both neutral.
2. NaCl is a salt of a strong acid and a strong base, so it does not change the pH.
3. The pH paper stays green.

Teacher's Note:
1. Green on pH paper means pH 7.
2. Neutral salts do not change the pH of water.

Question 21: Which of the following is not an acidic salt?
(a) CuSO4
(b) NH4Cl
(c) FeCl3
(d) CH3COONa
Show Answer & Explanation

Answer: (d) CH3COONa

Explanation:
1. CuSO4, NH4Cl and FeCl3 are salts of strong acids with weak bases, so they are acidic.
2. CH3COONa is a salt of a weak acid and a strong base, so it is basic, not acidic.

Teacher's Note:
1. Strong acid + weak base gives an acidic salt.
2. Strong base + weak acid gives a basic salt.

Question 22: Select washing soda from the following:
(a) NaHCO3
(b) Na2CO3·5H2O
(c) Na2CO3·10H2O
(d) NaOH
Show Answer & Explanation

Answer: (c) Na2CO3·10H2O

Explanation:
1. Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O.
2. NaHCO3 is baking soda and NaOH is caustic soda.

Teacher's Note:
1. It is obtained by recrystallisation of sodium carbonate.
2. It is used to soften hard water.

Question 23: Common edible salt, NaCl (sodium chloride), obtained from seawater or from lakes contains many impurities such as sulphates of sodium and magnesium along with chlorides of calcium and magnesium. The chlorides of these metals are particularly undesirable being deliquescent in nature. A saturated solution of salt in a minimum quantity of water is prepared and insoluble impurities are filtered off. HCl gas is then passed through the saturated solution and the crystals of pure NaCl separate out. The soluble impurities remain in the solution. Pure crystals of NaCl are filtered, washed and dried.
Choose the correct statement:
(a) Pure NaCl is hygroscopic in nature by itself
(b) Pure NaCl is soluble in alcohol
(c) NaCl shows hygroscopic properties only due to impurities
(d) NaCl is a brown crystalline solid
Show Answer & Explanation

Answer: (c) NaCl shows hygroscopic properties only due to impurities

Explanation:
1. Pure NaCl is not hygroscopic.
2. Impurities such as MgCl2 and CaCl2 are deliquescent and absorb moisture, so common salt becomes damp.
3. So statement (c) is correct.

Teacher's Note:
1. Pure NaCl is a white crystalline solid, soluble in water.
2. Purification removes the deliquescent impurities.

Question 24: Nature of the aqueous solution of common salt is:
(Refer to the passage given with Question 23.)
(a) Acidic
(b) Alkaline
(c) Basic
(d) Neutral
Show Answer & Explanation

Answer: (d) Neutral

Explanation:
1. NaCl is a salt of a strong acid (HCl) and a strong base (NaOH).
2. Its aqueous solution is therefore neutral.

Teacher's Note:
1. Neutral salt: pH = 7.
2. Table salt does not change the colour of litmus.

Question 25: Which of the following compounds is alkaline in an aqueous medium?
(Refer to the passage given with Question 23.)
(a) Na2CO3
(b) NaCl
(c) H2CO3
(d) CuSO4
Show Answer & Explanation

Answer: (a) Na2CO3

Explanation:
1. Na2CO3 is a salt of a strong base and a weak acid, so its solution is alkaline.
2. NaCl is neutral, H2CO3 is acidic and CuSO4 is acidic in solution.

Teacher's Note:
1. Alkaline: pH more than 7.
2. Washing soda is alkaline.

Question 26: Adding common salt to water will result in:
(Refer to the passage given with Question 23.)
(a) increase in pH of the water
(b) decrease in pH of the water
(c) no change in pH of the water
(d) Flames in water
Show Answer & Explanation

Answer: (c) no change in pH of the water

Explanation:
1. NaCl does not react with water to give acid or base.
2. Hence adding common salt leaves the pH unchanged.

Teacher's Note:
1. Neutral salts do not change the pH of water.
2. The pH stays at 7.

Question 27: Examine few statements regarding NaCl.
I. It is made by the chlor-alkali process
II. It is a white crystalline substance
III. It also exists in the form of rocks called rock salt
IV. It is a neutral salt with a pH value = 7
(Refer to the passage given with Question 23.)
(a) II and III only
(b) III and IV only
(c) I and IV only
(d) II, III and IV only
Show Answer & Explanation

Answer: (d) II, III and IV only

Explanation:
1. NaCl is a white crystalline substance (II), is found as rock salt (III) and is neutral with pH 7 (IV).
2. It is not made by the chlor-alkali process; it is the raw material for that process, so statement I is false.

Teacher's Note:
1. Chlor-alkali process uses NaCl to make NaOH, Cl2 and H2.
2. Brine is the NaCl solution.

