MCQ : Acid Base Salt | Chemistry class 10 science

 

Top 100 MCQS : Acid Base Salt

Top 101 MCQS : Acid Base Salt .  It is most important topic of NCERT  Acids bases salt  chapter 2  in Class 10.  Questions are frequently asked in the CBSE  board ,   ICSE Board and other competitive exam ( IIT JEE, NEET,  AIMS, State Engineering exam ) from “mcqs on acids, bases and salts multiple choice questions “.

Acids, bases and salts question bank will be very beneficial for the students who are engaged in the preparation of  upcoming board exam and other competitive exam .

Acids Bases and Salts class 10 MCQ online test

Q.1 . 10 ml of a solution of NaOH is found to be completely neutralised by 8ml of a given solution of HCl. If we take 20 ml of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be :

(a) 4 ml

(b) 8ml

(c)12 ml

(d) 16ml

 

Ans :  (d) 16ml

 

Q.2. Which of the following types of medicine is used for treating indigestion caused by over-eating?

(a) Antibiotic

(b) Analgesic

(c) Antacid

(d) Antiseptic

 

Ans:  (c) Antacid

 

Q.3. A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:

(a) Na₂SO₄

(b) CaSO₄

(c) H₂SO₄

(d) K₂SO₄

 

Ans:   (c) H₂SO₄

 

Q.4. One of the following is not an organic acid. This is:

(a) Ethanoic acid

(b) Formic acid

(c) Citric acid

(d) Carbonic acid

 

Ans :  (d) Carbonic acid

 

Q.5. The property which is not shown by acids is :

(a) They have sour taste

(b) They feel soapy

(c) They turns litmus paper

(d) Their pH is less than seven

 

Ans :  (b) They feel soapy

 

Q.6.The indicators which turns red in acid solution are:

(a) Turmeric and litmus

(b) Phenolphthalein and methyl orange

(c) Litmus and methyl orange

(d) Phenolphthalein and litmus

 

Ans :  (c) Litmus and methyl orange

 

Q.7. The discomfort caused by indigestion due to overeating can be cured by treating:

(a) Vinegar

(b) Lemon juice

(c) Baking soda

(d) Caustic soda

 

Ans :  (c) Baking soda

 

Q.8. The indicator which produces a pink colour in an alkaline solution:

(a) Methyl orange

(b) Turmeric paper

(c) Phenolphthalein

(d) Litmus paper

 

Ans : (c) Phenolphthalein

 

Q.9.  A solution reacts with zinc granules to give a gas which burns with a ‘pop’ sound. The solution contains:

(a) Mg(OH)₂

(b) Na₂CO₃

(c) NaCl

(d) HCl

 

Ans :  (d) HCl

 

Q.10. One of the following is a medicine for indigestion. This is:

(a) Sodium hydroxide

(b) Manganese dioxide

(c) Magnesium hydroxide

(d) Potassium hydroxide

 

Ans : (c) Magnesium hydroxide

 

Q.11. Bee sting contains:

(a) An acidic liquid

(b) A salt solution

(c) An alkaline liquid

(d) An alcohol

 

Ans :  (a) An acidic liquid

 

Q.12. Wasp sting contains:

(a) A sugar solution

(b) An acidic liquid

(c) A salt solution

(d) An alkaline liquid

 

Ans : (d) An alkaline liquid

 

Q.13.One of the following does not inject an acidic liquid into the skin through its sting. This is:

(a) Honey bee

(b) Ant

(c) Wasp

(d) Nettle leaf hair

 

Ans :  (c) Wasp

 

Q.14. A solution turns red litmus blue. Its pH is likely to be:

(a) 1

(b) 4

(c) 5

(d) 10

 

Ans : (d) 10

 

Q.15. A solution turns blue litmus red. Its pH is likely to be:

(a) 7

(b) 5

(c) 8

(d) 14

 

Ans :  (b) 5

 

Q. 16. A solution turns Phenolphthalein indicator pink. The most likely pH of the solution will be:

(a) 6

(b) 4

(c) 9

(d) 7

 

Ans : (c) 9

 

Q.17. The colour of methyl orange indicator in a solution is yellow. The pH of the solution is likely to be:

 

(a) 7

(b) Less than 7

(c) 0

(d) More than 7

 

Ans :  (d) More than 7

 

Q.18. Bee stings can be treated with:

(a) Vinegar

(b) Sodium hydrogen carbonate

(c) Potassium hydroxide

(d) Lemon juice

 

Ans : (b) Sodium hydrogen carbonate

 

Q.19. Wasp stings can be treated with:

