MCQs For Class 10 Science Chapter 2 Acids, Bases and Salts

Students can refer to the following Acids Bases and Salts MCQ Questions for Class 10 with Answers provided below based on the latest curriculum and examination pattern issued by CBSE and NCERT. Our teachers have provided here a collection of multiple choice questions for Acids Bases and Salts Class 10 covering all topics in your textbook so that students can assess themselves on all important topics and thoroughly prepare for their exams

Acids Bases and Salts MCQ Questions for Class 10 Chemistry with Answers

We have provided below Acids Bases and Salts MCQ Questions for Class 10 with answers which will help the students to go through the entire syllabus and practice multiple choice questions provided here with solutions. As Acids, Bases and Salts MCQs for Class 10 Science pdf download can be really scoring for students, you should go through all problems provided below so that you are able to get more marks in your exams.

Acids Bases and Salts MCQ Questions for Class 10

Question. Why does dry HCl gas not change the colour of the dry litmus paper? 
a. Blue litmus becomes dry in presence of dry HCl gas
b. No H₃O+ ions will be present, litmus changes colour only in the presence of H₃O+ ions
c. HCl gas acts asa dehydrating agent
d. None of the above

Question. How is the concentration of hydronium ions (H₃O+) affected when a solution of an acid is diluted? 
a. Increases
b. Decreases
c. Remains the same
d. Becomes zero

Question. Which of the following is a dibasic acid ?   
(1) HCla
(2) H₃PO₄
(3) HNO₃
(4) H₂SO₄

Question. When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is that   
(1) the surface of the metal turns shining
(2) the reaction mixture turns milky
(3) odour of chlorine is observed
(4) a colourless and odourless gas is evolved with bubbles 18. The reaction of metal with acid results in the formation of 

Question. Which of the following is incorrectly matched ? 
(1) Tomato – tartaric acid
(2) Ant sting – citric acid
(3) Citrus fruit – citric acid
(4) Curd – lactic acid

Question. Two solution A and B were found to have pH value of 6 and 8 respectively. The inference which can be drawn is that   
(1) the acid strength of the solution B is higher than that of A
(2) A is an acid while B is a base
(3) Both are acidic solutions
(4) Both are basic solutions

Question. Which of the following statements is true regarding acids and bases ? 
(1) Acid and bases don’t react with each other
(2) Acids mixed with bases neutralise each other
(3) Acids mixed with bases make stronger acids
(4) Acids mixed with bases make stronger bases

Question. Slaked lime is prepared by adding water to   
(1) bleaching powder
(2) lime water
(3) milk of lime
(4) quicklime

Question. Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that   
(1) solid X is sodium hydroxide and the gas evolved is CO₂
(2) solid X is sodium bicarbonate and the gas evolved is CO₂
(3) solid X is sodium acetate and the gas evolved is CO₂
(4) solid X is sodium chloride and the gas evolved is CO₂

Question. Which of the following is not basic in nature ? 
(1) KOH
(2) ZnO
(3) Al(OH)3
(4) NaCl

Question. Which of the following is a strong acid ?   
(1) Lactic acid
(2) Ascorbic acid
(3) Sulphuric acid
(4) Formic acid

_{Question. Plaster of Paris (CaSO4 . 1/2HO) on mixing with water sets to form}
(1) CaSO4.H2O
(2) (CaSO4 . 1×1/2HO)
(3) CaSO4.2H2O
(4) CaSO4 . 2×1/2HO

Question. Plaster of Paris hardens by   
(1) giving off CO2
(2) changing into CaCO3
(3) combining with water
(4) giving out water

Question. Which of the following is the weakest base ? 
(1) NaOH
(2) Ca(OH)2
(3) NH4OH
(4) KOH

Question. The equation between an acid and a base is XOH + HY →XY + H2O Which of the following is the cation part of salt ? 
(1) X
(2) OH
(3) H
(4) Y

Question. To prevent tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is   
(1) acidic
(2) neutral
(3) basic
(4) corrosive

Question. Phenolphthalein is   
(1) yellow in acidic medium, pink in basic medium
(2) pink in acidic medium, colourless in basic medium
(3) colourless in acidic medium, pink in basic medium
(4) pink in acidic medium, yellow in basic medium

Question. Which gas is evolved when acids react with metal carbonates ?   
(1) CO₂
(2) H₂
(3) NH₃
(4) O₂

_{Question. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains 
(1) NaCl
(2) HCl
(3) LiCl
(4) KCl}