Question 28: Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acid and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.
What could be the possible liquid present in the test tube?
(a) Boiling water
(b) Concentrated H2SO4
(c) Vinegar
(d) Sodium Hydroxide Solution
Show Answer & Explanation

Answer: (b) Concentrated H2SO4

Explanation:
1. A liquid that blisters the skin and turns pH paper red is strongly acidic and corrosive.
2. Concentrated H2SO4 fits; boiling water is neutral, vinegar is a weak acid, and NaOH is basic.

Teacher's Note:
1. Handle concentrated acids carefully.
2. Wash with plenty of water after contact.

Question 29: The following list includes the possible first aid for laboratory accidents.
1. Thoroughly rinse the affected area with water.
2. Having medicines without prescribing the doctor.
3. Consult the doctor immediately
4. To go outside the lab, preferably in an open area.
5. Not telling the teacher and other elders or they might scold you.
(Refer to the passage given with Question 28.)
(a) All of the above
(b) 1, 2 and 3 are correct
(c) Only 1 is correct
(d) 1, 3 and 4 are correct
Show Answer & Explanation

Answer: (d) 1, 3 and 4 are correct

Explanation:
1. First aid for an acid burn is to rinse the area with plenty of water (1).
2. Consult a doctor at once (3) and move to open air (4).
3. Taking medicines without a prescription (2) or hiding the accident (5) is wrong.

Teacher's Note:
1. Always inform the teacher immediately.
2. Do not self-medicate.

Question 30: Sodium chloride is used as one of the raw materials in the production of baking soda. Baking soda is commonly used to make crispy pakoras, etc., in the kitchen. It is also added for faster cooking. It is also used in the preparation of effervescent drinks and fruit salts.
The chemical name of baking soda is
(a) sodium hydrogen carbonate
(b) sodium hydroxide
(c) sodium carbonate decahydrate
(d) calcium oxychloride
Show Answer & Explanation

Answer: (a) sodium hydrogen carbonate

Explanation:
1. The compound used in kitchens to make pakoras crispy and in baking soda is sodium hydrogencarbonate.
2. Its formula is NaHCO3.

Teacher's Note:
1. Common name: baking soda.
2. Do not confuse it with washing soda.

Question 31: Which of the following statements is correct regarding properties of baking soda?
(Refer to the passage given with Question 30.)
(a) It is a yellow crystalline substance.
(b) It is non-corrosive in nature.
(c) It reacts with acids evolving hydrogen gas.
(d) All are correct
Show Answer & Explanation

Answer: (b) It is non-corrosive in nature.

Explanation:
1. Baking soda is a white crystalline solid, not yellow.
2. It is non-corrosive and mildly basic.
3. It reacts with acids to evolve carbon dioxide, not hydrogen.

Teacher's Note:
1. Only statement (b) is correct.
2. Check each option separately.

Assertion–Reason Questions

Question 32:
Assertion (A): Ammonia is a base.
Reason (R): It does not contain OH– ions.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Explanation:
1. Ammonia is a base: it accepts H+ from water to form NH4+ and OH–.
2. Ammonia itself does not contain OH– ions, which is also true.
3. But this fact does not explain why it is a base.

Teacher's Note:
1. Both A and R are true; R is not the explanation.
2. The base character comes from the OH– formed in water.

Question 33:
Assertion (A): Dry HCl gas does not change the colour of the dry litmus paper.
Reason (R): It is because dry HCl does not contain the OH– ions.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. Dry HCl gas does not change the colour of dry litmus paper, so the assertion is true.
2. The reason is that there are no H+ ions without water, not that OH– ions are absent.
3. So the reason is false.

Teacher's Note:
1. Litmus changes colour due to H+ ions.
2. HCl produces H+ only in water.

Question 34:
Assertion (A): pH of ammonium chloride solution is in acidic range.
Reason (R): Solution of a salt of weak base and strong acid is acidic.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. NH4Cl is a salt of a strong acid (HCl) and a weak base (NH4OH).
2. Such a salt gives an acidic solution, so both statements are true and the reason explains the assertion.

Teacher's Note:
1. Salt of strong acid + weak base: pH below 7.
2. NH4Cl solution turns blue litmus red.

Question 35:
Assertion (A): Magnesium hydroxide is used as antacid.
Reason (R): Magnesium hydroxide is a strong base.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. Magnesium hydroxide is used as an antacid, so the assertion is true.
2. It is a mild (weak) base, not a strong base, so the reason is false.

Teacher's Note:
1. Antacids are mild bases.
2. A strong base would harm the stomach lining.

Question 36:
Assertion (A): Baking soda does not create acidity in the stomach.
Reason (R): Baking soda is not alkaline.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (c) A is true, but R is false.

Explanation:
1. Baking soda is alkaline and neutralises excess acid in the stomach, so it does not create acidity; the assertion is true.
2. The reason says it is not alkaline, which is false.

Teacher's Note:
1. NaHCO3 is a mild base.
2. It is used as an antacid.

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