(a) Baking soda

(b) Vinegar

(c) Washing soda

(d) Milk of magnesia

 

Ans:  (b) Vinegar

 

Q.20. It has been found that rubbing vinegar on the stung area of the skin of a person gives him relief. The person has been stung by:

(a) Wasp

(b) Ant

(c) Honey bee

(d) Nettle leaf hair

 

Ans :  (a) Wasp

 

 

Q. 21. Fresh milk has a pH of 6. When milk changes into curd, the pH value will:

(a) Become 7

(b) Become less than 6

(c) Become more than 7

(d) Remain unchanged

 

Ans :  (b) Become less than 6

 

Q.22. The acid produce naturally in our stomach is :

(a) Acetic acid

(b) Citric acid

(c) Hydrochloric acid

(d) Sulphuric acid

 

Ans :  (c) Hydrochloric acid

 

Q.23. The daffodil plant grow best in soil having a pH range of 6.0 to6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?

 (a) Salt

(b) Lime

(c) Sand

(d) Compost

 

Ans :  (b) Lime

 

Q. 24. The salt which will give an acidic solution on dissolving in water is:

(a) KCl

(b) NH₄Cl

(c) Na₂CO₃

(d) CH₃COONa

 

Ans :  (b) NH₄Cl

 

Q.25. One of the following salt will give an alkaline solution on dissolving in water. This is:

(a) Na₂CO₃

(b) Na₂SO₄

(c) NaCl

(d)(NH₄)₂SO₄

 

Ans :  (a) Na₂CO₃

 

Q.26. The salt which give a neutral solution on dissolving in water will be:

(a) CH₃COONa

(b) NH₄Cl

(c) KCl

(d) Na₂CO₃

 

Ans :  (c) KCl

 

Q.27. The products of chlor-alkali process are:

(a) NaCl, Cl₂ , and H₂

(b) Cl₂ , H₂ and NaOH

(c) Cl₂, Na₂CO₃ and H₂O

(d) NaOH, Cl₂ and HCl

 

Ans:  (b) Cl₂ , H₂ and NaOH

 

Q. 28. The number of molecules of water of crystallisation present in washing soda crystals is:

(a) Five

(b) Two

(c) Ten

(d) Seven

 

Ans:  (c) Ten

 

Q. 29. The salt whose aqueous solution will turn blue litmus to red is:

(a) Ammonium sulphate

(b) Sodium acetate

(c) Sodium chloride

(d) Potassium carbonate

 

Ans :  (a) Ammonium sulphate

 

Q.30.The aqueous solution of one of the following salt will turn red litmus to blue. This salt is:

(a) Potassium sulphate

(b) Sodium sulphate

(c) Sodium chloride

(d) Potassium carbonate

 

Ans:  (d) Potassium carbonate

 

Q.31. The salt whose aqueous solution will have no effect on either red litmus or blue litmus is

(a) Potassium sulphate

(b) Sodium carbonate

(c) Ammonium sulphate

(d) Sodium acetate

 

Ans:  (a) Potassium sulphate

 

Q.32. The aqueous solution of one of the following salt will turn phenolphthalein indicator pink. This salt is:

(a) KCl

(b) K₂SO₄

(c) K₂CO₃

(d) KNO₃

 

Ans:  (c) K₂CO₃

 

Q.33. The formula of baking soda is:

(a) K₂CO₃

(b) KHCO₃

(c) NaHCO₃

(d) KNO₃

 

Ans :  (c) NaHCO₃

 

Q.34. Which of the following is treated with chlorine to obtain bleaching powder?

(a) CaSO₄

(b) Ca(OH)₂

(c) Mg(OH)₂

(d) KOH

 

Ans:  (b) Ca(OH)₂

 

Q.35. Plaster of paris is prepared by heating one of the following to a temperature of 100℃. This is:

(a) CaSO₃.2H₂O

(b) CaCl₂.2H₂O

 (c) CaCO₃.2H₂O

(d) CaSO₄.2H2O

 

Ans :  (d) CaSO₄.2H2O

 

Q.36. A salt whose aqueous solution will have a pH of more than 7 will be:

(a) K₂CO₃

(b) K₂SO₄

(c) NaCl

(d) NH₄Cl

 

Ans : (a) K₂CO₃

 

Q.37. A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of the solution is less than 7, the salt is most likely to be:

(a) CH₃COONa

(b) Na₂CO₃

(c) KCl

(d) NH₄Cl

 

Ans :  (d) NH₄Cl

 

Q.38. Which one of the given is a mineral acid?