_{Question. Which acids are highly corrosive in nature?}
(1) Acetic acid and oxalic acid
(2) Acetic acid and sulphuric acid
(3) Sulphuric acid and nitric acid
(4) Carbonic acid and acetic acid

Question. When sodium chloride reacts with sulphuric acid, a gas is evolved which gives dense white fumes with ammonia. Which gas is evolved?
(1) HCl
(2) NH4Cl
(3) NH4OH
(4) (NH₄)₂SO₄

Question. For dilution of concentrated acid we should add 
(1) water into concentrated acid
(2) concentrated acid into water
(3) first water into acid and then more acid
(4) Both (1) and (2) are correct

Question. Soda-acid fire extinguisher extinguishes the fire by
(1) cutting the supply of air
(2) removing the combustible substance
(3) raising the ignition temperature
(4) None of these

Question. Plaster of Paris is obtained 
(1) by adding water to calcium sulphate
(2) by adding sulphuric acid to calcium hydroxide
(3) by heating gypsum to a very high temperature
(4) by cooling gypsum

Question. The acid used in making of vinegar is   
(1) formic acid
(2) acetic acid
(3) sulphuric acid
(4) nitric acid

Question. On electrolysis of brine solution, the products formed are 
(1) sodium and chlorine
(2) hydrogen, chlorine and oxygen
(3) hydrogen, chlorine and sodium hydroxide
(4) sodium hydroxide, chlorine and oxygen

Question. Bleaching powder gives smell of chlorine because it – 
(1) is unstable
(2) gives chlorine on exposure to atmosphere
(3) is a mixture of chlorine and slaked lime
(4) contains excess of chlorine

Question. Identify the basic salt from the following salts:         
(a) Na2CO3
(d) NH4Cl
(c) NaNO3
(d) KCl

Question. Common salt besides being used in kitchen can also be used as the raw material for making:         
(i) Washing soda (ii) Bleaching powder
(iii) Baking soda (iv) Slaked lime
(a) (i) and (ii)
(b) (i), (ii) and (iv)
(c) (i) and (iii)
(d) (i), (iii) and (iv)

Question. Which of the following substances will not give carbon dioxide on treatment with dilute acid?   
(a) Marble
(b) Limestone
(c) Baking soda
(d) Lime

Question. Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide in the figure given below).   
(a) Red
(b) Yellow
(c) Yellowish green
(d) Blue

Question. Which of the following phenomena occur, when a small amount of acid is added to water? 
(i) Ionisation (ii) Neutralisation
(iii) Dilution (iv) Salt formation
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

Question. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue:   
(a) Lemon juice
(b) Vinegar
(c) Common salt
(d) An antacid

Question. Sodium carbonate is a basic salt because it is a salt of:   
(a) Strong acid and strong base
(b) Weak acid and weak base
(c) Strong acid and weak base
(d) Weak acid and strong base

Question. Calcium phosphate is present in tooth enamel. Its nature is:     
(a) Basic
(b) Acidic
(c) Neutral
(d) Amphoteric

Question. Which one of the following can be used as an acid-base indicator by a visually impaired student?   
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves

Question. Which of the following substances will not give carbon dioxide on treatment with dilute acid? 
(a) Marble
(b) Limestone
(c) Baking soda
(d) Lime

Question. The colour of neutral litmus solution is
(a) Red
(b) Blue
(c) Purple
(d) Yellow

Question. Which one of the following statements is correct about universal indicator?
(a) It is a mixture of HCl and NaOH
(b) It is a mixture of many indicators
(c) It is a solution of phenolphthalein in alcohol
(d) It is a solution of phenolphthalein in water.

Question. Which of the following properties are shown by dilute HCl?
(i) It turns blue litmus red
(ii) It turns red litmus blue
(iii) It reacts with zinc and a gas is evolved
(iv) It reacts with solid sodium carbonate to give brisk effervescence
(a) 1 and 2
(b) 1 and 3
(c) 1, 3 and 4
(d) 2, 3 and 4

Question. When a drop of unknown solution X is placed on a strip of pH paper, a deep red colour is produced. This sample is which one of these?
(a) NaOH
(b) HCl
(c) Water
(d) CH₃COOH

Question. A student tests a sample drinking water and reports its pH value as 6 at room temperature. Which one of the following might have been added in water?
(a) Calcium chloride
(b) Sodium chloride
(c) Sodium bicarbonate
(d) Bleaching powder