A. Lactic acid

B. Formic acid

C. Tartaric acid

D. Hydrochloric acid

 

Ans :  D. Hydrochloric acid

 

Q.39. Which one of the given is an organic acid?

A. Citric acid

B. Hydrochloric acid

C. Lactic acid

D. Both (1) & (3)

 

Ans:  D. Both (1) & (3)

 

 Q.40.  The chemical formula of caustic potash is

(a) NaOH    (b) Ca(OH)2    (c) NH4OH    (D) KOH

 

Ans :   (D) KOH

 

Q.41.  The difference of molecules of water in gypsum and POP is

(a) 5/2    (b) 2   (c) 3/2    (d) ½

 

Ans :   (c) 3/2   

 

Q.42. Which one of the given is incorrect?

A. Acids turns blue litmus paper red

B. Aqueous solutions of acids conduct electricity

C. Acids react with certain metals to form hydrogen gas

D. None of these

 

Ans :  D. None of these

 

Q.43. Which one of the given acids is used in the treatment of bone marrow and scurvy diseases?

A. Acetic acid

B. Hydrochloric acid

C. Ascorbic acid

D. Nitric acid

 

Ans : C. Ascorbic acid

 

 Q.44 . Acid present in apple is :

A. Oxalic acid

B. Malic acid

C. Acetic acid

D. Formic acid

 

Ans :  B. Malic acid

 

Q.45. Which one of the given is hydracid?

A. H₃PO₄

B. H₂SO₄

C. HCN

D. HNO₃

 

Ans : C. HCN

 

Q.46.  Most of the oxides of metals when react with acid, form____          

A. A base

B. An acid

C. A salt

D. Either (1) or (2)

 

Ans :   C.   A salt

 

Q.47. Generally, when certain metals react with an acid they release _______ gas.

A. Nitrogen

B. Oxygen

C. Hydrogen

D. Argon

 

Ans :    C. Hydrogen

 

 Q.48. Which one of the given is formed when sodium hydrogen carbonate reacts with hydrochloric acid?

A. Sodium chloride

B. Carbon dioxide

C. Water

D. All the these

 

Ans :   D. All the these

 

Q.49.  A strong acid:

A. Completely gets ionized in water

B. Partially gets ionized in water

C. Do not get ionized in water

D. All the these

 

Ans :   A. Completely gets ionized in water

 

Q.50.  Which of the following salts has no water of crystallization?

(a) Blue vitriol    (b) Washing soda    (c) Baking soda    (d) Gypsum

 

Ans :  (c) Baking soda   

 

Q.51.  The function of quick lime in soda lime mixture is to

(a) Absorb moisture present in soda lime

(b) Increase the efficiency of soda lime

(c) Increase the pH of soda lime

(d) Take part in reaction with NaOH

 

Ans:  (a) Absorb moisture present in soda lime

 

Q.52 . Which of the given is a strong base?

A. Calcium hydroxide

B. Magnesium hydroxide

C. Ammonium hydroxide

D. Potassium hydroxide

 

Ans:   D. Potassium hydroxide

 

Q.53. Which of the given is used as an antacid?

A. Sodium hydrocarbonate

B. Calcium hydroxide

C. Magnesium hydroxide

D. All the these

 

Ans :   C. Magnesium hydroxide

 

Q.54. Which one of the given is the pH value of pure water?

A. 0

B. 7

C. 8   

D. 1

 

Ans : B.  7

 

Q.55. Which one of the given is true, if a substance has a pH value of 4?

A. The substance is a base

B. The substance is an acid

C. The substance is a neutral substance

D. Either (1) or (2)

 

Ans :    B. The substance is an acid

 

Q.56. Which one of the given is true, if a substance has a pH value of 7?

A. The substance is a base

B. The substance is a acid

C. The substance is a neutral substance

D. Either (1) or (2)

 

Ans:    C. The substance is a neutral substance

 

Q.57. Which one of the given is commonly known as blue vitriol and is used as a fungicide?

A. Potassium nitrate

B. Copper sulphate

C. Sodium carbonate

D. Sodium chloride

 

Ans :   B. Copper sulphate

 

 Q.58. Which one of the following is formed when calcium hydroxide reacts with carbon dioxide?

A. Hydrogen gas

B. Water

C. Salt

D. Both B and C

 

Ans :    D. Both B and C

 

 Q.59. Which of the following phenomena occurs when acid is mixed with water

(a) Neutralization

(b) Dilution

(c) Ionization

A. Only (b) is correct

B. (a) & (b) are correct

C. (b) & (c) are correct

D. Only (c) is correct

 

Ans :    C. (b) & (c) are correct

 

Q.60.  The nature of calcium phosphate is present in tooth enamel is

(a) Basic    (b) Amphoteric    (c) Acidic    (d) Neutral

 

Ans :  (a) Basic   

 

Q.61. Which one among the given is a weak base?

A. Sodium hydroxide

B. Potassium hydroxide

C. Ammonium hydroxide

D. All the these

 

Ans :    C. Ammonium hydroxide

 

Q.62. Which acid is used in cola to give it a biting sharp taste

A. Sulphuric acid (H₂SO₄)

B. Tartaric acid

C. Phosphoric acid

D. Citric acid

 

Ans :   B. Tartaric acid

 

Q.63.  Range of pH scale is

A. 7 to 10

B. 0 to 10

C. 0 to 14

D. 7 to 14

 

Ans :    C.    0 to 14

 

 Q.64. Due to excess passing of CO₂ through an aqueous solution of slaked lime, its milkiness fades because          

A. Calcium carbonate is produced

B. Calcium bi-carbonate is produced

C. Calcium oxide is produced

D. Due to the production of more heat

 

Ans :      A. Calcium carbonate is produced

 

Q.65.  When acids dissolve in water it releases _

A. H⁺ ion

B. H^{- i}on

C. H₃O⁺ ion

D. H₃O²⁺ ion

 

Ans :    A.   H⁺ ion

 

Q.66.  Lime water is

(a) CaO    (b) Ca(OH)₂    (c) CaCO₃    (d) CaCI₂

 

Ans:    (b) Ca(OH)₂    

 

Q.67.  Farmers neutralise the effect of acidity of the soil by adding

(a) slaked lime

(b) gypsum

(c) caustic soda

(d) baking soda

 

Ans :  (a) slaked lime

 

Q.68. Which element is always present in Arrhenius acid?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. None of these

 

Ans :  C. Hydrogen

 

Q.69.  Methyl  orange indicator’s  colour in acidic medium is

A. Yellow

B. Pink

C. Red

D. Orange

 

Ans :   C. Red

 

Q.70. The chemical formula of Gypsum is

A. CaSO₄,1/2H₂O

B. CaSO₄,2H₂O

C. CaSO₄,H₂O

D. CaSO₄,3H₂O

 

Ans :   B. CaSO₄,2H₂O

 

 Q.71 . During the preparation of HCl gas on a humid day, the gas is usually passed through the guard tube containing CaCl₂. The purpose of using CaCl₂ is

A. To add moisture to the gas (HCl)

B. To absorb HCl gas

C. To absorb moisture from HCl gas

D. To Use it as a catalyst

 

Ans :  C. To absorb moisture from HCl gas

 

Q.72. Which one is different from others

A. Nitric acid

B. Sulphuric acid

C. Tartaric acid

D. Phosphoric acid

 

 Ans :   C. Tartaric acid

 

Q.73. One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is

(a) hydrochloric acid

(b) tartaric acid

(c) acetic acid

(d) sulphuric acid

 

Ans : (b) tartaric acid

 

Q.74.  Soda ash chemical formula is

A. NaHCO₃

B. Na₂CO₃, 9H₂O

C. Na₂CO₃

D. Na₂CO₃,10H₂O

 

Ans :  C. Na₂CO₃

 

Q.75. Common salt beside being used in the kitchen can also be used as the raw material for the production of

(a) Baking powder

(b) Washing soda                                        

(c) Black ash                                    

(d) Slaked lime        

A. (B) and (C)

B. (A) and (C)

C. (A) and (B)

D. (B) and (D)

          

Ans :   C. (A) and (B)

                      

Q.76.  Level of pH found in antacid solution

A. ≤6.5

B. ≥7.0

C. >10

D. >14

 

Ans :  C. >10

 

Q.77. If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

(a) Wash the hand with saline solution.

(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.

(c) After washing with plenty of water and apply solution of sodium hydroxide on the hand.

(d) Neutralise the acid with a strong alkali.

 

Ans :  (b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate

 

Q.78.  Black ash is

A. Dry KOH

B. Barium sulphide

C. Charcoal   

D. Hydrated KOH

Ans :  B. Barium sulphide

 Q.79. When electricity passes through NaCl aqueous solution

A. Sodium metal is deposited

B. Only Chlorine gas is produced

C. Chlorine & Hydrogen gases are produced

D. All of the given are produced

 

Ans :  D. All of the given are produced

 

 

Q.80 . Identify the element

(a) It is a white translucent solid                                       

(b) It readily reacts with water and produces an alkaline solution                                            

(c) It is stored in kerosene

A. Na

B. Ca

C. Al

D. P

 

Ans : A.  Na

 

Q.81. What is the pH value of sodium chloride?