Question. If an unknown solution turns blue litmus red, then the pH of the solution is more likely to be
(a) 12
(b) 10
(c) 7
(d) 4

Question. What is the pH of a 0.00001 molar HCl solution?
(a) 1
(b) 9
(c) 5
(d) 4

Question. Solid sodium bicarbonate was placed on a strip of pH paper. The color of the strip
(a) turned red
(b) did not change
(c) turned green and slightly yellow
(d) turned pink

Question. Four drops of red litmus solution were added to each of the following samples. Which one turns red litmus blue?
(a) Alcohol
(b) Distilled water
(c) Sodium hydroxide sol
(d) HCl

Question. The pH of which of the following samples cannot be found directly using pH paper?
(a) Lemon juice
(b) Dilute HCl
(c) Solid sodium bicarbonate
(d) Solution of a detergent.

Question. Which of the following natural sources contains oxalic acid?
(a) lemon
(b) orange
(c) tomato
(d) tamarind

Question. The acid found in an ant sting is
(a) acetic acid
(b) citric acid
(c) tartaric acid
(d) Methanoic acid

Question. To relieve pain caused due to acidity, we can take
(a) sour milk
(b) lemon juice
(c) orange juice
(d) milk of magnesia

Question. What are the products obtained when potassium sulphate reacts with barium iodide in an aqueous medium?
(a) KI and BaSO₄
(b) KI, Ba and SO₂
(c) K, I2 and BaSO₄
(d) K, Ba, I2 and SO₂

Question. Which of the following salts is basic in nature?
(a) NH4NO₃
(b) Na₂CO₃
(c) Na₂SO₄
(d) NaCl

Question. Which of the following salts has the minimum pH value?
(a) (NH₄)₂SO₄
(b) NaHCO₃
(c) K₂SO₄
(d) NaCl

Question. You are given four unknown solutions I, II, III, and IV. The pH values of these solutions are found to be 3, 7, 8, and 10 respectively. Among the given solutions, which solution has the highest hydrogen ion concentration?
(a) I
(b) II
(c) III
(d) IV

Question. Which one of the following is required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal?
(a) blue litmus paper
(b) red litmus paper
(c) a burning splinter
(d) lime water

Question. Zinc reacts with an acid as well as with a base to liberate hydrogen. On the basis of this what should be the nature of the zinc metal?
(a) Basic
(b) Acidic
(c) Amphoteric
(d) Neutral

Question. Which of the following indicators is an olfactory indicator?
(a) Litmus
(b) Vanilla
(c) Turmeric
(d) Phenolphthalein

Question. Which one is suitable method to find the accurate pH value?
(a) pH meter
(b) pH paper
(c) Universal indicator
(d) Litmus solution

Question. When you test the solutions of sodium bicarbonate, sodium hydroxide, hydrochloric acid and acetic acid with universal indicator, in which case would you get a red colour?
(a) Sodium bicarbonate
(b) Hydrochloric acid
(c) Sodium hydroxide
(d) Acetic acid

Question. The pH of a sample of pure water is 7 at room temperature. What is its pH when a pinch of solid sodium bicarbonate is dissolved in it?
(a) vary near to 7
(b) less than 7
(c) more than 7
(d) exactly 7

Question. Why is universal indicator a better one than litmus paper?
(a) Litmus paper can only be used for acids.
(b) Litmus paper can only be used for alkalis.
(c) Universal indicator goes green if something is neutral.
(d) Universal indicator is useful for all ranges of pH of the solution.

Question. Water soluble bases are known as?
(a) Neutral
(b) Base
(c) Acid
(d) Alkali

Fill in the Blanks :

Question. Anhydrous sodium carbonate is commonly known as …………… .  

Question. When an acid reacts with a metal carbonate or metal hydrogen carbonate, it gives the corresponding salt, ………. gas and …………… .  

Question. …………………….. is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form.  

Question. ENO contains ………. and is ……….. in nature.  

Question. Soda–acid fire extinguisher contains a solution of sodium hydrogen carbonate and …………… .  

True / False :

Question. Washing soda on strong heating gives sodium oxide and carbon dioxide.  

Question. Mixing concentrated acids or bases with water is a highly endothermic process.  

Question. Bleaching powder is used for disinfecting drinking water.  

Question. Acids and bases neutralise each other to form corresponding salts and water.  

Question. Plaster of paris is obtained by heating gypsum at 373 K in a kiln.