(a) 7

(b) More than 7

(c) Less than 7

(d)Zero

 

Ans :   (a) 7

 

Q.82. What is the pH value of distilled water?

(a) 7

(b) More than 7

(c) Less than 7

(d)Zero

 

Ans :  (a) 7

                                              

Q.83. Bleaching powder’s chemical name is ______

A. Calcium hypo-Oxychloride

B. Calcium Oxychloride

C. Calcium Chloride

D. Calcium Chloro-Oxide

 

Ans :   B. Calcium Oxychloride

 

Q.84. What happens when a base is added to vanilla?

(a) Color of vanilla changes into red

(b) Vanilla becomes colorless

(c) Vanilla loses its smell

(d) Nothing happens

 

Ans : (c) Vanilla loses its smell

 

Q.85. Which among the following is not a base ?

(a) NaOH

(b) Mg(OH)₂

(c) NH₄OH

(d) C₂H₅OH

 

Ans :   (d) C₂H₅OH

 

Q.86. The colour of Methyl  orange in basic medium is

A. Pink

B. Orange

C. Purple

D. Yellow

 

Ans :   D. Yellow

 

Q.87. The pH of commonly used toothpaste is

A. <6.5

B. > 7.0

C. ≥2.2

D. None of these

 

Ans :  B. > 7.0

 

Q.88.  Phenolphthalein’s colour in basic medium is ____but in acid it is ______.

A. Pink, Colorless

B. Yellow, Pink

C. Pink, Orange

D. Blue, Red

 

Ans  :   A. Pink, Colorless

 

Q.89. When sodium hydroxide reacts with Zinc it produces ______       

A. Sodium oxide and water

B. Sodium zincates and water

C. Sodium zincates and hydrogen

D. Sodium oxide and hydrogen

 

 Ans:  B. Sodium zincates and water

 

Q.90. You are given 3 unknown solutions with pH value as 6,  8 & 9.5 respectively. Which solution will contain maximum OH⁻ ion?

A. Solution sample-1

B. Solution sample-2

C. Solution sample-3

D. Data are insufficient

 

Ans :  C. Solution sample-3

 

Q.91. The pH of Gastric juice is

A. <6.5

B. ≥7.0

C. 5

D. None of these

 

Ans :    C. 5

 

Q.92. The chemical formula of Plaster of Paris is  

A. CaSO₄. 1/2H₂O

B. CaSO₄, 2H₂O

C. CaSO₄, H₂O

D. CaSO₄, 3H₂O

 

Ans :   A. CaSO₄. 1/2H₂O

 

Q.93. Ammonium sulphate salt is

A. Basic salt

B. Acidic salt

D. Neutral salt

D. Complex salt

 

Ans :   B. Acidic salt

 

Q.94. Which of the following acid(s) never forms acidic salt?     

(a) HCl                                              

(b) H₃PO₄                                       

(c) H₂SO₄                                       

(d) H₂CO₃

A. (A) only

B. (D) only

C. (A) and (D) both

D. (A) and (C) both

 

Ans :   B. (D) only

 

                                              

Q.95. Vinegar is used in pickling as it

A. Is an acid

B. Prevents the growth of microbes

C. Prevents drying of a pickle

D. Increases taste

 

Ans :   B. Prevents the growth of microbes

 

Q.96.  Butyric acid is found in

A. Rancid butter

B. Rancid cake

C. Stings of bees

D. All of these

 

Ans :    B. Rancid cake

 

 Q.97.  An indicator is one kind of the following compound

A. Strong acid only

B. Reducing agent

C. Weak base or acid only

D. Complex salt

 

Ans :    C. Weak base or acid only

   

Q. 98.  The Normal Ph Of Human Blood Is?

A. 6.4

B. 7.0

C. 7.4

D. 7.5

 

Ans :  C.   7.4

 

Q.99. Rain is called acid rain when its:

(a) pH falls below 7

(b) pH falls below 6

(c) pH falls below 5.6

(d) pH is above 7

 

Ans: (c) pH falls below 5.6

 

Q. 100. When copper oxide and dilute hydrochloric acid react, colour changes to

(a) white

(b) bluish-green

(c) blue-black

(d) black

 

Ans : (b) bluish-green

 

Q.101.  Egg shell and marble are made up of

(a) CaCO₃

(b) CaO 

(c) Ca(OH)₂

(d) CaCl₂

 

Ans : (a) CaCO₃